Korea Reports 12% CKD Prevalence, Urges Kidney-Safe Diet and Medication Use
Korean health authorities emphasize that the kidney is a vital, but often silent, organ. It filters waste from the blood, removes excess water, maintains electrolyte balance, helps regulate blood pressure, and supports hormone production. The Korea Disease Control and Prevention Agency notes that about 12% of Koreans have chronic kidney disease, roughly one in eight adults.
Dietary habits can place additional strain on the kidneys. A high-protein diet, especially when combined with protein or amino acid supplements aimed at dieting or muscle building, can increase the workload on the kidneys. As protein is metabolized, nitrogen waste such as urea and creatinine is produced, and the kidneys may have to work harder to clear it, potentially leading to glomerular damage and protein in the urine if the pattern continues. A clinician at Incheon Himchan General Hospital cautions that sustained very high protein intake—nearly 2 grams per kilogram of body weight daily for extended periods—should be avoided even by healthy adults.
Fruit and vegetables also merit attention for people with reduced kidney function. Many fruits are high in potassium, and too much potassium can cause dangerous levels in the blood for those whose kidneys cannot excrete it efficiently. Symptoms of high potassium can include numbness, muscle weakness, changes in heart rhythm, and in severe cases, life-threatening events. Experts advise consulting a clinician to tailor potassium intake, and suggest rinsing or soaking produce to reduce potassium content.
Long-term use of painkillers and high sodium intake are other risk factors. Nonsteroidal anti-inflammatory drugs, or NSAIDs, can constrict kidney blood vessels by inhibiting prostaglandins, reducing kidney blood flow. The risk rises for patients taking blood pressure medications or diuretics, so medical guidance is important. Excess sodium raises blood pressure and burdens the kidney’s microvasculature, increasing the risk of proteinuria. Adults are advised to keep salt intake under about 5 grams per day, and to maintain hydration while replacing electrolytes after sweating.
Regular screening is crucial because kidney function can decline with few or no symptoms until it is already substantially impaired. Blood tests for creatinine and estimated glomerular filtration rate (eGFR), along with urine tests for protein, can detect early changes. In Korea, an eGFR below 60 milliliters per minute per 1.73 square meters prompts a referral to a nephrologist.
Hypertension and diabetes are identified as major causes of chronic kidney disease. People with risk factors such as a family history of kidney disease, or those who must use analgesics or immunosuppressants for extended periods, should undergo regular blood and urine testing.
Why this matters beyond Korea, especially for U.S. readers: chronic kidney disease is a global health issue linked to aging populations, rising rates of diabetes and hypertension, and widespread use of NSAIDs. The same dietary cautions—moderating excessive protein and sodium, managing potassium intake when kidney function is impaired, and avoiding prolonged high-dose painkiller use—apply to many Americans. Regular screening can catch kidney problems early, potentially reducing downstream costs for the health system, preserving patient quality of life, and stabilizing labor market participation and productivity. For policymakers and healthcare leaders, the Korean experience reinforces the need for public guidance on diet, medication safety, and routine kidney function monitoring as part of broader chronic disease prevention efforts.