{"content_id":"dqrzm1l047","slug":"ckd-diet-restriction-malnutrition-sarcopenia","locale":"en","schema_type":"Article","category":"knowledge_base","category_name":"Knowledge Base","title":"Misconceptions About Dietary Restrictions for Kidney Disease: Why Eating Right Matters More Than Eating Less","summary":"Indiscriminately cutting back on all foods and protein because of chronic kidney disease can increase the risks of malnutrition, muscle loss, and frailty. Dietary adjustments should be based on kidney function, dialysis status, blood test results, weight, and muscle condition, with only the necessary nutrients restricted.","sponsorship_disclosure":null,"author":{"name":"Injoys Editorial Team","url":"https://injoys.com/ko/about"},"key_points":["A chronic kidney disease diet should not indiscriminately reduce overall food intake; it should provide sufficient energy while adjusting only the necessary nutrients.","Insufficient calorie and protein intake can cause the body to use muscle as an energy source, increasing the risks of sarcopenia and protein-energy wasting.","Protein restriction for people with chronic kidney disease who are not on dialysis and protein supplementation for dialysis patients require different approaches, so the same diet should not be applied to both.","Potassium and phosphorus should not be uniformly restricted for all patients but adjusted based on blood test results, medications, bowel habits, and food sources.","If weight loss, reduced appetite, decreased muscle strength, or reduced food intake persists, an evaluation by a nephrologist and clinical nutrition specialist is necessary."],"content_markdown":"Dietary management is important for patients with chronic kidney disease, but this should not be interpreted simply as “eating as little as possible.” Excessive restriction can prevent adequate intake of calories and essential nutrients, leading to muscle loss, reduced physical function, vulnerability to infection, and frailty.\n\nConversely, this does not mean that protein or sodium can be consumed without restriction. The key is to **distinguish between what should be restricted and what should be consumed adequately** according to the stage of kidney function, dialysis status, blood test results, comorbidities, and nutritional status.\n\n## Key Conclusion: What Is Restricted Matters More Than the Overall Amount of Food\n\nA chronic kidney disease diet has two distinct goals.\n\n1. Adjust sodium, protein, and other nutrients within the necessary range to reduce the burden on the kidneys and metabolic abnormalities.\n2. Provide sufficient energy and nutrients to maintain body weight, muscle, and physical activity.\n\nFocusing on only one goal can cause problems. Excessively reducing the types and amounts of food can lead to insufficient calorie intake, causing even the protein consumed to be used as an energy source. Conversely, indiscriminate consumption of high-protein meals, salty foods, and processed foods can make kidney disease more difficult to manage in some patients.\n\nTherefore, the term **individualized balanced diet** is closer to the actual principle than “restrictive diet.”\n\n## Why Eating Less Leads to Muscle Loss\n\n### When Calories Are Insufficient, the Body Breaks Down Stored Tissue\n\nWhen food does not provide enough energy, the body breaks down not only fat but also muscle protein to obtain energy and amino acids. If protein intake has also been reduced, it becomes even more difficult to replace these losses.\n\nIn chronic kidney disease, the following factors can further accelerate muscle loss:\n\n- Poor appetite, nausea, or changes in taste\n- Inflammation and infection\n- Metabolic acidosis\n- Reduced physical activity\n- Comorbidities such as diabetes or cardiovascular disease\n- Nutrient losses and metabolic burden during dialysis\n- Overly complex dietary restrictions\n\n### Protein-Energy Wasting Is Not Simply Being Underweight\n\n“Protein-energy wasting,” as used in kidney disease, refers to a state in which the body’s stores of protein and energy have decreased. It is assessed comprehensively based not only on weight loss but also on loss of muscle mass, reduced food intake, low body mass index, and certain blood markers.\n\nWhen edema is present, fluid can make body weight appear stable or increased even while muscle is being lost. Therefore, nutritional status should not be assumed to be adequate based on the number on the scale alone.\n\n## Protein Restriction Is Not the Same Prescription for Everyone\n\nInternational guidelines generally recommend that patients with chronic kidney disease who are not on dialysis avoid excessive high-protein intake. The KDIGO 2024 guideline suggests a protein intake of approximately 0.8g per kilogram of body weight per day for adults with stage 3–5 chronic kidney disease and advises adults at risk of progression to avoid high protein intake exceeding 1.3g per kilogram per day.\n\nHowever, these numbers are not an individual prescription. Actual requirements vary depending on age, body size, nutritional status, diabetes, inflammation, physical activity, pregnancy status, and dialysis status. In people with obesity or edema, current body weight may not be used directly in the calculation.\n\n### When a Low-Protein Diet May Be Appropriate\n\nFor some metabolically stable patients who are not on dialysis, a lower-protein diet may be used under the supervision of medical and nutrition professionals. In this case, sufficient calories must be ensured, and nutritional status and blood test results must be continuously monitored. A patient arbitrarily reducing both rice and side dishes is not the same as following a guideline-based low-protein diet.\n\n### Conditions Change After Dialysis Begins\n\nDuring hemodialysis or peritoneal dialysis, protein loss and catabolism may occur, so protein requirements are generally higher than for patients who are not on dialysis. Continuing the same low-protein diet followed before dialysis may result in insufficient intake, so the diet must be readjusted according to the prescription from the dialysis center.\n\n## What Should Be Adjusted for Each Nutrient?\n\n| Item | Basic principle | Problems caused by excessive restriction | Why individualization is needed |\n|---|---|---|---|\n| Total calories | Ensure enough to maintain weight and muscle | May cause weight loss, muscle breakdown, fatigue, and frailty | Age, activity level, body size, and weight goals differ |\n| Protein | Patients not on dialysis should avoid excess and meet the prescribed amount | Excessive restriction can reduce muscle and physical function | Stage of kidney disease, nutritional status, and dialysis status are important |\n| Sodium | Reducing salty foods and processed foods is generally recommended | If food becomes too unpalatable, overall intake may decrease | Blood pressure, edema, heart failure, and medications must be considered together |\n| Potassium | Adjust food sources when blood potassium is high or there is a risk of it rising | Unnecessary restriction reduces intake of fruits, vegetables, and dietary fiber | Medications, acidosis, constipation, blood glucose, and residual kidney function also have an effect |\n| Phosphorus | Adjust according to blood phosphorus levels and food sources | Avoiding all protein foods can cause nutritional deficiencies | Phosphate additives and animal- and plant-based sources have different absorption rates |\n| Fluids | Follow the target amount when fluid restriction is prescribed by the medical team | Unnecessary restriction can increase the risk of dehydration | Requirements vary according to urine output, edema, heart failure, and dialysis method |\n\nDaily energy requirements in nutrition guidelines are often individualized within a range of approximately 25–35kcal per kilogram of body weight, but this is not a prescription for self-calculation. Requirements vary according to age, activity level, weight changes, and disease status, and a professional must also determine which body weight should be used for the calculation.\n\n## Why Potassium and Phosphorus Should Not Be Avoided Unconditionally\n\n### Potassium Should Be Assessed Alongside Test Results and Causes\n\nReduced kidney function can make potassium excretion more difficult, but not every patient with chronic kidney disease develops hyperkalemia. Blood potassium can also be affected by certain blood pressure medications, metabolic acidosis, constipation, blood glucose control, and errors during the testing process.\n\nIf test results are normal, broadly eliminating fruits and vegetables can lead to inadequate dietary fiber and vitamin intake and reduced dietary variety. If potassium is high, the actual sources should first be identified, followed by adjustments to food types, amounts, and cooking methods.\n\n### For Phosphorus, the Absorbed Form Matters as Well as the Amount\n\nProcessed meats, processed cheese, instant foods, and some beverages may contain phosphate additives. Phosphorus in additive form is absorbed relatively well. Phosphorus in plant-based foods is present in the form of phytate and tends to have a lower absorption rate.\n\nTherefore, rather than eliminating all protein foods to reduce phosphorus, it is necessary to check ingredient lists for phosphate additives and compare both nutritional value and absorption rates.\n\n## Differences According to the Stage of Kidney Function and Dialysis Status\n\n| Situation | Focus of dietary management |\n|---|---|\n| Early-stage chronic kidney disease | Manage blood pressure and blood glucose, limit excess sodium, and maintain a balanced diet and appropriate weight |\n| Advanced chronic kidney disease without dialysis | Prevent excess protein intake, ensure adequate calories, and monitor potassium, phosphorus, acidosis, and nutritional status |\n| Hemodialysis | Ensure adequate protein, manage weight gain between dialysis sessions and sodium and fluid intake, and control potassium and phosphorus |\n| Peritoneal dialysis | Replace protein losses and consider glucose absorbed from dialysis fluid, body weight, and blood glucose |\n| Older or frail patients | Prioritize preserving muscle and function while assessing both the benefits of restriction and the risk of nutritional loss |\n\nEven with the same “kidney disease diet,” the goals change as the stage changes. It is not safe to follow an online diet plan without checking kidney function and dialysis status.\n\n## How to Review the Actual Diet\n\n### 1. First, Record Current Intake and Weight Changes\n\nRecord all food and beverages consumed, meal portions, and appetite for about 3 days. Also review weight changes over the past 1–6 months, while distinguishing whether edema or fluid changes before and after dialysis are involved.\n\n### 2. Separate Foods That Should Be Reduced From Foods That Should Be Maintained\n\nRather than reducing the entire diet at once, identify priorities for adjustment, such as salty broths, ultra-processed foods, high-protein supplements, and phosphate additives. Unconditionally reducing rice or other energy sources can lead to insufficient calorie intake.\n\n### 3. Consider Blood Test Results Together With Comorbidities\n\nReview potassium, bicarbonate, phosphorus, blood glucose, lipid levels, and other results with the medical team, in addition to glomerular filtration rate and albuminuria. Rather than imposing long-term restrictions based on a single result, check trends and underlying causes.\n\n### 4. Monitor Muscle Function Along With Body Weight\n\nCheck whether walking has become slower than usual, standing up from a chair has become difficult, or climbing stairs has become harder. Healthcare facilities may use grip strength, walking speed, body composition, and nutritional assessments.\n\n### 5. Readjust the Prescription Regularly\n\nKidney function, medications, dialysis status, and appetite change over time. Rather than continuing a diet prescribed at an earlier stage, the level of restriction should be reassessed according to test results and nutritional status.\n\n## An Easily Overlooked Problem: The Complexity of Restrictions Can Itself Be Risky\n\nIf a patient separately follows instructions such as “no meat,” “no vegetables because of potassium,” “no dairy products or beans because of phosphorus,” and “no rice because of blood sugar,” there may be almost nothing left that the patient can actually eat. This can be viewed as the burden of dietary restrictions.\n\nSafe counseling prioritizes the following steps instead of continuing to expand the list of prohibited foods.\n\n1. First manage potentially life-threatening hyperkalemia or severe fluid overload.\n2. Identify clear sources of excess intake, such as sodium, added phosphorus, and excessive protein.\n3. Suggest foods that can replace calories and essential nutrients at the same time.\n4. Regularly compare the benefits of restriction with the risks of weight and muscle loss.\n\nInstructions about “what not to eat” should always be accompanied by guidance on “what to eat instead and how much.”\n\n## Can Kidney Function Recover Through Diet?\n\nAcute kidney injury can substantially improve when its cause is treated, but structural damage caused by chronic kidney disease often cannot be completely reversed. A healthy diet or exercise should not be presented as a specific treatment that will necessarily regenerate the kidneys.\n\nHowever, managing blood pressure and blood glucose while combining appropriate medications with diet and exercise may reduce albuminuria or slow the decline in kidney function. A realistic goal for patients is not the “complete cure” of a single test result, but slowing progression, preventing complications, and maintaining physical function.\n\n## Signs That Should Be Reported Promptly to the Medical Team\n\nIf any of the following changes occur, it is best not to dismiss them as a simple appetite problem and to inform a nephrologist or clinical nutrition professional.\n\n- Unintentional weight loss continues.\n- There are consecutive days when only about half of the usual amount of food can be eaten.\n- Nausea, vomiting, severe changes in taste, or difficulty swallowing occurs.\n- Walking or climbing stairs suddenly becomes difficult, or muscle strength clearly declines.\n- Edema or shortness of breath worsens, and weight changes rapidly.\n- Severe lethargy, palpitations, or a feeling of muscle paralysis occurs.\n\nSevere difficulty breathing, chest pain, changes in consciousness, or a sudden feeling of paralysis may require emergency evaluation.\n\n## Summary\n\nFor patients with chronic kidney disease, the danger is not restriction itself but **excessive restriction without evidence or a replacement plan**. During the non-dialysis stage, excess protein intake should be avoided, but sufficient calories and nutrients must be ensured; once dialysis begins, protein requirements change. Potassium and phosphorus should also be adjusted only after reviewing blood test results and actual food sources.\n\nProtecting the kidneys and protecting muscle are not opposing goals. By assessing test results, current intake, weight changes, and physical function together, both goals can be pursued at the same time.","content_html":"\u003cp\u003eDietary management is important for patients with chronic kidney disease, but this should not be interpreted simply as “eating as little as possible.” Excessive restriction can prevent adequate intake of calories and essential nutrients, leading to muscle loss, reduced physical function, vulnerability to infection, and frailty.\u003c/p\u003e\n\u003cp\u003eConversely, this does not mean that protein or sodium can be consumed without restriction. The key is to \u003cstrong\u003edistinguish between what should be restricted and what should be consumed adequately\u003c/strong\u003e according to the stage of kidney function, dialysis status, blood test results, comorbidities, and nutritional status.\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#key-conclusion-what-is-restricted-matters-more-than-the-overall-amount-of-food\" class=\"anchor\" id=\"key-conclusion-what-is-restricted-matters-more-than-the-overall-amount-of-food\"\u003e\u003c/a\u003eKey Conclusion: What Is Restricted Matters More Than the Overall Amount of Food\u003c/h2\u003e\n\u003cp\u003eA chronic kidney disease diet has two distinct goals.\u003c/p\u003e\n\u003col\u003e\n\u003cli\u003eAdjust sodium, protein, and other nutrients within the necessary range to reduce the burden on the kidneys and metabolic abnormalities.\u003c/li\u003e\n\u003cli\u003eProvide sufficient energy and nutrients to maintain body weight, muscle, and physical activity.\u003c/li\u003e\n\u003c/ol\u003e\n\u003cp\u003eFocusing on only one goal can cause problems. Excessively reducing the types and amounts of food can lead to insufficient calorie intake, causing even the protein consumed to be used as an energy source. Conversely, indiscriminate consumption of high-protein meals, salty foods, and processed foods can make kidney disease more difficult to manage in some patients.\u003c/p\u003e\n\u003cp\u003eTherefore, the term \u003cstrong\u003eindividualized balanced diet\u003c/strong\u003e is closer to the actual principle than “restrictive diet.”\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#why-eating-less-leads-to-muscle-loss\" class=\"anchor\" id=\"why-eating-less-leads-to-muscle-loss\"\u003e\u003c/a\u003eWhy Eating Less Leads to Muscle Loss\u003c/h2\u003e\n\u003ch3\u003e\n\u003ca href=\"#when-calories-are-insufficient-the-body-breaks-down-stored-tissue\" class=\"anchor\" id=\"when-calories-are-insufficient-the-body-breaks-down-stored-tissue\"\u003e\u003c/a\u003eWhen Calories Are Insufficient, the Body Breaks Down Stored Tissue\u003c/h3\u003e\n\u003cp\u003eWhen food does not provide enough energy, the body breaks down not only fat but also muscle protein to obtain energy and amino acids. If protein intake has also been reduced, it becomes even more difficult to replace these losses.\u003c/p\u003e\n\u003cp\u003eIn chronic kidney disease, the following factors can further accelerate muscle loss:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003ePoor appetite, nausea, or changes in taste\u003c/li\u003e\n\u003cli\u003eInflammation and infection\u003c/li\u003e\n\u003cli\u003eMetabolic acidosis\u003c/li\u003e\n\u003cli\u003eReduced physical activity\u003c/li\u003e\n\u003cli\u003eComorbidities such as diabetes or cardiovascular disease\u003c/li\u003e\n\u003cli\u003eNutrient losses and metabolic burden during dialysis\u003c/li\u003e\n\u003cli\u003eOverly complex dietary restrictions\u003c/li\u003e\n\u003c/ul\u003e\n\u003ch3\u003e\n\u003ca href=\"#protein-energy-wasting-is-not-simply-being-underweight\" class=\"anchor\" id=\"protein-energy-wasting-is-not-simply-being-underweight\"\u003e\u003c/a\u003eProtein-Energy Wasting Is Not Simply Being Underweight\u003c/h3\u003e\n\u003cp\u003e“Protein-energy wasting,” as used in kidney disease, refers to a state in which the body’s stores of protein and energy have decreased. It is assessed comprehensively based not only on weight loss but also on loss of muscle mass, reduced food intake, low body mass index, and certain blood markers.\u003c/p\u003e\n\u003cp\u003eWhen edema is present, fluid can make body weight appear stable or increased even while muscle is being lost. Therefore, nutritional status should not be assumed to be adequate based on the number on the scale alone.\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#protein-restriction-is-not-the-same-prescription-for-everyone\" class=\"anchor\" id=\"protein-restriction-is-not-the-same-prescription-for-everyone\"\u003e\u003c/a\u003eProtein Restriction Is Not the Same Prescription for Everyone\u003c/h2\u003e\n\u003cp\u003eInternational guidelines generally recommend that patients with chronic kidney disease who are not on dialysis avoid excessive high-protein intake. The KDIGO 2024 guideline suggests a protein intake of approximately 0.8g per kilogram of body weight per day for adults with stage 3–5 chronic kidney disease and advises adults at risk of progression to avoid high protein intake exceeding 1.3g per kilogram per day.\u003c/p\u003e\n\u003cp\u003eHowever, these numbers are not an individual prescription. Actual requirements vary depending on age, body size, nutritional status, diabetes, inflammation, physical activity, pregnancy status, and dialysis status. In people with obesity or edema, current body weight may not be used directly in the calculation.\u003c/p\u003e\n\u003ch3\u003e\n\u003ca href=\"#when-a-low-protein-diet-may-be-appropriate\" class=\"anchor\" id=\"when-a-low-protein-diet-may-be-appropriate\"\u003e\u003c/a\u003eWhen a Low-Protein Diet May Be Appropriate\u003c/h3\u003e\n\u003cp\u003eFor some metabolically stable patients who are not on dialysis, a lower-protein diet may be used under the supervision of medical and nutrition professionals. In this case, sufficient calories must be ensured, and nutritional status and blood test results must be continuously monitored. A patient arbitrarily reducing both rice and side dishes is not the same as following a guideline-based low-protein diet.\u003c/p\u003e\n\u003ch3\u003e\n\u003ca href=\"#conditions-change-after-dialysis-begins\" class=\"anchor\" id=\"conditions-change-after-dialysis-begins\"\u003e\u003c/a\u003eConditions Change After Dialysis Begins\u003c/h3\u003e\n\u003cp\u003eDuring hemodialysis or peritoneal dialysis, protein loss and catabolism may occur, so protein requirements are generally higher than for patients who are not on dialysis. Continuing the same low-protein diet followed before dialysis may result in insufficient intake, so the diet must be readjusted according to the prescription from the dialysis center.\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#what-should-be-adjusted-for-each-nutrient\" class=\"anchor\" id=\"what-should-be-adjusted-for-each-nutrient\"\u003e\u003c/a\u003eWhat Should Be Adjusted for Each Nutrient?\u003c/h2\u003e\n\u003cdiv class=\"overflow-x-auto\"\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eItem\u003c/th\u003e\n\u003cth\u003eBasic principle\u003c/th\u003e\n\u003cth\u003eProblems caused by excessive restriction\u003c/th\u003e\n\u003cth\u003eWhy individualization is needed\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Item\"\u003eTotal calories\u003c/td\u003e\n\u003ctd data-label=\"Basic principle\"\u003eEnsure enough to maintain weight and muscle\u003c/td\u003e\n\u003ctd data-label=\"Problems caused by excessive restriction\"\u003eMay cause weight loss, muscle breakdown, fatigue, and frailty\u003c/td\u003e\n\u003ctd data-label=\"Why individualization is needed\"\u003eAge, activity level, body size, and weight goals differ\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Item\"\u003eProtein\u003c/td\u003e\n\u003ctd data-label=\"Basic principle\"\u003ePatients not on dialysis should avoid excess and meet the prescribed amount\u003c/td\u003e\n\u003ctd data-label=\"Problems caused by excessive restriction\"\u003eExcessive restriction can reduce muscle and physical function\u003c/td\u003e\n\u003ctd data-label=\"Why individualization is needed\"\u003eStage of kidney disease, nutritional status, and dialysis status are important\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Item\"\u003eSodium\u003c/td\u003e\n\u003ctd data-label=\"Basic principle\"\u003eReducing salty foods and processed foods is generally recommended\u003c/td\u003e\n\u003ctd data-label=\"Problems caused by excessive restriction\"\u003eIf food becomes too unpalatable, overall intake may decrease\u003c/td\u003e\n\u003ctd data-label=\"Why individualization is needed\"\u003eBlood pressure, edema, heart failure, and medications must be considered together\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Item\"\u003ePotassium\u003c/td\u003e\n\u003ctd data-label=\"Basic principle\"\u003eAdjust food sources when blood potassium is high or there is a risk of it rising\u003c/td\u003e\n\u003ctd data-label=\"Problems caused by excessive restriction\"\u003eUnnecessary restriction reduces intake of fruits, vegetables, and dietary fiber\u003c/td\u003e\n\u003ctd data-label=\"Why individualization is needed\"\u003eMedications, acidosis, constipation, blood glucose, and residual kidney function also have an effect\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Item\"\u003ePhosphorus\u003c/td\u003e\n\u003ctd data-label=\"Basic principle\"\u003eAdjust according to blood phosphorus levels and food sources\u003c/td\u003e\n\u003ctd data-label=\"Problems caused by excessive restriction\"\u003eAvoiding all protein foods can cause nutritional deficiencies\u003c/td\u003e\n\u003ctd data-label=\"Why individualization is needed\"\u003ePhosphate additives and animal- and plant-based sources have different absorption rates\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Item\"\u003eFluids\u003c/td\u003e\n\u003ctd data-label=\"Basic principle\"\u003eFollow the target amount when fluid restriction is prescribed by the medical team\u003c/td\u003e\n\u003ctd data-label=\"Problems caused by excessive restriction\"\u003eUnnecessary restriction can increase the risk of dehydration\u003c/td\u003e\n\u003ctd data-label=\"Why individualization is needed\"\u003eRequirements vary according to urine output, edema, heart failure, and dialysis method\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/div\u003e\n\u003cp\u003eDaily energy requirements in nutrition guidelines are often individualized within a range of approximately 25–35kcal per kilogram of body weight, but this is not a prescription for self-calculation. Requirements vary according to age, activity level, weight changes, and disease status, and a professional must also determine which body weight should be used for the calculation.\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#why-potassium-and-phosphorus-should-not-be-avoided-unconditionally\" class=\"anchor\" id=\"why-potassium-and-phosphorus-should-not-be-avoided-unconditionally\"\u003e\u003c/a\u003eWhy Potassium and Phosphorus Should Not Be Avoided Unconditionally\u003c/h2\u003e\n\u003ch3\u003e\n\u003ca href=\"#potassium-should-be-assessed-alongside-test-results-and-causes\" class=\"anchor\" id=\"potassium-should-be-assessed-alongside-test-results-and-causes\"\u003e\u003c/a\u003ePotassium Should Be Assessed Alongside Test Results and Causes\u003c/h3\u003e\n\u003cp\u003eReduced kidney function can make potassium excretion more difficult, but not every patient with chronic kidney disease develops hyperkalemia. Blood potassium can also be affected by certain blood pressure medications, metabolic acidosis, constipation, blood glucose control, and errors during the testing process.\u003c/p\u003e\n\u003cp\u003eIf test results are normal, broadly eliminating fruits and vegetables can lead to inadequate dietary fiber and vitamin intake and reduced dietary variety. If potassium is high, the actual sources should first be identified, followed by adjustments to food types, amounts, and cooking methods.\u003c/p\u003e\n\u003ch3\u003e\n\u003ca href=\"#for-phosphorus-the-absorbed-form-matters-as-well-as-the-amount\" class=\"anchor\" id=\"for-phosphorus-the-absorbed-form-matters-as-well-as-the-amount\"\u003e\u003c/a\u003eFor Phosphorus, the Absorbed Form Matters as Well as the Amount\u003c/h3\u003e\n\u003cp\u003eProcessed meats, processed cheese, instant foods, and some beverages may contain phosphate additives. Phosphorus in additive form is absorbed relatively well. Phosphorus in plant-based foods is present in the form of phytate and tends to have a lower absorption rate.\u003c/p\u003e\n\u003cp\u003eTherefore, rather than eliminating all protein foods to reduce phosphorus, it is necessary to check ingredient lists for phosphate additives and compare both nutritional value and absorption rates.\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#differences-according-to-the-stage-of-kidney-function-and-dialysis-status\" class=\"anchor\" id=\"differences-according-to-the-stage-of-kidney-function-and-dialysis-status\"\u003e\u003c/a\u003eDifferences According to the Stage of Kidney Function and Dialysis Status\u003c/h2\u003e\n\u003cdiv class=\"overflow-x-auto\"\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSituation\u003c/th\u003e\n\u003cth\u003eFocus of dietary management\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Situation\"\u003eEarly-stage chronic kidney disease\u003c/td\u003e\n\u003ctd data-label=\"Focus of dietary management\"\u003eManage blood pressure and blood glucose, limit excess sodium, and maintain a balanced diet and appropriate weight\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Situation\"\u003eAdvanced chronic kidney disease without dialysis\u003c/td\u003e\n\u003ctd data-label=\"Focus of dietary management\"\u003ePrevent excess protein intake, ensure adequate calories, and monitor potassium, phosphorus, acidosis, and nutritional status\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Situation\"\u003eHemodialysis\u003c/td\u003e\n\u003ctd data-label=\"Focus of dietary management\"\u003eEnsure adequate protein, manage weight gain between dialysis sessions and sodium and fluid intake, and control potassium and phosphorus\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Situation\"\u003ePeritoneal dialysis\u003c/td\u003e\n\u003ctd data-label=\"Focus of dietary management\"\u003eReplace protein losses and consider glucose absorbed from dialysis fluid, body weight, and blood glucose\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Situation\"\u003eOlder or frail patients\u003c/td\u003e\n\u003ctd data-label=\"Focus of dietary management\"\u003ePrioritize preserving muscle and function while assessing both the benefits of restriction and the risk of nutritional loss\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/div\u003e\n\u003cp\u003eEven with the same “kidney disease diet,” the goals change as the stage changes. It is not safe to follow an online diet plan without checking kidney function and dialysis status.\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#how-to-review-the-actual-diet\" class=\"anchor\" id=\"how-to-review-the-actual-diet\"\u003e\u003c/a\u003eHow to Review the Actual Diet\u003c/h2\u003e\n\u003ch3\u003e\n\u003ca href=\"#1-first-record-current-intake-and-weight-changes\" class=\"anchor\" id=\"1-first-record-current-intake-and-weight-changes\"\u003e\u003c/a\u003e1. First, Record Current Intake and Weight Changes\u003c/h3\u003e\n\u003cp\u003eRecord all food and beverages consumed, meal portions, and appetite for about 3 days. Also review weight changes over the past 1–6 months, while distinguishing whether edema or fluid changes before and after dialysis are involved.\u003c/p\u003e\n\u003ch3\u003e\n\u003ca href=\"#2-separate-foods-that-should-be-reduced-from-foods-that-should-be-maintained\" class=\"anchor\" id=\"2-separate-foods-that-should-be-reduced-from-foods-that-should-be-maintained\"\u003e\u003c/a\u003e2. Separate Foods That Should Be Reduced From Foods That Should Be Maintained\u003c/h3\u003e\n\u003cp\u003eRather than reducing the entire diet at once, identify priorities for adjustment, such as salty broths, ultra-processed foods, high-protein supplements, and phosphate additives. Unconditionally reducing rice or other energy sources can lead to insufficient calorie intake.\u003c/p\u003e\n\u003ch3\u003e\n\u003ca href=\"#3-consider-blood-test-results-together-with-comorbidities\" class=\"anchor\" id=\"3-consider-blood-test-results-together-with-comorbidities\"\u003e\u003c/a\u003e3. Consider Blood Test Results Together With Comorbidities\u003c/h3\u003e\n\u003cp\u003eReview potassium, bicarbonate, phosphorus, blood glucose, lipid levels, and other results with the medical team, in addition to glomerular filtration rate and albuminuria. Rather than imposing long-term restrictions based on a single result, check trends and underlying causes.\u003c/p\u003e\n\u003ch3\u003e\n\u003ca href=\"#4-monitor-muscle-function-along-with-body-weight\" class=\"anchor\" id=\"4-monitor-muscle-function-along-with-body-weight\"\u003e\u003c/a\u003e4. Monitor Muscle Function Along With Body Weight\u003c/h3\u003e\n\u003cp\u003eCheck whether walking has become slower than usual, standing up from a chair has become difficult, or climbing stairs has become harder. Healthcare facilities may use grip strength, walking speed, body composition, and nutritional assessments.\u003c/p\u003e\n\u003ch3\u003e\n\u003ca href=\"#5-readjust-the-prescription-regularly\" class=\"anchor\" id=\"5-readjust-the-prescription-regularly\"\u003e\u003c/a\u003e5. Readjust the Prescription Regularly\u003c/h3\u003e\n\u003cp\u003eKidney function, medications, dialysis status, and appetite change over time. Rather than continuing a diet prescribed at an earlier stage, the level of restriction should be reassessed according to test results and nutritional status.\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#an-easily-overlooked-problem-the-complexity-of-restrictions-can-itself-be-risky\" class=\"anchor\" id=\"an-easily-overlooked-problem-the-complexity-of-restrictions-can-itself-be-risky\"\u003e\u003c/a\u003eAn Easily Overlooked Problem: The Complexity of Restrictions Can Itself Be Risky\u003c/h2\u003e\n\u003cp\u003eIf a patient separately follows instructions such as “no meat,” “no vegetables because of potassium,” “no dairy products or beans because of phosphorus,” and “no rice because of blood sugar,” there may be almost nothing left that the patient can actually eat. This can be viewed as the burden of dietary restrictions.\u003c/p\u003e\n\u003cp\u003eSafe counseling prioritizes the following steps instead of continuing to expand the list of prohibited foods.\u003c/p\u003e\n\u003col\u003e\n\u003cli\u003eFirst manage potentially life-threatening hyperkalemia or severe fluid overload.\u003c/li\u003e\n\u003cli\u003eIdentify clear sources of excess intake, such as sodium, added phosphorus, and excessive protein.\u003c/li\u003e\n\u003cli\u003eSuggest foods that can replace calories and essential nutrients at the same time.\u003c/li\u003e\n\u003cli\u003eRegularly compare the benefits of restriction with the risks of weight and muscle loss.\u003c/li\u003e\n\u003c/ol\u003e\n\u003cp\u003eInstructions about “what not to eat” should always be accompanied by guidance on “what to eat instead and how much.”\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#can-kidney-function-recover-through-diet\" class=\"anchor\" id=\"can-kidney-function-recover-through-diet\"\u003e\u003c/a\u003eCan Kidney Function Recover Through Diet?\u003c/h2\u003e\n\u003cp\u003eAcute kidney injury can substantially improve when its cause is treated, but structural damage caused by chronic kidney disease often cannot be completely reversed. A healthy diet or exercise should not be presented as a specific treatment that will necessarily regenerate the kidneys.\u003c/p\u003e\n\u003cp\u003eHowever, managing blood pressure and blood glucose while combining appropriate medications with diet and exercise may reduce albuminuria or slow the decline in kidney function. A realistic goal for patients is not the “complete cure” of a single test result, but slowing progression, preventing complications, and maintaining physical function.\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#signs-that-should-be-reported-promptly-to-the-medical-team\" class=\"anchor\" id=\"signs-that-should-be-reported-promptly-to-the-medical-team\"\u003e\u003c/a\u003eSigns That Should Be Reported Promptly to the Medical Team\u003c/h2\u003e\n\u003cp\u003eIf any of the following changes occur, it is best not to dismiss them as a simple appetite problem and to inform a nephrologist or clinical nutrition professional.\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003eUnintentional weight loss continues.\u003c/li\u003e\n\u003cli\u003eThere are consecutive days when only about half of the usual amount of food can be eaten.\u003c/li\u003e\n\u003cli\u003eNausea, vomiting, severe changes in taste, or difficulty swallowing occurs.\u003c/li\u003e\n\u003cli\u003eWalking or climbing stairs suddenly becomes difficult, or muscle strength clearly declines.\u003c/li\u003e\n\u003cli\u003eEdema or shortness of breath worsens, and weight changes rapidly.\u003c/li\u003e\n\u003cli\u003eSevere lethargy, palpitations, or a feeling of muscle paralysis occurs.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eSevere difficulty breathing, chest pain, changes in consciousness, or a sudden feeling of paralysis may require emergency evaluation.\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#summary\" class=\"anchor\" id=\"summary\"\u003e\u003c/a\u003eSummary\u003c/h2\u003e\n\u003cp\u003eFor patients with chronic kidney disease, the danger is not restriction itself but \u003cstrong\u003eexcessive restriction without evidence or a replacement plan\u003c/strong\u003e. During the non-dialysis stage, excess protein intake should be avoided, but sufficient calories and nutrients must be ensured; once dialysis begins, protein requirements change. Potassium and phosphorus should also be adjusted only after reviewing blood test results and actual food sources.\u003c/p\u003e\n\u003cp\u003eProtecting the kidneys and protecting muscle are not opposing goals. By assessing test results, current intake, weight changes, and physical function together, both goals can be pursued at the same time.\u003c/p\u003e\n","tags":["Kidney health","Chronic kidney disease","Dialysis","Kidney function","Sarcopenia"],"faqs":[{"question":"If I have chronic kidney disease, do I need to stop eating meat completely?","answer":"No. Patients who are not on dialysis may need to avoid excessive protein intake, but eliminating it completely can lead to nutritional deficiencies and muscle loss. The appropriate amount and sources should be determined based on kidney function, body weight, nutritional status, and whether the patient is on dialysis."},{"question":"Does eating less protein necessarily improve kidney function?","answer":"It cannot be said that it necessarily does. A supervised low-protein diet may help some stable patients who are not on dialysis, but adequate calorie intake and nutritional monitoring are essential. Arbitrarily reducing overall food intake may instead lead to loss of muscle and strength."},{"question":"Should I continue a low-protein diet after starting dialysis?","answer":"In general, patients on dialysis need more protein than those who are not on dialysis. Because protein loss and catabolism during dialysis must be taken into account, they should not simply continue their pre-dialysis diet and should be reassessed at their dialysis center."},{"question":"Should people with kidney disease avoid all fruits and vegetables?","answer":"No. Potassium restriction should be individualized when blood potassium levels are high or a risk of elevation has been identified. Broadly eliminating fruits and vegetables when test results are normal can lead to inadequate intake of dietary fiber and micronutrients."},{"question":"If I am not losing weight, does that mean my nutritional status is fine?","answer":"Not necessarily. Edema or fluid gain can mask muscle loss. In addition to body weight, food intake, grip strength, walking ability, muscle mass, and blood test results should be assessed together."},{"question":"Is it enough to use low-protein foods made for people with kidney disease?","answer":"Low-protein products may help some patients control protein intake while obtaining enough calories, but they are not necessary for everyone. Sodium, sugars, the overall diet, and nutritional status must also be reviewed, and these products should not excessively replace regular meals."},{"question":"Can exercise repair damaged kidneys?","answer":"It cannot be concluded that exercise directly reverses chronic structural damage. However, aerobic and strength exercises suited to the individual may help maintain fitness and muscle and manage blood pressure and blood sugar. Exercise intensity should be determined with consideration of cardiovascular status, the dialysis schedule, and other factors."},{"question":"If I have both diabetes and chronic kidney disease, do I also need to greatly reduce carbohydrates?","answer":"Blood sugar management is necessary, but excessively reducing carbohydrates and total calorie intake can lead to inadequate nutrition. Sugary drinks and refined foods should be adjusted first, and energy sources and food intake should be determined while considering blood sugar, body weight, and kidney function together."},{"question":"If blood tests show high phosphorus levels, should I stop consuming all dairy products and beans?","answer":"Uniform, across-the-board restriction is difficult to recommend. First, processed foods high in phosphate additives should be identified, and the nutritional value of each food, phosphorus absorption rates, protein needs, and instructions for taking prescribed phosphate binders should be reviewed together."},{"question":"Can chronic kidney disease be cured through diet alone?","answer":"Most cases of chronic kidney disease cannot be considered curable through diet alone. Appropriate diet, exercise, blood pressure and blood sugar management, and medication are intended to slow the decline in kidney function and reduce the risk of complications."}],"sources":[{"url":"https://kdigo.org/guidelines/ckd-evaluation-and-management/","title":"KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease","type":"source"},{"url":"https://www.ajkd.org/article/S0272-6386(20)30726-5/fulltext","title":"KDOQI Clinical Practice Guideline for Nutrition in CKD: 2020 Update","type":"source"},{"url":"https://www.niddk.nih.gov/health-information/kidney-disease/chronic-kidney-disease-ckd/eating-nutrition","title":"Healthy Eating for Adults with Chronic Kidney Disease","type":"source"},{"url":"https://pubmed.ncbi.nlm.nih.gov/18094682/","title":"A proposed nomenclature and diagnostic criteria for protein-energy wasting in acute and chronic kidney disease","type":"source"}],"images":[{"id":668,"url":"https://injoys.com/rails/active_storage/blobs/proxy/eyJfcmFpbHMiOnsiZGF0YSI6ODMxNCwicHVyIjoiYmxvYl9pZCJ9fQ==--42111469cdaea05f66b9742d9262b47dce1031f8/ai-38b5259b.webp","is_representative":true,"generation_method":"ai_image","license":"ai_generated","mime_type":"image/webp","translations":{"ko":{"alt":"밥, 연어, 채소, 과일, 견과류가 담긴 접시와 콩팥·검사관·체중계·근육 도식","caption":"콩팥 건강을 위한 균형 잡힌 식사와 검사, 체중 및 근육 관리를 함께 보여준다.","description":null},"en":{"alt":"Plate with rice, salmon, vegetables, fruit and nuts beside kidneys, test tubes, a scale and muscle","caption":"The graphic connects a balanced diet with kidney tests, body weight and muscle health.","description":null},"ja":{"alt":"ご飯、サケ、野菜、果物、ナッツの皿と腎臓、検査管、体重計、筋肉の図","caption":"腎臓の健康を支えるバランスのよい食事と検査、体重・筋肉管理を示している。","description":null},"es":{"alt":"Plato con arroz, salmón, verduras, fruta y frutos secos junto a riñones, tubos, báscula y músculo","caption":"El gráfico relaciona una dieta equilibrada con los análisis renales y el cuidado del peso y los músculos.","description":null},"id":{"alt":"Piring berisi nasi, salmon, sayur, buah, dan kacang di samping ginjal, tabung tes, timbangan, dan otot","caption":"Ilustrasi ini mengaitkan pola makan seimbang dengan tes ginjal serta pengelolaan berat badan dan otot.","description":null},"pt":{"alt":"Prato com arroz, salmão, legumes, frutas e castanhas ao lado de rins, tubos, balança e músculo","caption":"O gráfico relaciona uma alimentação equilibrada a exames renais e ao cuidado com o peso e os músculos.","description":null},"zh-hant":{"alt":"盛有米飯、鮭魚、蔬菜、水果與堅果的餐盤，周圍有腎臟、試管、體重計和肌肉圖示","caption":"圖示呈現均衡飲食與腎功能檢查、體重及肌肉管理之間的關聯。","description":null},"de":{"alt":"Teller mit Reis, Lachs, Gemüse, Obst und Nüssen neben Nieren, Reagenzgläsern, Waage und Muskel","caption":"Die Grafik verbindet ausgewogene Ernährung mit Nierenwerten sowie Gewichts- und Muskelmanagement.","description":null}}},{"id":669,"url":"https://injoys.com/rails/active_storage/blobs/proxy/eyJfcmFpbHMiOnsiZGF0YSI6ODMyMCwicHVyIjoiYmxvYl9pZCJ9fQ==--ef828f3b4297defbcab5e3a2bcc124ce44b573b4/ai-a0e042d4.webp","is_representative":false,"generation_method":"ai_image","license":"ai_generated","mime_type":"image/webp","translations":{"ko":{"alt":"콩팥, 투석기, 혈액 검사관과 다양한 균형 잡힌 식사가 배치된 건강 관리 삽화","caption":"콩팥병 식사는 무조건 줄이기보다 영양소와 양을 알맞게 조절하는 것이 중요합니다.","description":null},"en":{"alt":"Kidneys, a dialysis machine, blood samples, and varied balanced meals in a health illustration","caption":"The illustration emphasizes choosing suitable nutrients and portions rather than simply eating less.","description":null},"ja":{"alt":"腎臓、透析装置、血液検体、多彩でバランスのよい食事を描いた健康管理のイラスト","caption":"腎臓病の食事では、単に減らすのではなく栄養素と量を適切に調整することが大切です。","description":null},"es":{"alt":"Riñones, máquina de diálisis, muestras de sangre y comidas variadas y equilibradas","caption":"La ilustración destaca que conviene ajustar nutrientes y porciones en vez de limitarse a comer menos.","description":null},"id":{"alt":"Ginjal, mesin dialisis, sampel darah, dan beragam makanan seimbang dalam ilustrasi kesehatan","caption":"Ilustrasi ini menekankan pengaturan zat gizi dan porsi yang tepat, bukan sekadar makan lebih sedikit.","description":null},"pt":{"alt":"Rins, máquina de diálise, amostras de sangue e refeições variadas e equilibradas","caption":"A ilustração destaca o ajuste de nutrientes e porções, em vez de simplesmente comer menos.","description":null},"zh-hant":{"alt":"腎臟、洗腎機、血液檢體與多樣均衡餐點的健康管理插畫","caption":"腎臟病飲食重點不是一味少吃，而是適當調整營養素與份量。","description":null},"de":{"alt":"Nieren, Dialysegerät, Blutproben und vielfältige ausgewogene Mahlzeiten in einer Gesundheitsgrafik","caption":"Die Grafik betont passende Nährstoffe und Portionen, statt einfach weniger zu essen.","description":null}}}],"published_at":"2026-08-16T07:45:32+09:00","updated_at":"2026-08-16T07:45:32+09:00","license":"cc_by","translation_status":"reviewed","available_locales":["ko","en","ja","es"],"data_locales":["ko","en","ja","es","id","pt","zh-hant","de"],"url":"https://injoys.com/en/articles/ckd-diet-restriction-malnutrition-sarcopenia"}