Avocado and olive oil: good company for vegetables, quiet on blood sugar

In trials, olive oil did not move fasting blood sugar. A meta-analysis of 51 randomized trials in 4334 adults found no significant change in fasting glucose (-0.04 mg/dL, 95% CI -0.1 to 0.02). Only in a dose analysis did 25 to 50 g a day improve HOMA-IR, a score of insulin resistance, and heterogeneity across those trials was high. A second meta-analysis of trials found olive oil does not seem to change where the body stores fat. In small single-meal trials, both foods went with better absorption of the color pigments in vegetables, avocado against no added fat and olive oil against coconut oil. In two crossover trials of 12 healthy adults each, adding Hass avocado with 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. In 16 adults, a carotenoid-rich salad with 0.99 oz (28 g) of olive oil gave 55.2 percent more total carotenoid absorption than the same salad with coconut oil, again after one meal. We found no trial that compared avocado with olive oil directly.

How much is actually in it

• Raw Hass avocado flesh holds about 20 g of fat and about 576 mg of potassium per 3.5 oz (100 g), with fat varying from 18.8 to 21.8 g across 8 USDA samples. — Avocado, Hass, peeled, raw; 8 analyzed samples (n = 8) Evidence E source
  Fat 20.31 g/100 g (range 18.76-21.83); potassium 576.4 mg/100 g (range 528-623)
• Per 100 g, olive oil gives 899 calories and 73 g of monounsaturated fat, while Hass avocado flesh gives 171 calories, 10 g of monounsaturated fat and 3.1 g of fiber. — CoFID codes 17-038 (Oil, olive) and 14-386 (Avocado, Hass, flesh only) (n = -) Evidence E source
  Olive oil: fat 99.9 g, MUFA 73.0 g, SFA 14.3 g, PUFA 8.2 g; avocado: fat 17.4 g, MUFA 9.98 g, SFA 4.15 g, AOAC fiber 3.1 g

What a real portion looks like

• In the US survey database one whole avocado is counted as 150 g and one tablespoon of olive oil as 14 g. — FNDDS foods 63105010 (Avocado, raw) and 82104000 (Olive oil) (n = -) Evidence E source
  Avocado: 1 fruit 150 g, 1 slice 15 g, unspecified 30 g; olive oil: 1 tablespoon 14 g

What your body absorbs

• In two small crossover RCTs, adding Hass avocado (23 g fat) to a carrot meal raised beta-carotene absorption 6.6-fold and to a tomato sauce meal 2.4-fold. — Healthy men and women, two sets of 12, single test meals (n = 24) Evidence B source
  Beta-carotene absorption x2.4 (tomato sauce) and x6.6 (carrots); alpha-carotene x4.8; P<0.0001
• In a crossover RCT of 16 adults, a salad eaten with 0.99 oz (28 g) of olive oil gave 55.2% more total carotenoid absorption than the same salad with coconut oil. — 16 subjects, carotenoid-rich salad with 28 g of test fat, 10 h sampling (n = 16) Evidence B source
  Total carotenoid iAUC +55.2% (olive vs coconut oil); emulsified fat +40.0%

What cooking and storage change

• A systematic review of 23 publications found no support for the idea that frying in general raises cardiovascular risk, and one large trial advised virgin olive oil also for frying. — 23 publications on vegetable oil and fried food intake (n = 23 publications) Evidence C source
  No general CVD risk from frying; fried food intake probably linked to weight gain

What it does to your health

• A meta-analysis of 51 RCTs in 4334 adults found olive oil did not change fasting glucose (WMD -0.04 mg/dL) or HbA1c, though 25-50 g a day improved HOMA-IR. — Adults in 51 randomized trials (n = 4334) Evidence A source
  Glucose WMD -0.04 mg/dL (95% CI -0.1 to 0.02); HbA1c WMD 0.02% (-0.01 to 0.06); HOMA-IR WMD -0.09 (-0.25 to 0.06)
• A meta-analysis of RCTs in adults found olive oil does not seem to change body fat distribution, with only a small indication that olive oil capsules may raise adipose mass and waist circumference. — Adults in randomized trials comparing olive oil with other oils, 52 articles (n = 52 articles) Evidence A source
  Adipose mass MD 0.62 lb (95% CI -0.6 to 1.8; metric: 0.28 kg, -0.27 to 0.83) with capsules; waist MD 1.74 (0.86 to 1.62 as printed)

Safety, limits and interactions

• Observational data link any avocado intake during pregnancy with 43.6% lower odds of food allergy in the child at 12 months, among 2272 Finnish mother-child pairs. — Kuopio Birth Cohort, 2272 pregnancies, FFQ in trimesters 1 and 3 (n = 2272) Evidence C source
  43.6% lower odds of infant food allergy (adjusted); no association for rhinitis, wheezing, eczema
• Among 18 melon-allergic patients with other confirmed food reactions, avocado was one of the most common co-allergies, seen in 7. — 53 adults reporting melon reactions; 18 with confirmed reactions to other foods (n = 53) Evidence C source
  Avocado co-allergy in 7 patients

What people believe that the data does not support

• The EU did not authorize the claim that olive oil promotes heart health. — EU register entry for olive oil (n = -) Evidence E source
  Status Non-authorized
• The EU did not authorize joint and cartilage claims for avocado-soy extract. — EU register entry for avocado-soy extract (n = -) Evidence E source
  Status Non-authorized

Who this works differently for

• In an RCT of 200 patients after ischemic stroke, an avocado-based Mediterranean diet did not lower LDL-C versus a low-fat diet at 90 days (difference -3.4 mg/dL). — Adults with ischemic stroke in the previous month, 3 months of diet (n = 200) Evidence B source
  LDL-C 66.5 vs 69.9 mg/dL; adjusted difference -3.4 mg/dL, P = 0.50
• A meta-analysis of 4 cohorts and 6 RCTs linked the highest olive oil intake with 13% lower diabetes risk in cohorts, and with 23% lower risk in people over 50. — Adults in 10 studies, more than 500,000 subjects (n = >500000) Evidence C source
  Cohorts RR 0.87 (0.83-0.92); RCTs RR 0.78 (0.70-0.88); age >50 RR 0.77 (0.70-0.89)

What is still unknown

• A scoping review of 45 avocado studies found trials used 60-300 g a day while people usually eat 0-10 g, and Europe, Asia, teens and seniors are barely studied. — 45 unique studies (28 interventions, 17 observational) (n = 45 studies) Evidence C source
  Intervention doses 60-300 g/d vs observed 0-10 g/d

The bottom line

Per 100 g, UK tables give olive oil 899 calories and 73 g of monounsaturated fat, and Hass avocado flesh 171 calories, 10 g of monounsaturated fat and 3.1 g of fiber. A portion changes the picture. The US survey counts a whole avocado as 150 g and a tablespoon of olive oil as 14 g. Across 8 USDA samples, raw Hass avocado held 18.8 to 21.8 g of fat per 3.5 oz (100 g) and about 576 mg of potassium. The diabetes risk numbers are observational. A meta-analysis mixing 4 cohorts and 6 trials, more than 500,000 people, linked the highest olive oil intake with 13 percent lower diabetes risk in the cohorts (RR 0.87, 95% CI 0.83 to 0.92). The link was 23 percent in people over 50. Set that beside the 51 trials above, where fasting glucose did not move. After an ischemic stroke, 200 adults on an avocado-based Mediterranean diet for 90 days ended with LDL cholesterol of 66.5 mg/dL against 69.9 on a low-fat diet, a difference that was not significant in this pilot trial. A systematic review of 23 mostly observational publications found no support for the idea that frying in general raises cardiovascular risk. It points to one large trial whose diet advice included virgin olive oil for frying. Who should be careful. Among 18 people with melon allergy and other confirmed food reactions, 7 also reacted to avocado, a descriptive count in allergy patients. In a Finnish cohort of 2272 mother and child pairs, any avocado in pregnancy went with 43.6 percent lower odds of food allergy reported for the child at 12 months. That allergy was self-reported and other habits may explain it, so it does not show that avocado prevents allergy. We have no card on drug interactions for either food. The EU refused the claim that olive oil promotes heart health. It also refused joint claims for avocado-soy extract, which is a different product from the fruit. Avocado trials fed 2.1 to 11 oz (60 to 300 g) a day, while people usually eat 0 to 10 g, so trial doses sit far above a normal plate.

Sources

1. avol-daily-r7-01 · Food composition dataset
   Avocado, Hass, peeled, raw | Total lipid (fat) 20.31 g (range 18.76-21.83, 8 samples) | Potassium, K 576.4 mg (range 528.0-623.0, 8 samples)
   USDA FoodData Central, Foundation Foods, release 2026-04-30 · checked 2026-10-02
2. avol-daily-r7-02 · Food composition dataset
   Oil, olive | CoFID 17-038 | per 100 g: energy 899 kcal, fat 99.9 g, mono FA 73.00 g, satd FA 14.30 g, poly FA 8.20 g | Avocado, Hass, flesh only | CoFID 14-386 | per 100 g: energy 171 kcal, fat 17.4 g, mono FA 9.98 g, satd FA 4.15 g, AOAC fibre 3.1 g
   CoFID 2021, Public Health England (OGL v3.0) · checked 2026-10-02
3. avol-daily-r7-03 · Food composition dataset
   Avocado, raw | FNDDS 63105010 | 1 fruit: 150 g | 1 slice: 15 g | Quantity not specified: 30 g | Olive oil | FNDDS 82104000 | 1 tablespoon: 14 g
   USDA FNDDS 2021-2023 (FoodData Central survey foods) · checked 2026-10-02
4. avol-daily-r7-04 · Randomized crossover trial
   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 2026-10-02
5. avol-daily-r7-05 · Randomized crossover trial
   Sixteen subjects consumed salad with 4 test fats in random order, and plasma triglyceride and carotenoid (lutein, zeaxanthin, α-carotene, β-carotene, and lycopene) concentrations were determined hourly for 10 h following the consumption. ... Similarly, the positive iAUC1-10h of TC, α-carotene, and lycopene were 55.2%, 110.8%, and 45.8%, respectively, higher with olive oil than with coconut oil.
   Am J Clin Nutr, 2023 · checked 2026-10-02
6. avol-daily-r7-06 · Systematic review
   A total of twenty-three publications were included based on specific selection criteria. Based on the results of the studies included in the present systematic review, we conclude that (1) the myth that frying foods is generally associated with a higher risk of CVD is not supported by the available evidence; (2) virgin olive oil significantly reduces the risk of CVD clinical events, based on the results of a large randomised trial that included as part of the intervention the recommendation to use high amounts of virgin olive oil, also for frying foods
   Br J Nutr, 2015 · checked 2026-10-02
7. avol-daily-r7-07 · Meta-analysis of RCTs
   51 trials (n = 4334 participants) were included in the meta-analysis. We found the consumption of olive oil was not associated with statistically significant changes in blood glucose (WMD = -0.04 mg dL-1; 95% CI, -0.1 to 0.02; P = .18; I2 = 27.05%) ... However, a daily dose of 25-50 g significantly improves the HOMA-IR parameter, suggesting a potential benefit for diabetes management.
   Nutr Rev, 2026 · checked 2026-10-02
8. avol-daily-r7-08 · Meta-analysis of RCTs
   The results indicate that the consumption of olive oil does not seem to alter the distribution of body fat, despite a small indication that supplementation in capsules can increase adipose mass (Mean Difference = 0.28 kg, 95% CI [-0.27, 0.83]; between-groups difference p = 0.59) and waist circumference (mean difference = 1.74 kg, 95% CI [0.86, 1.62]; between-groups difference p < 0.01)
   Food Funct, 2023 · checked 2026-10-02
9. avol-daily-r7-10 · 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 2026-10-02
10. avol-daily-r7-12 · 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 2026-10-02
11. avol-daily-r7-13 · EU claims register
    POL-HC-7679 Olive Oil Olive Oil promotes your heart health Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-7679, snapshot 2026-09-21 · checked 2026-10-02
12. avol-daily-r7-14 · EU claims register
    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 2026-10-02
13. avol-daily-r7-09 · Randomized controlled trial
    From August 2018 to October 2022, 200 participants were enrolled (97 randomized to the low-fat diet and 103 to the MeDi), with 189 (94.5%) completing the study. There were no significant differences in LDL-C levels between the MeDi group and the low-fat group at 90 days: 66.5 mg/dL (95% confidence interval [CI] 59.6, 73.4) in the MeDi group and 69.9 mg/dL (62.6, 77.2) in the low-fat group at the end of follow-up.
    Lipids Health Dis, 2025 · checked 2026-10-02
14. avol-daily-r7-11 · Meta-analysis (mixed designs)
    A 13% (RR = 0.87, 95%CI = 0.83 - 0.92, P < 0.01) decreased risk of diabetes was shown in Cohort study and 22% (RR = 0.78, 95%CI = 0.70 - 0.88, P < 0.01) decreased risk in RCT study for the highest vs. lowest olive oil consumption. Subgroup analysis results showed that there was a better effect on reducing diabetes risk in age > 50 years(RR = 0.77, 95%CI = 0.70 - 0.89, P < 0.01)
    J Health Popul Nutr, 2025 · checked 2026-10-02
15. avol-daily-r7-15 · Scoping review
    Larger amounts of avocados were used in interventions than commonly consumed in observational studies (60-300 vs. 0-10 g/d, respectively). ... 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 2026-10-02