Does avocado help with constipation?

Nobody has tested it. We found no randomized trial of avocado in people with constipation and no systematic review that covers it. A 2024 meta-analysis of 23 food studies in 1714 adults with chronic constipation included kiwifruit, prunes, mango, figs and rye bread, and no avocado. Fruit in that review raised stool frequency by 0.36 bowel movements a week more than the fiber supplement psyllium. What avocado does have is fiber: one raw fruit of 5.3 oz (150 g) carries about 10 g, by the US food composition table.

Unsettled. The fiber is a reason to expect some effect on the bowel, and it is not evidence of one. The two avocado trials that exist measured fiber intake and gut bacteria in people not recruited for constipation, and neither reported how often anyone went.

What the trials found

Fruit for constipation, with no avocado in it

The 2024 meta-analysis pooled 17 randomized and 6 uncontrolled trials, searched up to July 2023. Fruit beat psyllium by 0.36 bowel movements a week, with an interval from 0.25 to 0.48, in 232 people. Kiwifruit carried most of that result. Prunes did no better than psyllium. We could not get the full text, and the list of included foods in the abstract is how we know avocado was absent.

Avocado and fiber, in people without constipation

In a 12-week randomized trial of 163 adults with overweight, one meal a day with 6.2 oz (175 g) of avocado for men or 140 g for women, against a matched meal without it, added 14 g of fiber a day. Stool frequency and consistency were not measured, and the participants were not constipated.

Avocado and gut bacteria

In a 26-week sub-study of a randomized trial in 230 adults with abdominal obesity, one avocado a day raised the diversity of gut bacteria from week 4 onwards, against the usual diet. Bowel habits were not reported. A more varied gut flora is not the same outcome as relief from constipation.

How much fiber is in it

The USDA survey food table gives raw avocado 6.7 g of fiber per 3.5 oz (100 g). That is 10.1 g in a whole fruit of 150 g and 1.0 g in a 15 g slice, so a few slices on toast add little.

Who should be careful

Not for everyone. Babies being weaned who have food protein-induced enterocolitis syndrome, a food allergy that causes repeated vomiting and diarrhea. In 74 US children with it at one hospital in Texas, avocado was a trigger in 16 percent. Among 146 Asian American children with it in Northern California, avocado was the fourth most common trigger, in 9.6 percent.

Avocado also sits in a cluster of fruits that cross-react in allergy. In 53 adults at an allergy clinic who reported reactions to melon, food challenges confirmed reactions to other fruits, and avocado was linked in 7, as often as banana and more often than kiwi or peach. These were selected patients, so the figure says nothing about how common this is in everyone.

For people whose problem runs the other way, a UK survey of 434 adults with bile acid diarrhea found avocado among the foods least often blamed for loose stools, reported by between 3.7 and 7.4 percent for the lowest five foods. That was self-report with no food challenge.

What expert bodies say

The NIH digestive diseases institute, NIDDK, lists fiber-rich fruits for constipation as berries, apples with the skin on, oranges and pears, and advises adding fiber a little at a time. Avocado is not on the list. The page is patient advice without its own analysis and was last reviewed in May 2018. We found no other agency statement on avocado and constipation.

How we searched

What would change this answer

• A randomized trial of avocado against a control in adults with chronic constipation, reporting how often people go and stool form.
• Results from a registered avocado trial in Illinois, of about 45 people, that lists stool frequency and the Bristol stool scale as secondary outcomes. Its status is unknown and it has not reported.

More on the fruit itself is on the avocado page, and on fiber in general in the fiber guide.

Sources

1. ev-avcon-01 · Meta-analysis or systematic review · systematic review and meta-analysis, RCT data synthesized · n = 1714
   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). Fruits resulted in higher stool frequency than psyllium (MD: +0.36 bowel movements [BM]/week, [0.25-0.48], n = 232), kiwifruits in particular (MD: +0.36 BM/week, [0.24-0.48], n = 192); there was no difference for prunes compared with psyllium.
   
   Who: adults with chronic constipation in RCTs and uncontrolled trials
   Effect: fruits vs psyllium MD +0.36 BM/week (0.25 to 0.48), n=232, mainly kiwifruit; foods studied: kiwifruit, prunes, rye bread, mango, fig and others, no avocado
   Certainty: Avocado absence shown by the list of included foods; search to July 2023. Full text no_pmc.
   Aliment Pharmacol Ther, 2024 · checked 2026-10-07 · we read the abstract
2. ev-avcon-02 · Randomized controlled trial(s) · randomized controlled trial, investigator-blinded, isocaloric meals with or without avocado · n = 163
   As intended, participants in the avocado group reported MUFA consumption that was ∼20 g greater than the control group and 14 g of additional dietary fiber.
   
   Who: adults 25-45 y, BMI 25 or more; 175 g avocado (men) or 140 g (women) daily in one replaced meal
   Effect: +14 g/d dietary fiber vs control; fecal acetate +18%; Faecalibacterium, Lachnospira, Alistipes +26% to 65%; bowel habits not reported
   Certainty: Participants were not constipated; stool frequency and consistency were not outcomes. Fiber figure from Results of PMC8030699.
   J Nutr, 2021 · checked 2026-10-07 · we read the fulltext
3. ev-avcon-03 · Randomized controlled trial(s) · ancillary study of a multicentre randomized controlled trial (HAT, n=1008) · n = 230
   Compared to the HAB group, the AVO group had higher alpha diversity by 4 weeks, which persisted through the 26-week study period.
   
   Who: adults with abdominal obesity, HAT trial UCLA site; one avocado per day vs habitual diet
   Effect: higher alpha diversity from week 4 through week 26; more F. prausnitzii at week 26; no difference in metabolic pathways; bowel habits not reported
   Certainty: Microbiota outcome only, not constipation; full text no_pmc.
   Food Funct, 2025 · checked 2026-10-07 · we read the abstract
4. ev-avcon-04 · Observational data · national food composition dataset · n = —
   Avocado, raw, FNDDS code 63105010, fdc_id 2709223: Fiber, total dietary 6.7 G per 100 g; 1 fruit 150 g, 10.1 G; 1 slice 15 g, 1.0 G
   
   Who: food composition, US survey food code
   Effect: fiber 6.7 g/100 g; 1 fruit or 1 cup 150 g = 10.1 g; 1 slice 15 g = 1.0 g; mashed cup 230 g = 15.4 g
   Certainty: Fiber content is a reason to expect a laxative effect, not proof of one; no trial measured it.
   USDA FNDDS, food code 63105010, Avocado, raw (fdc_id 2709223) · checked 2026-10-07 · we read the dataset
5. ev-avcon-05 · Position of an expert body · agency patient guidance · n = —
   fruits, such as berries, apples with the skin on, oranges, and pears
   
   Who: people with constipation (US patient guidance)
   Effect: fruit examples: berries, apples with the skin on, oranges, pears; add fiber a little at a time
   Certainty: Patient advice without its own analysis; page last reviewed May 2018.
   NIDDK, Eating, Diet, & Nutrition for Constipation (NIH) · checked 2026-10-07 · we read the section
6. ev-avcon-06 · Observational data · retrospective cohort · n = 74
   Banana (24%) and avocado (16%) rates were also much higher than in other studied populations, likely a reflection of different dietary and weaning habits in our area.
   
   Who: children with FPIES at Texas Children's Hospital
   Effect: avocado 16%, banana 24%, rice 53% of patients
   Certainty: Single tertiary center; FPIES causes repeated vomiting and diarrhea in infants after weaning foods.
   Ann Allergy Asthma Immunol, 2019 · checked 2026-10-07 · we read the abstract
7. ev-avcon-07 · Observational data · retrospective cohort, chart review · n = 146
   The most common culprit foods included egg (36.3%), oats (24%), milk (16.4%), avocado (9.6%), rice (6.8%), and peanut (5.5%).
   
   Who: Asian American children under 18 with FPIES, Northern California health system, 2015-2022
   Effect: egg 36.3%, oats 24%, milk 16.4%, avocado 9.6%, rice 6.8%, peanut 5.5%
   Certainty: One health system; diagnosis by ICD code and allergist chart review.
   Ann Allergy Asthma Immunol, 2026 · checked 2026-10-07 · we read the abstract
8. ev-avcon-08 · Observational data · challenge study; avocado reactions from open and blinded challenges, not randomized · n = 53
   The most common foods associated with melon allergy were avocado (n = 7), banana (n = 7), kiwi (n = 6), watermelon (n = 6), and peach (n = 5).
   
   Who: adults reporting adverse reactions to melon; open then double-blind placebo-controlled food challenges
   Effect: melon allergy confirmed in 19 of 53; associated confirmed reactions: avocado 7, banana 7, kiwi 6, watermelon 6, peach 5
   Certainty: Selected allergy clinic patients; shows avocado in the fruit cross-reaction cluster.
   J Allergy Clin Immunol, 2000 · checked 2026-10-07 · we read the abstract
9. ev-avcon-09 · Observational data · cross-sectional survey, self-report · n = 434
   Lowest frequencies were for potato, avocado, mango, watermelon and pear (range 3.7%-7.4%) for the foods listed in the questionnaire.
   
   Who: UK adults with SeHCAT-confirmed bile acid diarrhea, online questionnaire on 39 foods
   Effect: lowest diarrhea frequencies for potato, avocado, mango, watermelon and pear (3.7% to 7.4%); highest for take-away food, creamy sauces (41.0% to 33.6%)
   Certainty: Self-reported perceptions, no challenge; says little about constipation, mostly that avocado was rarely blamed for loose stools.
   J Hum Nutr Diet, 2024 · checked 2026-10-07 · we read the abstract