Does pineapple juice help digestion and constipation?

Nobody has tested it. We found no randomized trial and no review of pineapple juice for constipation, indigestion or digestion in general. A 2024 meta-analysis of foods and drinks for chronic constipation in adults gathered 23 studies with 1714 participants, and none of them used pineapple or its juice. The juice itself carries 0.2 g of fiber per 3.5 oz (100 g) in US survey data and only a trace in UK data. The claims you read online lean on bromelain, the pineapple enzyme, taken as a capsule in doses a glass of juice was never measured against.

Unsettled. Fruit-based foods do help constipation in trials, and pineapple has never been part of that evidence. A 2026 network meta-analysis of 19 randomized trials in functional constipation ranked fruit-based foods above fiber supplements and placebo for how often people opened their bowels, with moderate certainty against placebo. The abstract does not name the fruits, and the full text was not available to us. Pineapple juice cannot borrow that result.

What the trials found

Foods tested for constipation

In the 2024 meta-analysis the foods were kiwifruit, high-mineral water, prunes, rye bread, mango, fig, cereal, oat bran, yogurt and a few diets. The only juice was prune juice, in one study. Children were not covered. The 2026 network meta-analysis searched to August 2025 and pooled 19 trials of diet in functional constipation, and it found fruit-based foods worked better than fiber supplements.

What is in the glass

Canned pineapple in juice has 0.8 g of fiber per 3.5 oz (100 g) in US survey data, four times the 0.2 g in 100 percent juice. UK data list fiber in unsweetened pineapple juice as a trace, with fructose and glucose at 2.9 g each per 3.5 oz (100 g), so there is no surplus of fructose over glucose, and neither dataset reports sorbitol. A US survey glass of 248 g carries about 131 calories and 24.8 g of sugars.

The pulp the juice leaves behind

The nearest thing to a pineapple constipation trial used the opposite of juice. In a 14-day controlled study of 60 adults, 7.41 g a day of powder made from pineapple pulp left over after juicing gave 5 g of fiber and improved every measure of bowel movement frequency from day 0 to 7 against placebo. The study does not say how people were allocated, and the powder's maker sponsored it. At day 7 fewer people on the pineapple powder reported normal stool than on placebo, 44 percent against 65 percent, before stools settled by day 14.

Bromelain as a supplement

In a triple-blind randomized trial of 70 people with mild to moderate ulcerative colitis, 400 mg of bromelain a day for 8 weeks lowered a disease activity score by 3.29 points against 1.11 on placebo (p below 0.001). Quality of life did not differ (p = 0.90). That is a supplement in people with a bowel disease. How much active bromelain a glass of shop-bought, pasteurized juice holds has not been measured in any indexed paper we found.

In an open study of 91 people with indigestion after treatment for H. pylori, a supplement mixing pineapple, papaya, ginger, fennel and alginate improved a symptom score by 1.78 points, while the score of those not taking it worsened by 0.08. There was no randomization and no placebo, and with seven ingredients the share owed to pineapple cannot be separated. A 2024 review says bromelain may aid digestion in pancreatic insufficiency or with high-protein meals, citing one source and giving no size of effect.

Juice before a medical procedure

In 19 patients with obesity, the 11 who drank 1.1 quarts (1 L) of 100 percent pineapple juice a day for 3 days before their stomach balloon was removed had no food left in the stomach. The comparison was the 8 patients treated before the juice was introduced, with no randomization. A liter a day is a large dose of sugar, and nobody has tried it in people with ordinary indigestion.

Who should be careful

Not for everyone. Bromelain capsules upset the gut they are sold for. A 2023 systematic review of seven randomized trials at 200 to 1200 mg a day for 1 to 16 weeks found side effects in 11 participants, mainly gastrointestinal, and two stopped treatment. That review did no meta-analysis, and its doses are supplement doses. The US National Center for Complementary and Integrative Health names stomach upset and diarrhea as the most common side effects.

If you take a blood thinner, a 2024 narrative review notes reports of bleeding risk with bromelain, especially with warfarin and clopidogrel, along with diarrhea, nausea, vomiting and allergic reactions in trials. In laboratory tests, pineapple juice at 5 percent by volume almost completely blocked CYP2C9, a liver enzyme that clears warfarin and some painkillers. That has not been confirmed in people, and the one registered human trial, with diclofenac, has no results. Ask a pharmacist before taking bromelain alongside these drugs.

Little is known about whether bromelain is safe during pregnancy or breastfeeding, according to the same US center. That statement is about the supplement. We found no data either way on ordinary amounts of the juice in pregnancy.

What expert bodies say

The US National Center for Complementary and Integrative Health lists bromelain's side effects and gives no digestive use among them. In the European Union no health claim is authorized for pineapple juice, and a claim that pineapple powder with bromelain helps slimming was refused. A refusal means the evidence submitted was not enough. It does not mean an effect was ruled out.

If constipation or indigestion lasts more than a few weeks, it is worth seeing a doctor before trying another drink. More on the drink itself is on the pineapple juice page.

How we searched

What would change this answer

• A randomized placebo-controlled trial of 100 percent pineapple juice on stool frequency or indigestion symptoms. None was registered on ClinicalTrials.gov on 7 October 2026.
• A comparison of fresh with pasteurized juice, which is in effect a test of juice with and without active bromelain.
• A measurement of active bromelain in juice sold in shops, published where it can be checked.
• A human study of whether pineapple juice changes blood levels of drugs cleared by CYP2C9.

Sources

1. ev-pjd-01 · Meta-analysis or systematic review · systematic review and meta-analysis · n = 23 studies (17 RCTs), 1714 participants
   We included 23 studies (17 RCTs, 6 uncontrolled; 1714 participants): kiwifruit (n = 7), high-mineral water (n = 4), prunes (n = 2), rye bread (n = 2), mango, fig, cereal, oat bran, yoghurt, water supplementation, prune juice, high-fibre diet, no-fibre diet (n = 1).
   
   Who: intervention trials (RCTs, non-randomized, uncontrolled) of foods, drinks and diets in adults with chronic constipation, searched to July 2023
   Effect: no pineapple or pineapple juice studies; the only juice tested was prune juice (n = 1 study)
   Certainty: The absence of pineapple is from the list of interventions in the abstract; children are not covered.
   Aliment Pharmacol Ther, 2024 · checked 2026-10-07 · we read the abstract
2. ev-pjd-02 · Meta-analysis or systematic review · systematic review and network meta-analysis of RCTs · n = 19 RCTs
   For defecation frequency, fruit-based foods (category 1) were better than fiber supplements (moderate certainty), mineral water (low certainty), and placebo (moderate certainty).
   
   Who: RCTs of dietary interventions in patients with functional constipation, searched to 20 August 2025
   Effect: fruit-based foods better than fiber supplements (moderate certainty), mineral water (low) and placebo (moderate) for defecation frequency
   Certainty: Which fruits is not named in the abstract, no full text in PMC (no_pmc); there is no pineapple juice among the known studies of fruit in constipation (ev-pjd-01).
   Am J Clin Nutr, 2026 · checked 2026-10-07 · we read the abstract
3. ev-pjd-03 · Observational data · placebo-controlled intervention study, allocation method not described · n = 60
   In contrast, GBP and PFP improved all frequencies tested, even at early stages (days 0 to 7) of the study.
   
   Who: adults split into control (placebo 10.75 g), green banana powder (10.75 g) or pineapple fiber powder (7.41 g) groups, each giving 5 g fiber a day, for 14 days
   Effect: pineapple fiber powder improved all bowel frequencies tested from day 0 to 7; no constipation or diarrhea reported
   Certainty: Randomization not named in Methods, hence C; pomace is exactly what removes the juice; the powder manufacturer is the sponsor (Dole).
   Front Nutr, 2024, Effect of green banana and pineapple fibre powder consumption on host gut microbiome · checked 2026-10-07 · we read the fulltext
4. ev-pjd-04 · Observational data · placebo-controlled intervention study, allocation method not described · n = 60
   After 7 days, normal stool was reported by 65% of control participants versus 79% of GBP participants and 44% of PFP participants.
   
   Who: adults taking placebo, green banana powder or pineapple fiber powder for 14 days
   Effect: normal stool at day 7: control 65%, green banana 79%, pineapple fiber 44%; Bristol type 3-4 by day 14 in both powder groups
   Certainty: Self-report, small groups (~20), no statistics given for the share of normal stool.
   Front Nutr, 2024, Effect of green banana and pineapple fibre powder consumption on host gut microbiome · checked 2026-10-07 · we read the fulltext
5. ev-pjd-05 · Position of an expert body · reference datasets · n = 2 records
   Pineapple juice, 100% (fdc_id 2709329): Fiber, total dietary 0.2 g per 100 g. Pineapple, canned, juice pack (fdc_id 2709263): Fiber, total dietary 0.8 g per 100 g. Pineapple juice, unsweetened (CoFID 2021, code 14-286): AOAC fibre Tr; NSP Tr; Fructose 2.9 g; Glucose 2.9 g per 100 g
   
   Who: USDA FNDDS survey food Pineapple juice, 100% (FDC 2709329); CoFID 2021 code 14-286 Pineapple juice, unsweetened
   Effect: fiber 0.2 g/100 g (FNDDS) vs 0.8 g/100 g for canned pineapple in juice (FDC 2709263); CoFID AOAC fiber Tr, NSP Tr, fructose 2.9 g, glucose 2.9 g per 3.5 oz (100 g)
   Certainty: Equal fructose/glucose means no excess of free fructose (the mechanism of apple juice); no sorbitol in the datasets.
   USDA FNDDS, FoodData Central survey food 2709329 and 2709263; CoFID 2021 (PHE, OGL v3.0) code 14-286 · checked 2026-10-07 · we read the dataset
6. ev-pjd-06 · Randomized controlled trial(s) · randomized triple-blind placebo-controlled trial · n = 70
   The bromelain group had considerably higher changes in their SCCAI score in comparison with the placebo group (-3.29 ± 2.17 vs. -1.11 ± 1.71; p < 0.001).
   
   Who: individuals with mild-to-moderate ulcerative colitis, 400 mg bromelain daily or maltodextrin placebo for eight weeks
   Effect: SCCAI change -3.29 +/- 2.17 vs -1.11 +/- 1.71 (p < 0.001); QoL change 3.76 vs 3.91 (p = 0.90)
   Certainty: Bromelain supplement, not juice; how much active bromelain remains in pasteurized juice was not measured by the source with the PMID (see the log).
   Sci Rep, 2025 · checked 2026-10-07 · we read the abstract
7. ev-pjd-07 · Observational data · open non-randomized multicentre prospective study · n = 91
   The VAS scale of those who took Perdiges improved on average by 1.78 points versus a worsening of 0.08 points of those who did not take it (P<0.0001).
   
   Who: consecutive patients with functional dyspepsia after H. pylori eradication, treated with Perdiges (n = 55) or not (n = 36), 30 days
   Effect: VAS improved 1.78 points vs worsening 0.08 (P < 0.0001); PPI abstention 100% vs 86.1% (P = 0.008)
   Certainty: Open-label, no randomization or placebo; a mixture of seven components, the contribution of pineapple cannot be isolated.
   Minerva Gastroenterol Dietol, 2014 · checked 2026-10-07 · we read the abstract
8. ev-pjd-08 · Meta-analysis or systematic review · systematic review of RCTs · n = 7 RCTs
   Eleven (11) participants experienced side effects, and two discontinued treatment in the studies. The reported adverse effects were mainly gastrointestinal but well tolerated.
   
   Who: adults in RCTs of bromelain alone or combined, 200 to 1200 mg a day for 1 to 16 weeks
   Effect: 11 participants with side effects, 2 discontinuations; adverse effects mainly gastrointestinal
   Certainty: No meta-analysis; supplement doses are tens of times higher than in a glass of juice.
   Clin Nutr ESPEN, 2023 · checked 2026-10-07 · we read the abstract
9. ev-pjd-09 · Position of an expert body · agency consumer fact sheet
   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 juice; NCCIH does not list digestive indications among the stated ones.
   NIH National Center for Complementary and Integrative Health, Bromelain (last updated November 2024) · checked 2026-10-07 · we read the section
10. ev-pjd-10 · Position of an expert body · agency consumer fact sheet
    Little is known about whether it's safe to use bromelain during pregnancy or while breastfeeding.
    
    Who: pregnant or breastfeeding women
    Effect: safety unknown
    Certainty: About a supplement; there are no separate data for a normal amount of juice as food (axis 9).
    NIH National Center for Complementary and Integrative Health, Bromelain (last updated November 2024) · checked 2026-10-07 · we read the section
11. ev-pjd-11 · Laboratory or animal data · narrative review
    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: The review retells other works; it also says there that bromelain is not recommended for those taking anticoagulants or antiplatelet agents.
    Children (Basel), 2024, Current Uses of Bromelain in Children: A Narrative Review · checked 2026-10-07 · we read the fulltext
12. ev-pjd-12 · Laboratory or animal data · narrative review
    At the gastrointestinal level, bromelain may aid digestion in individuals affected by digestive disorders or pancreatic insufficiency, especially with high-protein meals [24].
    
    Who: people with digestive disorders or pancreatic insufficiency
    Effect: possible digestive aid; no effect size
    Certainty: A single reference [24]; neither an RCT nor an MA of bromelain or juice for digestion was found (axis 9).
    Children (Basel), 2024, Current Uses of Bromelain in Children: A Narrative Review · checked 2026-10-07 · we read the fulltext
13. pnju-daily-r5-05 · Observational data · uncontrolled clinical study · n = 19
    The next 11 patients were also advised to drink 1 liter per day of 100% pineapple juice for 3 days before the endoscopic removal. ... In the other 11 patients, no food remnants were observed after taking pineapple juice prior to the endoscopic removal procedure.
    
    Who: 19 obese patients (17 female, 2 male) undergoing intragastric balloon removal
    Effect: no undigested food at endoscopy after pineapple juice, vs remnants in the first 8 patients before juice
    Certainty: no randomization and no control; 1 L/day is a large dose of sugar
    Turk J Gastroenterol, 2013 · checked 2026-09-29 · we read the abstract
14. pnju-daily-r5-06 · Laboratory or animal data · in vitro study · n = —
    Among the fruits, pineapple juice showed potent inhibition of CYP2C9 activity. The addition of 25 microl (5.0% v/v) of pineapple juice resulted in almost complete inhibition.
    
    Who: human liver microsomes, in vitro
    Effect: 5.0% v/v pineapple juice almost completely inhibited CYP2C9 activity
    Certainty: in vitro; clinical trial NCT01649492 (diclofenac) without results; pasteurized juice may have less active bromelain
    Biosci Biotechnol Biochem, 2008 · checked 2026-09-29 · we read the abstract
15. pnju-daily-r5-08 · Position of an expert body · reference datasets · n = 2 records
    Pineapple juice, unsweetened (CoFID 2021, code 14-286): Energy 41 kcal; Total sugars 10.5 g; Vitamin C 11 mg; Potassium 53 mg per 100 g. Pineapple juice, 100% (fdc_id 2709329): Energy 53 kcal; Total Sugars 9.98 g; Vitamin C 43.8 mg per 100 g
    
    Who: CoFID 2021 record 14-286 and FNDDS 64124020
    Effect: CoFID: 41 calories, sugars 10.5 g, vitamin C 11 mg, potassium 53 mg; FNDDS: 53 calories, sugars 9.98 g, vitamin C 43.8 mg per 3.5 oz (100 g)
    Certainty: fourfold gap in vitamin C: probably added ascorbic acid in American juices; USDA SR 5 entries 10-43.8 mg
    CoFID 2021 (PHE, OGL v3.0) code 14-286; USDA FNDDS survey food 2709329 · checked 2026-09-29 · we read the dataset
16. pnju-daily-r5-09 · Position of an expert body · USDA survey food composition dataset · n = —
    Pineapple juice, 100% (fdc_id 2709329): Quantity not specified 248 g = 131.4 kcal, Total Sugars 24.8 g, Vitamin C 108.6 mg; 1 individual school container 124 g = 65.7 kcal, Total Sugars 12.4 g
    
    Who: FNDDS survey food Pineapple juice, 100% (code 64124020, FDC 2709329)
    Effect: 248 g = 131.4 calories, 24.8 g sugars, 108.6 mg vitamin C; 124 g school container = 65.7 calories, 12.4 g sugars
    Certainty: serving converted from 100 g
    USDA FNDDS, FoodData Central survey food 2709329 · checked 2026-09-29 · we read the dataset
17. pnju-daily-r5-11 · Position of an expert body · regulatory register entry · 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: EU labeling rule
    Effect: non-authorized claim
    Certainty: refusal = there was not enough evidence, not "no effect"; 21 CFR is empty by name
    EU Register on nutrition and health claims, claim POL-HC-6600, snapshot 2026-09-21 · checked 2026-09-29 · we read the section