Does pineapple help with weight loss?

Nobody knows, because it has not been tested in people. We found no randomized trial and no systematic review of pineapple, the fruit or its juice, and body weight in humans. A 2025 review of bromelain, the pineapple enzyme, says the same: there are no clinical trials in humans of its weight loss effect. The one placebo-controlled trial of bromelain that measured the body, in 68 people with diabetes taking 1,050 mg a day for 12 weeks, found no change in anthropometric measures against placebo.

Myth. There is no evidence in people that pineapple or its enzyme melts fat. The claim rests on laboratory and rat studies. The EU did not authorize a claim recommending pineapple powder and a bromelain extract during a slimming diet.

Unsettled. What can be said is about fruit in general, and it is small. Observational data link more fruit with slightly less weight gain over years. Pineapple was not analyzed on its own in those studies, so its share of that pattern is unknown.

What the trials found

Bromelain supplements

The placebo-controlled trial enrolled Chinese adults with diabetes and at least one other cardiovascular risk factor, mean age 61. Bromelain at 1,050 mg a day for 12 weeks did not change body measures, blood fats, blood pressure, blood glucose or C-reactive protein in a way that reached statistical significance. Weight was a secondary outcome, and a capsule of enzyme is a different thing from a bowl of fruit.

The fruit, in rats only

In male rats made obese by a high-fat diet, raw pineapple juice brought body weight, body fat and blood lipids back near normal values. No one has repeated that in people, and a rat dose does not translate into a human portion.

Fruit in everyday life

A meta-analysis of 17 cohort studies with 563,277 adults linked each extra 3.5 oz (100 g) of fruit a day with 13.68 g less weight gain per year, an interval of 4.40 to 22.97 g. That is a very small amount, and the authors rated the studies as low quality. In three US cohorts of 133,468 adults, each extra daily serving of fruit went with 0.53 lb less weight gain over four years. Berries, at 1.11 lb, and apples or pears, at 1.24 lb, showed the strongest links. Pineapple was not one of the groups analyzed. These are associations in people who ate more fruit, and those people differ in other ways too.

Fresh and dried are different foods

Raw pineapple gives 60 calories per 3.5 oz (100 g) by USDA data, about 99 calories for a 165 g cup. Dried pineapple gives 347 calories per 3.5 oz (100 g). For anyone counting calories, the form matters more than the fruit.

Who should be careful

Not for everyone. People on blood thinners who take bromelain supplements. A 2024 review of bromelain reports trial side effects of diarrhea, nausea, vomiting and allergic reactions, and a risk of bleeding, especially with anticoagulants such as warfarin and clopidogrel.

The US National Center for Complementary and Integrative Health says the most commonly reported side effects of bromelain are stomach upset and diarrhea. It advises anyone taking any medicine to talk with a health care provider before using bromelain, because some herbs and medicines interact in harmful ways. These cautions are about the supplement. This search turned up nothing on harm from eating the fresh fruit in normal amounts, which is a gap in our search, not a reassurance.

What expert bodies say

The EU register lists a claim recommending pineapple powder and a bromelain extract during a slimming diet as non-authorized. That means the dossier did not convince the regulator. It does not prove the product cannot work. NCCIH covers bromelain safety, quoted above. We found no statement from NIH, EFSA or WHO on pineapple and body weight.

How we searched

What would change this answer

• A randomized trial of fresh pineapple eaten in place of a snack of similar energy, with body weight as the main outcome. We found none published.
• A placebo-controlled bromelain trial in people with obesity and no other disease, which the 2025 review itself calls for.
• A pineapple-specific estimate from the large fruit cohorts, which report it only inside total fruit.

More on the fruit itself is on the pineapple page.

Sources

1. ev-pinwl-01 · Laboratory or animal data · narrative review · n = —
   However, it should be noted that there are a lack of clinical trials in humans related to its weight loss effect. There is a high need for randomized clinical trials in obese people without additional diseases.
   
   Who: cell, animal and human studies of bromelain summarized in a narrative review
   Effect: no human clinical trials of weight loss identified
   Certainty: Direct answer to axis 9: there are no RCTs on pineapple or bromelain for weight. The review mentions two small bromelain RCTs in T2D with different results.
   International Journal of Molecular Sciences, 2025 · checked 2026-10-07 · we read the fulltext
2. ev-pinwl-02 · Randomized controlled trial(s) · randomized placebo-controlled double-blind parallel trial, 1,050 mg/day bromelain for 12 weeks · n = 68
   Similarly, the difference in mean change in other CVD risk factors (blood lipids, blood pressure), blood glucose, C-reactive protein and anthropometric measures between the bromelain and placebo groups was also not statistically significant.
   
   Who: Chinese diabetic patients with at least one CVD risk factor, mean age 61
   Effect: no statistically significant difference in change in anthropometric measures vs placebo
   Certainty: Enzyme supplement, not the fruit; weight is a secondary measure. The only placebo-controlled RCT with anthropometry found.
   Chin J Integr Med, 2016 · checked 2026-10-07 · we read the abstract
3. ev-pinwl-03 · Observational data · systematic review and meta-analysis of prospective cohort studies · n = 563277
   Higher intake of fruits was inversely associated with weight change (decrease) (beta-coefficient per 100-g increment, -13.68 g/year; 95% CI, -22.97 to -4.40).
   
   Who: Adults in 17 prospective cohort studies
   Effect: weight change -13.68 g/year per 100 g/day fruit (95% CI -22.97 to -4.40); highest vs lowest fruit intake OR 0.83 (0.71-0.99) for adiposity
   Certainty: About fruit in general, not pineapple. The effect is negligible (~14 g per year), the authors acknowledge low quality of the studies.
   PLoS One, 2015 · checked 2026-10-07 · we read the abstract
4. ev-pinwl-04 · Observational data · three prospective cohort studies pooled by random-effects meta-analysis · n = 133468
   Increased intake of fruits was inversely associated with 4-y weight change: total fruits -0.53 lb per daily serving (95% CI -0.61, -0.44), berries -1.11 lb (95% CI -1.45, -0.78), and apples/pears -1.24 lb (95% CI -1.62, -0.86).
   
   Who: US men and women in three prospective cohorts, 1986-2010
   Effect: total fruits -0.53 lb per daily serving per 4 years (95% CI -0.61 to -0.44); berries -1.11 lb; apples/pears -1.24 lb
   Certainty: Pineapple was not analyzed as a separate group (groups: citrus, melons, berries, apples/pears, etc.). Residual confounding is possible.
   PLoS Med, 2015 · checked 2026-10-07 · we read the abstract
5. ev-pinwl-05 · Laboratory or animal data · animal experiment · n = —
   HFD induced significant elevations in body weight, body mass index (BMI), body fat accumulation, liver fat deposition and blood lipids while juice restored these parameters near to their normal values.
   
   Who: male Wistar rats with high-fat-diet-induced obesity
   Effect: body weight, BMI, body fat and blood lipids restored near normal; lower insulin and leptin
   Certainty: Animals only; not tested in humans. We do not transfer the dose to humans.
   Food Science and Biotechnology, 2018 · checked 2026-10-07 · we read the abstract
6. ev-pinwl-06 · Position of an expert body · food composition database · n = —
   Pineapple, raw, FNDDS code 63141010, fdc_id 2709260: Energy 60 KCAL per 100 g; 1 slice 56 g, 33.6 KCAL; 1 cup 165 g. Pineapple, dried, fdc_id 2709210: Energy 347 KCAL and Total Sugars 77.12 G per 100 g
   
   Who: USDA FNDDS food composition data
   Effect: raw 60 calories/100 g, 1 cup 165 g = 99 calories, 1 slice 56 g = 33.6 calories; dried 347 calories/100 g, 77.12 g sugars/100 g
   Certainty: For weight loss, the form matters: fresh pineapple is low in calories, dried is ~6 times higher in calories and almost 80% sugar. The 99 calories cup is our recalculation 165 g × 0.60.
   USDA FNDDS, food codes 63141010 Pineapple, raw (fdc_id 2709260) and Pineapple, dried (fdc_id 2709210) · checked 2026-10-07 · we read the dataset
7. ev-pinwl-07 · Laboratory or animal data · narrative review · n = —
   Although bromelain is well tolerated and considered a safe nutraceutical, clinical trials have reported some side effects, including temporary diarrhea, nausea, vomiting, allergic reactions, and risk of bleeding, especially in people treated with anticoagulants such as warfarin and clopidogrel [1].
   
   Who: clinical trials of bromelain supplements summarized in a narrative review
   Effect: temporary diarrhea, nausea, vomiting, allergic reactions, bleeding risk with anticoagulants
   Certainty: About bromelain supplements "for weight loss," not the fruit in a normal amount. Who should be careful: anticoagulants and antiplatelets.
   Children (Basel), 2024, Current Uses of Bromelain in Children: A Narrative Review · checked 2026-10-07 · we read the fulltext
8. ev-pinwl-08 · Position of an expert body · agency consumer fact sheet · n = —
   The most commonly reported side effects have been stomach upset and diarrhea.
   
   Who: people taking bromelain supplements orally
   Effect: most common side effects: stomach upset, diarrhea
   Certainty: About a supplement, not the fruit.
   NIH National Center for Complementary and Integrative Health, Bromelain (last updated November 2024) · checked 2026-10-07 · we read the section
9. ev-pinwl-09 · Position of an expert body · agency consumer fact sheet · n = —
   If you take any type of medicine, talk with your health care provider before using bromelain or other herbal products; some herbs and medicines interact in harmful ways.
   
   Who: people taking any medicine
   Effect: consult before combining bromelain with medicines
   Certainty: General advice; specifically for anticoagulants, card ev-pinwl-07.
   NIH National Center for Complementary and Integrative Health, Bromelain (last updated November 2024) · checked 2026-10-07 · we read the section
10. ev-pinwl-10 · Position of an expert body · EU Register on nutrition and health claims, entry POL-HC-6600, snapshot of 2026-09-21 · n = —
    POL-HC-6600 Ananas : Pineapple powder (Ananas sativus) obtained from fruit juice and stems AND Dry aqueous extract of pineapple standardized at 2% of bromelain Recommended during slimming diet, at the same time of dietary measures. Pineapple is a tropical plant whose stems contain bromelain, a proteolytic enzymatic complex. Bromelain is a proteolytic enzyme with anti-edematous activity which can help to drain tissues with cellulitis. Non-authorised
    
    Who: —
    Effect: POL-HC-6600 status Non-authorized
    Certainty: Rejection means the dossier did not convince, not that "it does not work" has been shown. This is exactly the marketing sentence about weight loss that the buyer sees.
    EU Register on nutrition and health claims, claim POL-HC-6600, snapshot of 2026-09-21 · checked 2026-10-07 · we read the row