Avocado or banana: blood fats for one, toddler diarrhea for the other

These two fruits get compared for potassium, but the strongest evidence for each is about something else. For avocado it is blood fats. In a meta-analysis of 10 randomized trials with 229 people, diets that included avocado lowered LDL cholesterol by 16.5 mg/dL (95% CI 10.1 to 22.9) and triglycerides by 27.2 mg/dL. The trials disagreed with each other a good deal, and the drop was largest where avocado replaced other fats instead of being added on top. For banana it is sick toddlers. In a meta-analysis of 9 trials with 3996 children aged 8 to 34 months, green, unripe banana given alongside standard care nearly doubled the rate at which diarrhea cleared (HR 1.96, 95% CI 1.62 to 2.37), though 7 of the 9 trials were open label. Every patient was a small child, and the food was green banana. On potassium, avocado carries more by weight: USDA measured 576 mg per 3.5 oz (100 g) in Hass avocado and 326 mg in ripe banana.

How much is actually in it

• USDA measured Hass avocado at 576 mg potassium per 3.5 oz (100 g) across 8 samples and ripe banana at 326 mg across 6 samples, so avocado carries more potassium per gram. — USDA FoodData Central Foundation Foods, Avocado, Hass, peeled, raw and Bananas, ripe and slightly ripe, raw, release 2026-04-30 (n = 14) Evidence E source
  Potassium: avocado 576.4 mg (528-623); banana 326.0 mg (300-355); avocado fat 20.31 g (18.76-21.83); banana fiber 1.7 g (1.1-2.2, 10 samples)
• UK CoFID 2021 lists Hass avocado flesh at 171 calories, 17.4 g fat and 0.4 g sugars per 3.5 oz (100 g), and banana flesh at 81 calories, 0.1 g fat and 18.1 g sugars. — CoFID 2021 codes 14-386 Avocado, Hass, flesh only and 14-318 Bananas, flesh only Evidence E source
  Avocado 171 calories, fat 17.4 g, AOAC fiber 3.1 g, sugars 0.4 g, potassium 583 mg; banana 81 calories, fat 0.1 g, AOAC fiber 1.4 g, sugars 18.1 g, potassium 330 mg

What a real portion looks like

• In the USDA survey food table one raw avocado weighs 5.3 oz (150 g) and one raw banana 126 g, so a whole avocado has about 860 mg potassium against about 410 mg in a banana. — USDA FNDDS, Avocado, raw (food code 63105010) and Banana, raw (food code 63107010) Evidence E source
  Avocado 1 fruit 150 g, 1 cup mashed 230 g; banana 1 banana 126 g, 1 cup mashed 225 g; potassium per fruit computed from USDA Foundation per-100 g values

What your body absorbs

• In two crossover trials with 12 adults each, adding Hass avocado to a meal raised beta-carotene absorption 2.4-fold from tomato sauce and 6.6-fold from raw carrots. — Two separate sets of 12 healthy men and women; 2 randomized, 2-way crossover studies (n = 24) Evidence B source
  Beta-carotene absorption x2.4 (sauce) and x6.6 (carrots); alpha-carotene x4.8; conversion to vitamin A x4.6 and x12.6
• In a controlled crossover study in 8 men, a freshly made banana smoothie cut peak blood flavan-3-ol levels by 84% compared with capsules, while a berry smoothie did not. — healthy men (n = 8) (n = 8) Evidence B source
  Cmax 96 +/- 47 nmol/L after high-PPO banana drink vs 680 +/- 78 nmol/L after capsule (84% lower)
• In a 6-month RCT in 40 healthy adults, one avocado a day raised serum lutein by 25% and increased macular pigment density, unlike potato or chickpea controls. — Healthy subjects consumed one avocado (n = 20) vs. one potato or one cup of chickpeas (n = 20) (n = 40) Evidence B source
  Serum lutein +25% from baseline at 6 months (p = 0.001) vs +15% in controls; MPD increased only with avocado

What cooking and storage change

• A systematic review of 15 small trials links unripe banana flour, a resistant starch source, with lower fasting glucose, HOMA-IR and body weight in adults. — Studies (n = 15; sample sizes 10-154; durations 3 days-12 weeks) Evidence C source
  Direction only: reduction in fasting glucose, HOMA-IR, body weight; no pooled size
• By the USDA retention table for fresh fruits, baking keeps about 90% of potassium, 80% of vitamin C and 60% of folate. — USDA Table of Nutrient Retention Factors, Release 6, group Fruits and Fruit Juices, Retn_Code 151 Evidence E source
  Potassium 90%, vitamin C 80%, thiamin 80%, folate 60%, vitamin B6 95%, magnesium 100% retained

What it does to your health

• In a meta-analysis of 10 trials with 229 people, avocado-substituted diets lowered total cholesterol by 18.8 mg/dL, LDL by 16.5 mg/dL and triglycerides by 27.2 mg/dL. — Ten unique studies (n = 229) (n = 229) Evidence A source
  TC -18.80 mg/dL (95% CI -24.56 to -13.05); LDL-C -16.50 mg/dL (95% CI -22.91 to -10.10); TG -27.20 mg/dL (95% CI -44.41 to -9.99); HDL -0.18 mg/dL, not significant
• A meta-analysis of 18 studies of mixed design with 481 people links avocado intake with HDL cholesterol 2.84 mg/dL higher and no change in total or LDL cholesterol. — 18 eligible studies (481 subjects) (n = 481) Evidence C source
  HDL +2.84 mg/dL (95% CI 0.18 to 5.49), significant heterogeneity; no difference in TC, LDL-C, TG, body weight
• In a crossover RCT in adults with high triglycerides, swapping solid fats and added sugars for one avocado a day for 3 weeks cut triglycerides by 17.4% and non-HDL cholesterol by 4.65%. — healthy adults with elevated triglycerides (TG, 135-499 mg/dL); 42 randomly assigned; two 3-wk periods (n = 42) Evidence B source
  Non-HDL -4.65% (95% CI -9.01% to -0.08%); VLDL-C -9.30%; TG -17.4% (95% CI -25.0% to -8.99%); glucose, insulin, blood pressure not different

Safety, limits and interactions

• A case report describes a man on warfarin whose INR fell below target after dried banana flakes were started for diarrhea, rated a probable interaction. — A man in his 30s on warfarin with diarrhea (n = 1) Evidence D source
  Subtherapeutic INR for 3 days; Drug Interaction Probability Scale score 5 (probable)
• Among 53 adults reporting melon reactions, avocado and banana were the most common co-allergens, each confirmed in 7 patients by food challenge. — Fifty-three consecutive adult patients complaining of adverse reactions to melon (n = 53) Evidence C source
  Associated confirmed reactions: avocado n = 7, banana n = 7, kiwi n = 6
• In four banana-allergic patients, two were also sensitized to latex, avocado and kiwi, and banana allergy was confirmed by blinded food challenge. — four patients who complained about symptoms after banana consumption (n = 4) Evidence D source
  2 of 4 co-sensitized to latex, avocado, kiwi and birch pollen; 2 DBPCFC positive
• NIH advises that potassium-sparing diuretics such as spironolactone can cause high blood potassium, which matters for potassium-rich foods like avocado and banana. — people taking potassium-sparing diuretics Evidence E source
  Risk of hyperkalemia; monitoring advised

What people believe that the data does not support

• The EU register lists the claim that banana is a major dietary source of antioxidants that protect cells from oxidative damage as non-authorized. — EU Register on nutrition and health claims, snapshot 2026-09-21 Evidence E source
  Status Non-authorized
• The EU register lists the claim that avocado-soy extract gives natural flexibility to the joints and builds cartilage as non-authorized. — EU Register on nutrition and health claims, snapshot 2026-09-21 Evidence E source
  Status Non-authorized

Who this works differently for

• In a meta-analysis of 9 RCTs with 3996 children aged 8 to 34 months, green banana food alongside standard care nearly doubled the rate of diarrhea resolution (HR 1.96). — pediatric population comprising a total of 3996 patients aged 8 to 34 months; nine randomized controlled trials (n = 3996) Evidence A source
  HR 1.96 (95% CI 1.62 to 2.37), I2 = 52%; persistent diarrhea HR 2.34 (1.78 to 3.08); acute HR 1.74 (1.45 to 2.09)
• In an open-label RCT, children with acute watery diarrhea given cooked green banana recovered within 72 hours more often than controls (62.4% vs 47.2%, RR 1.3). — children aged 9 months to 5 years with acute watery diarrhea within 48 hours of onset, no dehydration Evidence B source
  Recovery at 72 h 62.4% vs 47.2%, RR 1.3 (95% CI 1.05-1.7), NNT 7
• In a Finnish birth cohort of 2272 mother-child pairs, eating any avocado in pregnancy was linked with 43.6% lower odds of food allergy in the child at 12 months. — Of 4647 participants, 2272 met the criteria and were included in the analysis (n = 2272) Evidence C source
  43.6% lower odds of reported infant food allergy (adjusted); no association for rhinitis, wheezing, eczema
• In the EPIC cohort of 341,519 adults followed for 13 years, pooled intake of apple, pear, banana, mushrooms and onion was linked with lower Crohn's disease risk (HR 0.58). — 341,519 individuals followed prospectively; median follow-up of 13.4 years (n = 341519) Evidence C source
  AHR 0.58 (95% CI 0.33-1.02), P trend 0.03, fourth vs first quartile

What is still unknown

• A 2025 scoping review of avocado research names gaps in European, Asian, younger and older populations, dose-response designs and longer interventions. — scoping review and evidence map of avocado consumption and health Evidence C source
  Research gaps named, no effect size

The bottom line

Per fruit, the potassium gap is a calculation from those figures and portion weights, not a measurement. A 150 g avocado works out at about 860 mg and a 126 g banana at about 410 mg, so half an avocado gives roughly what a banana does. The calories are far apart. UK tables list avocado flesh at 171 calories and 17.4 g fat per 3.5 oz (100 g), and banana at 81 calories with 18.1 g sugars. Avocado also works as a carrier for fat soluble pigments. In two crossover studies of 12 healthy adults each, adding a Hass avocado that brought 23 g of fat to a single meal raised beta-carotene absorption 2.4-fold in one study and 6.6-fold in the other. Banana pulls the other way on some plant compounds. In 8 healthy men, a banana smoothie left peak blood flavan-3-ol levels 84% lower than the same flavan-3-ols in a capsule, an effect the authors tie to the banana enzyme polyphenol oxidase. Eight people is a very small study. Two avocado findings are less settled than the lead. A second meta-analysis of 18 studies with 481 people linked avocado with HDL cholesterol 2.84 mg/dL higher (95% CI 0.18 to 5.49) and found no change in LDL. It mixed trials with other designs, which is why its LDL answer differs from the randomized one above. In a 3-week crossover trial in 42 adults with raised triglycerides, about one avocado a day in place of solid fats and added sugars cut triglycerides by 17.4% (95% CI 9.0 to 25.0) and non-HDL cholesterol by 4.65%. Three weeks says nothing about heart attacks. In a 6-month trial in 40 healthy adults, one avocado a day raised blood lutein by 25% against 15% in controls eating potato or chickpeas, and only the avocado group gained macular pigment. Unripe banana flour is a separate product from the fruit. A review of 15 small trials, lasting 3 days to 12 weeks, links its resistant starch with lower fasting glucose and body weight, without a pooled size. Baking fresh fruit keeps about 90% of the potassium and 80% of the vitamin C by the USDA retention table, which covers fruit as a group and not these two in particular. Who should be careful. Allergy is the real issue for both fruits. Among 53 adults who reported reactions to melon, food challenges confirmed avocado allergy in 7 and banana allergy in 7. In a case series of 4 banana-allergic patients, 2 were also sensitized to latex, avocado and kiwi. One man on warfarin saw his INR fall below target for 3 days after starting dried banana flakes for diarrhea, which a standard scale rated a probable interaction. That is one case. NIH warns that potassium-sparing diuretics such as spironolactone can cause high blood potassium and advises monitoring potassium, especially in people with impaired kidney function. The warning is about potassium in general, and it matters for these fruits only through their potassium content. Two claims failed in the EU register. Banana as a major source of protective antioxidants was not authorized. A joint cartilage claim was refused too, and it was made for an avocado-soy extract, never for the fruit. A refusal means the evidence fell short when it was assessed. The rest is association. In a Finnish cohort of 2272 mother and child pairs, eating any avocado in pregnancy went with 43.6% lower odds of parent-reported food allergy at 12 months. In 341,519 European adults, a pooled score of apple, pear, banana, mushrooms and onion was linked with lower Crohn's disease risk (HR 0.58), with a confidence interval of 0.33 to 1.02 that reaches no effect. We found no trial that compared avocado with banana head to head.

Sources

1. avba-daily-r3-16 · food composition dataset
   Avocado, Hass, peeled, raw | Potassium, K | 576.4 MG | range 528.0-623.0, median 575.5, 8 samples, spread 16% || Total lipid (fat) | 20.31 G | range 18.76-21.83, median 20.09, 8 samples, spread 15% || Bananas, ripe and slightly ripe, raw | Potassium, K | 326.0 MG | range 300.0-355.0, median 326.0, 6 samples, spread 17% || Fiber, total dietary | 1.7 G | range 1.1-2.2, median 1.7, 10 samples, spread 65%
   USDA FoodData Central, Foundation Foods, release 2026-04-30 · checked 2026-10-03
2. avba-daily-r3-17 · food composition dataset
   14-386 Avocado, Hass, flesh only | Energy (kcal) 171 | Fat (g) 17.4 | AOAC fibre (g) 3.1 | Total sugars (g) 0.4 | Potassium (mg) 583 || 14-318 Bananas, flesh only | Energy (kcal) 81 | Fat (g) 0.1 | AOAC fibre (g) 1.4 | Total sugars (g) 18.1 | Potassium (mg) 330
   CoFID 2021, Public Health England, Open Government Licence v3.0 · checked 2026-10-03
3. avba-daily-r3-18 · survey food dataset
   Avocado, raw | FNDDS code 63105010 | fdc_id 2709223 | 1 fruit 60813 = 150 g | 1 cup, mashed or pureed 10119 = 230 g || Banana, raw | FNDDS code 63107010 | fdc_id 2709224 | 1 banana 60343 = 126 g | 1 cup, mashed 10118 = 225 g
   USDA FNDDS (survey foods) · checked 2026-10-03
4. avba-daily-r3-06 · RCT (crossover)
   Two separate sets of 12 healthy men and women were recruited for 2 randomized, 2-way crossover studies. One meal was served with fresh avocado (Persea americana Mill), cultivated variety Hass (delivering 23 g of lipid), and a second meal was served without avocado. ... Consumption of lipid-rich avocado enhanced the absorption of β-carotene from study 1 by 2.4-fold (P < 0.0001). In study 2, the absorption of β-carotene and α-carotene increased by 6.6- and 4.8-fold, respectively (P < 0.0001 for both).
   J Nutr, 2014 · checked 2026-10-03
5. avba-daily-r3-07 · crossover trial
   a controlled, single blinded and cross-over study was conducted in healthy men (n = 8) who consumed a flavan-3-ol-containing banana-based smoothie (high-PPO drink), a flavan-3-ol-containing mixed berry smoothie (low-PPO drink) and flavan-3-ols in a capsule format (control). ... In contrast, the intake of the high PPO drink resulted in a Cmax of 96 ± 47 nmol L-1, 84% lower than that obtained after capsule intake.
   Food Funct, 2023 · checked 2026-10-03
6. avba-daily-r3-08 · RCT
   This was a six-month, randomized, controlled trial. Healthy subjects consumed one avocado (n = 20, 0.5 mg/day lutein, AV) vs. one potato or one cup of chickpeas (n = 20, 0 mg/day lutein, C). ... At six months, AV increased serum lutein levels by 25% from baseline (p = 0.001). C increased by 15% (p = 0.030). At six months, there was an increase in MPD from baseline in AV (p = 0.001) and no increase in C.
   Nutrients, 2017 · checked 2026-10-03
7. avba-daily-r3-09 · systematic review
   Studies (n = 15; sample sizes 10-154; durations 3 days-12 weeks) demonstrated heterogeneous dosing and formulations. ... UBF resistant starch was associated with reduction in fasting glucose, HOMA-IR, and body weight, although findings are based on small, short-duration trials.
   J Nutr Sci, 2026 · checked 2026-10-03
8. avba-daily-r3-19 · nutrient retention dataset
   USDA-RETN-R6:151 FRUITS,FRESH(NOT CITRUS),BAKED, group Fruits and Fruit Juices: folate_total_ug 60% retained, vitamin_c_mg 80%, thiamin_mg 80%, potassium_mg 90%, vitamin_b6_mg 95%, magnesium_mg 100%
   USDA Table of Nutrient Retention Factors, Release 6, 2007, Retn_Code 151 · checked 2026-10-03
9. avba-daily-r3-01 · meta-analysis of RCTs
   Ten unique studies (n = 229) were included. Avocado consumption significantly reduced TC, LDL-C, and TG by -18.80 mg/dL (95% confidence interval [CI], -24.56 to -13.05; I(2), 46.9%), -16.50 mg/dL (95% CI, -22.91 to -10.10; I(2), 72.5%), -27.20 mg/dL (95% CI, -44.41 to -9.99; I(2), 91.1%) respectively.
   J Clin Lipidol, 2016 · checked 2026-10-03
10. avba-daily-r3-02 · meta-analysis
    Of 18 eligible studies (481 subjects), 7 studies compared avocado intake with no intake, 3 studies compared avocado plus monounsaturated fat intake with a control, and 8 studies reported data for qualitative synthesis. In 7 studies, avocado intake significantly increased HDL cholesterol (summary net change: 2.84 mg/dL; 95% CI: 0.18, 5.49 mg/dL), with significant heterogeneity.
    Am J Clin Nutr, 2018 · checked 2026-10-03
11. avba-daily-r3-03 · RCT
    Of 42 randomly assigned participants, 37 completed the avocado condition and 39 completed the control condition. An intention-to-treat analysis showed significantly larger percentage changes, 95% confidence intervals (CIs), from baseline after the avocado condition, compared with after the control condition, for non-HDL cholesterol (-4.65%; 95% CI: -9.01%, -0.08%; P = 0.047), very-low-density lipoprotein cholesterol (-9.30%; 95% CI: -15.3%, -2.82%; P = 0.007); TG (-17.4%; 95% CI: -25.0%, -8.99%; P < 0.001)
    Am J Clin Nutr, 2026 · checked 2026-10-03
12. avba-daily-r3-10 · case report
    After several days of therapeutic INR, the INR became subtherapeutic and remained so for 3 days. The decreased INR correlated temporally with initiation of consistent administration of dried banana flakes to treat diarrhea and the subsequent decrease in the rate and extent of diarrhea. ... A probability score of 5 was obtained upon applying the Drug Interaction Probability Scale modified to address interactions between warfarin and dietary supplements, indicating a probable interaction between warfarin and banana flakes.
    Nutr Clin Pract, 2016 · checked 2026-10-03
13. avba-daily-r3-11 · food challenge study
    Forty-five reactions to 15 other foods were confirmed in 18 patients. 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).
    J Allergy Clin Immunol, 2000 · checked 2026-10-03
14. avba-daily-r3-12 · case series
    All patients showed a positive SPT to banana, and three were IgE-CAP positive (> or = class 2). Two patients were also sensitized (SPT and CAP) to latex, avocado, kiwi, and birch pollen. In the immunoblot these two patients' sera reacted to 32- to 34-kDa proteins, which had already been described as major banana allergens. In both patients banana allergy was confirmed by DBPCFC.
    Ann Allergy Asthma Immunol, 2002 · checked 2026-10-03
15. avba-daily-r3-13 · fact sheet
    Potassium-sparing diuretics, such as amiloride (Midamor) and spironolactone (Aldactone), reduce the excretion of potassium in the urine and can cause hyperkalemia [77,78]. Experts recommend monitoring potassium status in people taking these medications, especially if they have impaired kidney function or other risk factors for hyperkalemia [78].
    NIH Office of Dietary Supplements, Potassium Fact Sheet for Health Professionals · checked 2026-10-03
16. avba-daily-r3-20 · regulatory decision
    POL-HC-6676 Banana Banana is a major dietary source of antioxidants Antioxidants from dietary sources contribute to the protection against free radicals which cause cell damage Contributes to the protection of cells and tissues from oxidative damage Help strengthen our body's natural defences against oxidative stress Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-6676, snapshot 2026-09-21 · checked 2026-10-03
17. avba-daily-r3-21 · regulatory decision
    POL-HC-6664 Avocado-soy extract Natural flexibility for the joints. Accelerates the formation of new cartilage by increasing the formation of cartilage growth factors. Facilitates exercise. Activates the building of joint cartilage. Natural flexibility remains. Accelerates the formation of collagen in joint membrane cells (synoviocytes). Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-6664, snapshot 2026-09-21 · checked 2026-10-03
18. avba-daily-r3-04 · meta-analysis of RCTs
    Studies were conducted in the pediatric population comprising a total of 3996 patients aged 8 to 34 months, eight studies were written in English and one in Spanish. GB-based food consumption significantly increased the hazard of resolution of diarrhea compared to standard treatment (HR 1.96, 95% CI [1.62; 2.37], p < 0.01; I2 = 52%).
    Eur J Pediatr, 2024 · checked 2026-10-03
19. avba-daily-r3-05 · RCT
    The proportion of children who recovered within 72 hours was significantly higher (62.4%) in the green banana group compared to the control group (47.2%) [RR 1.3 (95% CI 1.05-1.7), NNT=7].
    Indian Pediatr, 2020 · checked 2026-10-03
20. avba-daily-r3-14 · prospective cohort
    Of 4647 participants, 2272 met the criteria and were included in the analysis. Compared to avocado non-consumers (during pregnancy), avocado consumers (during pregnancy) had 43.6% lower odds of reporting food allergy among their children at the 12-month follow-up questionnaire while adjusted for relevant covariates.
    Pediatr Res, 2026 · checked 2026-10-03
21. avba-daily-r3-15 · prospective cohort
    In total, 341,519 individuals were followed prospectively. ... Pooled consumption of apple/pear, banana, mushrooms, and onion/garlic was associated with a lower risk of CD (fourth vs first quartile aHR 0.58; 95% CI: 0.33-1.02, P trend 0.03).
    Am J Gastroenterol, 2026 · checked 2026-10-03
22. avba-daily-r3-22 · scoping review
    Future recommendations for novel research include the study of: European, Asian, adolescent or younger, and senior populations; dose-response designs and longer length interventions; dietary compensation; and the need for greater replication.
    Front Nutr, 2025 · checked 2026-10-03