Is coconut water good for weight loss?

Not as a weight loss tool, because nobody has tested it as one. We found no randomized trial and no systematic review of coconut water and body weight. What exists is evidence about sugary drinks in general. A 2023 meta-analysis of 169 controlled trials in 10,357 people found that sugars added on top of the diet raised body weight by 0.62 lb (95% CI 0.13 to 1.1; metric: 0.28 kg, 0.06 to 0.50), and taking them out lowered it by 2.1 lb (95% CI 0.31 to 3.9; metric: 0.96 kg, 0.14 to 1.78), on generally moderate-certainty evidence. Coconut water was not among the 14 food sources tested. Unsweetened coconut water is a low-calorie drink at about 43 calories and 9.4 g of sugars per 240 g serving. The sweetened kind has about twice the sugar.

Unsettled. Whether coconut water helps, hurts or does nothing for weight has never been measured. Everything on this page about weight is borrowed from trials of other drinks, so it tells you what coconut water probably does by what it contains. A trial would be needed to say more.

What the trials found

Sugar in drinks, from 169 trials

The 2023 meta-analysis split its trials by food source. When sugars were added to the diet, sugar-sweetened beverages and fruit drinks raised weight, while 100% fruit juice at up to 10 percent of energy did not. Coconut water was not tested, so which of those groups it sits closer to is a judgment. Unsweetened, it has 18 calories and 3.92 g of sugars per 3.5 oz (100 g). Sweetened, it has 37 calories and 8.78 g of sugars per 3.5 oz (100 g), which comes to about 133 calories and 32 g of sugars in a 13 oz (360 g) can.

Established. Drinking sugar on top of what you already eat adds weight, and taking it away removes some. In the meta-analysis of 169 trials the gains and losses were under a kilogram on average, so this is a small lever, and it is a well measured one.

Swapping caloric drinks for water

The nearest test of what people mean by drinking coconut water to lose weight is replacing one drink with another. In a 6-month randomized trial of 318 adults with overweight or obesity, mostly women, people who replaced at least 200 calories a day of caloric drinks with water or diet drinks lost 2 to 2.5 percent of their weight on average. The attention control group lost 1.76 percent, and the difference between groups was not statistically significant. The benefit came from the calories removed, and no particular drink was the active ingredient.

A 2026 consensus statement with an updated meta-analysis of 14 randomized trials, lasting 3 to 76 weeks, found that replacing sugar-sweetened drinks with artificially sweetened ones lowered body weight by 1.6 lb (0.73 kg) and body fat by 0.72 percent. That is a modest effect, and coconut water was not in those trials either.

How it is sold

In an audit of 945 labels of sugar-containing drinks in Australian grocery stores, 87.7 percent carried features that position the drink as better for you. Coconut waters were among the categories where those features were most common, alongside iced teas, sports drinks and juices. That is a study of marketing and it says nothing about weight. It explains why the question gets asked.

Who should be careful

Not for everyone. Coconut water carries potassium. According to the NIH Office of Dietary Supplements, people with chronic kidney disease, or taking ACE inhibitors or potassium-sparing diuretics, can develop high blood potassium even from dietary potassium below the adequate intake. If that is you, drinking coconut water in place of plain water every day is worth raising with the person treating you.

For people without kidney disease, the one safety trial we found is reassuring within its limits. In a double-blind randomized trial of 95 adults with mild to moderate ulcerative colitis, 14 fl oz (400 mL) of coconut water a day for 8 weeks caused no more adverse events than placebo, and no patient developed high blood potassium. The participants did not have kidney disease, and weight was not measured.

What expert bodies say

We found no expert body that speaks to coconut water and weight. The 2026 consensus on drink swaps put water and unsweetened drinks first. The NIH Office of Dietary Supplements potassium fact sheet, quoted above, covers safety for people with kidney disease or on certain medicines.

How we searched

What would change this answer

• A randomized trial that replaces sugar-sweetened drinks with coconut water, compared with plain water, with body weight as the outcome. We found none in our local index of ClinicalTrials.gov.
• Any human trial that measures appetite or energy intake after coconut water. The only studies we found were in animals.

For what coconut water contains, see the coconut water page.

Sources

1. ev-cwwl-01 · Meta-analysis or systematic review · systematic review and meta-analysis of controlled trials · n = 169 trials (255 comparisons), 10,357 participants
   Total fructose-containing sugars increased body weight (MD: 0.28 kg; 95% CI: 0.06, 0.50 kg; PMD = 0.011) in addition trials and decreased body weight (MD: -0.96 kg; 95% CI: -1.78, -0.14 kg; PMD = 0.022) in subtraction trials with no effect in substitution or ad libitum trials.
   
   Who: controlled trials of at least 2 weeks of food sources of fructose-containing sugars, searched to April 2022
   Effect: addition trials MD +0.62 lb (0.13 to 1.1; metric: 0.28 kg, 0.06 to 0.50); subtraction trials MD -2.1 lb (-3.9 to -0.31; metric: -0.96 kg, -1.78 to -0.14); no effect in substitution or ad libitum trials; GRADE generally moderate
   Certainty: Coconut water was not studied; transfer via sugar content (≈4 g/100 g without sugar) is a conclusion by analogy.
   Am J Clin Nutr, 2023 · checked 2026-10-07 · we read the abstract
2. ev-cwwl-02 · Meta-analysis or systematic review · systematic review and meta-analysis of controlled trials · n = 169 trials, 10,357 participants
   There was interaction/influence by food sources on body weight: substitution trials [fruits decreased; added nutritive sweeteners and mixed sources (with SSBs) increased]; addition trials [dried fruits, honey, fruits (≤10%E), and 100% fruit juice (≤10%E) decreased; SSBs, fruit drink, and mixed sources (with SSBs) increased]; subtraction trials [removal of mixed sources (with SSBs) decreased]; and ad libitum trials [mixed sources (with/without SSBs) increased].
   
   Who: addition trials by food source within 169 controlled trials
   Effect: addition trials: dried fruits, honey, fruits (<=10%E) and 100% fruit juice (<=10%E) decreased weight; SSBs, fruit drink and mixed sources with SSBs increased
   Certainty: Coconut water was not studied among the sources; which group to assign it to is a judgment, not data.
   Am J Clin Nutr, 2023 · checked 2026-10-07 · we read the abstract
3. ev-cwwl-03 · Meta-analysis or systematic review · consensus statement with updated meta-analysis of RCTs · n = 14 RCTs
   In 14 RCTs (3-76 weeks), replacing SSBs with ASBs produced modest reductions in body weight (-0.73 kg) and body fat (-0.72%), with inconsistent effects on glycemic and cardiometabolic markers.
   
   Who: RCTs replacing sugar-sweetened beverages with artificially sweetened beverages
   Effect: body weight -1.6 lb (-0.73 kg), body fat -0.72%
   Certainty: Beverage substitution, not coconut water; the effect is small.
   Diabetes Metab J, 2026 · checked 2026-10-07 · we read the abstract
4. ev-cwwl-04 · Randomized controlled trial(s) · randomized controlled trial · n = 318
   Replacement of caloric beverages with noncaloric beverages as a weight-loss strategy resulted in average weight losses of 2% to 2.5%.
   
   Who: overweight and obese adults, BMI 36.3, 84% female, substituting noncaloric beverages for caloric beverages (>=200 calories/d)
   Effect: weight -2.5% diet beverages, -2.03% water, -1.76% attention control at 6 months; no significant difference between groups; OR 2.07 (1.02-4.22) for 5% weight loss with any replacement
   Certainty: Difference from control not significant; the benefit comes from the energy removed, not a specific drink.
   Am J Clin Nutr, 2012 · checked 2026-10-07 · we read the abstract
5. ev-cwwl-05 · Position of an expert body · USDA reference dataset · n = 1 food code
   Coconut water, unsweetened (fdc_id 2707572): Energy 18 KCAL per 100 g; Quantity not specified 240 g 43.2 KCAL; Total Sugars 3.92 G per 100 g; 240 g 9.4 G
   
   Who: FNDDS food code 42403010 Coconut water, unsweetened
   Effect: 18 calories/100 g; total sugars 3.92 g/100 g; 8.5 oz (240 g) serving 43.2 calories, 9.4 g sugars
   Certainty: A single averaged value; brands differ.
   USDA FNDDS 2021-2023, food code 42403010, FDC 2707572 · checked 2026-10-07 · we read the dataset
6. ev-cwwl-06 · Position of an expert body · USDA reference dataset · n = 1 food code
   Coconut water, sweetened (fdc_id 2707573): Energy 37 KCAL per 100 g; Total Sugars 8.78 G per 100 g; 1 can 360 g
   
   Who: FNDDS food code 42404010 Coconut water, sweetened
   Effect: 37 calories/100 g; total sugars 8.78 g/100 g; 13 oz (360 g) can about 133 calories, 31.6 g sugars (calculated)
   Certainty: The value on the can is calculated from 100 g and a measure weight of 360 g.
   USDA FNDDS 2021-2023, food code 42404010, FDC 2707573 · checked 2026-10-07 · we read the dataset
7. ev-cwwl-07 · Observational data · cross-sectional label audit · n = 945
   Features positioning beverages as BFY were more common among certain categories of beverages, namely coconut waters, iced teas, sports drinks and juices.
   
   Who: labels of sugar-containing beverages in 17 Adelaide grocery stores, 2016
   Effect: 87.7% of labels had better-for-you features; more common for coconut waters, iced teas, sports drinks and juices
   Certainty: Label audit, not an effect on weight.
   Public Health Nutr, 2018 · checked 2026-10-07 · we read the abstract
8. ev-cwwl-08 · Randomized controlled trial(s) · randomized double-blind placebo-controlled trial · n = 95
   Adverse events were comparable, and no patient developed hyperkalemia.
   
   Who: patients with mild to moderate endoscopically active ulcerative colitis, 14 fl oz (400 mL) coconut water for 8 weeks
   Effect: adverse events comparable; no hyperkalemia
   Certainty: Patients without CKD; weight was not measured as an outcome.
   Clin Gastroenterol Hepatol, 2024 · checked 2026-10-07 · we read the abstract
9. ev-cwwl-09 · Position of an expert body · fact sheet · n = —
   However, in people with impaired urinary potassium excretion due to chronic kidney disease or the use of certain medications, such as angiotensin converting enzyme (ACE) inhibitors or potassium-sparing diuretics, even dietary potassium intakes below the AI can cause hyperkalemia [11].
   
   Who: people with impaired urinary potassium excretion, NIH potassium fact sheet
   Effect: hyperkalemia possible even at dietary potassium intakes below the AI
   Certainty: General statement about potassium from food; coconut water is not mentioned separately.
   NIH Office of Dietary Supplements, Potassium Fact Sheet for Health Professionals · checked 2026-10-07 · we read the section