Is coconut water good for kidney disease?

USDA FoodData Central, Nuts, coconut water (liquid from coconuts). The 200 mg line is per serving, so the same food can be under it in a small portion and over it in a large one.

• Level E National Kidney Foundation: A food that is considered “high-potassium” generally has 200 mg or more potassium per serving. National Kidney Foundation, Potassium and Your CKD Diet, accessed 2026-10-12
• Level E NIDDK (NIH): Keep in mind, your body absorbs more phosphorus from animal-based foods, such as meat and poultry, than from plant-based foods, such as beans and seeds. NIDDK, Healthy Eating for Adults with Chronic Kidney Disease, accessed 2026-10-12

Word-for-word quotes. Level E means the position of an expert body. How we grade evidence.

Same USDA food group, each at its usual US portion. USDA FoodData Central.

Potassium limits apply to people whose care team has set one.

• Level C The standard advice to cut potassium in kidney disease rests on very low-quality evidence: restricting it moved blood potassium by 0.22 millimoles per liter and did not slow the disease. Morris et al., Journal of Renal Nutrition, 2020
• Level E There is no RDA for potassium because the data were insufficient to derive one, and no upper limit because high intakes do not cause hyperkalemia in adults with normal kidney function. NIH Office of Dietary Supplements, Health Professional Fact Sheet: Potassium

• Level B In a double-blind trial in 95 adults with mild to moderate ulcerative colitis, 14 fl oz (400 mL) of coconut water daily for 8 weeks added to standard therapy raised remission to 53.1% from 28.3% on placebo, with no case of hyperkalemia. Clin Gastroenterol Hepatol, 2024
• Level E According to NIH ODS, people with chronic kidney disease or on ACE inhibitors or potassium-sparing diuretics can develop high blood potassium even from dietary intakes below the adequate intake. NIH Office of Dietary Supplements, Potassium Fact Sheet for Health Professionals
• Level E The US label for losartan, a common blood pressure drug, warns that combining it with other things that raise serum potassium may cause hyperkalemia. Losartan potassium tablets, FDA-approved label (DailyMed), effective 2026-08-27

Levels: A is a meta-analysis of trials, B a randomized trial, C an observational study, D lab or animal work, E an expert position. How we grade evidence.

Many people drink coconut water for hydration, and on a kidney diet that is where it causes trouble. A cup has 600 mg of potassium, three times the 200 mg line. It also has 252 mg of sodium.

About a quarter of a cup (2 fl oz) stays under 200 mg of potassium. A third of a cup already reaches it. Brewed tea or coffee is a lower-potassium way to get fluid, at 88 mg and 116 mg a cup. The National Kidney Foundation still limits them, to 16 ounces of tea and 8 ounces of coffee.

NIH notes that people with chronic kidney disease, or who take ACE inhibitors or potassium-sparing diuretics, can develop high blood potassium even from food. The ulcerative colitis trial above, where no one developed high potassium on 14 fl oz (400 mL) a day, was not done in people with kidney disease. Ask your care team before you use coconut water for hydration.

Evidence behind this note

1. Level E According to NIH ODS, people with chronic kidney disease or on ACE inhibitors or potassium-sparing diuretics can develop high blood potassium even from dietary intakes below the adequate intake. NIH Office of Dietary Supplements, Potassium Fact Sheet for Health Professionals

Written from the agency positions and data on this page, reviewed by the Bioma editorial system. How we verify.

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