Avocado and guacamole: two meta-analyses, two answers

Two meta-analyses read the same fruit and came back with different numbers. One pooled 10 randomized trials in 229 adults. Avocado-enriched diets there lowered total cholesterol by 18.80 mg/dL, LDL cholesterol by 16.50 mg/dL (95% CI -22.91 to -10.10) and triglycerides by 27.20 mg/dL, with heterogeneity reaching 91 percent. Those trials fed avocado in place of other fat rather than on top of the usual diet. The other pooled 18 studies in 481 subjects and found only HDL cholesterol moving, by 2.84 mg/dL (95% CI 0.18 to 5.49), with no significant change in total cholesterol, LDL or triglycerides. Both are meta-analyses and both are in the base. The strongest single trial sits closer to the first. In 42 adults with triglycerides of 135 to 499 mg/dL, swapping solid fats and added sugars for about 6.3 oz (180 g) of avocado a day for three weeks cut triglycerides by 17.4 percent (95% CI -25.0 to -8.99) and non-HDL cholesterol by 4.65 percent. That was a double-blind feeding study in which the avocado arrived as muffins, granola and sauces rather than sliced on toast. Guacamole as a dish has almost no research of its own, and we found no study weighing it against the whole fruit.

How much is actually in it

• USDA and UK reference tables disagree on avocado folate by a factor of four, 128.7 micrograms per 3.5 oz (100 g) against 31 micrograms per 3.5 oz (100 g). — USDA Foundation Foods Hass avocado peeled raw, 8 analyzed samples, against CoFID 2021 Avocado Hass flesh only, code 14-386 (n = 8 samples in the USDA set) Evidence E source
  USDA folate 128.7 micrograms per 3.5 oz (100 g) with a sampled range of 102.5 to 146.9, CoFID folate 31 micrograms per 3.5 oz (100 g), a 76% difference
• In the US survey food table raw avocado carries 21 micrograms of vitamin K1 per 3.5 oz (100 g), about 31.5 micrograms in one 150 g fruit and 48.3 micrograms in a cup of mash. — raw avocado, USDA FNDDS 2021-2023, fdc_id 2709223 (n = one FNDDS food, five household measures) Evidence E source
  Vitamin K (phylloquinone) 21 micrograms per 3.5 oz (100 g); 1 fruit 150 g = 31.5 micrograms; 1 cup mashed 230 g = 48.3 micrograms

What a real portion looks like

• In the Multiethnic Cohort one serving of avocado or guacamole was defined as half an avocado or half a cup, and intake was grouped as under one serving a month, one to three a month, or one or more a week. — food frequency questionnaire of the Multiethnic Cohort, 192651 adults in the analysis (n = 192651) Evidence C source
  Serving unit half an avocado or half a cup, highest category one or more servings a week
• In the USDA survey food table one raw avocado weighs 5.3 oz (150 g) and one cup mashed weighs 8.1 oz (230 g). — USDA FNDDS survey food Avocado, raw, food code 63105010, WWEIA category Other vegetables and combinations Evidence E source
  1 fruit 150 g, 1 cup 150 g, 1 cup mashed or pureed 230 g, 1 slice 15 g, quantity not specified 30 g

What your body absorbs

• In two randomized crossover studies in 24 healthy adults, eating fresh avocado with a carotenoid meal raised beta-carotene absorption 2.4-fold from tomato sauce and 6.6-fold from raw carrots. — two sets of 12 healthy men and women, each in a 2-way randomized crossover with one meal served with fresh Hass avocado delivering 23 g of lipid and one without (n = 24) Evidence B source
  Beta-carotene absorption 2.4-fold higher with tomato sauce and 6.6-fold higher with carrots, conversion to vitamin A 4.6-fold and 12.6-fold higher

What cooking and storage change

• By the USDA nutrient retention table for fresh non-citrus fruits, baking is assigned 60% retention for folate and 80% for vitamin C. — USDA Table of Nutrient Retention Factors Release 6, group Fruits and Fruit Juices (code 9), method code 151 fresh non-citrus fruits baked, table dated Sep-75 Evidence E source
  Folate 60%, vitamin C 80%, thiamin 80%, potassium 90%, copper 90%, calcium 95%, iron and magnesium 100%
• Laboratory and skin test data suggest that heating destroys the allergenic activity of Prs a 1, the main avocado allergen of the latex-fruit syndrome. — pool of sera and 8 patients with latex-fruit allergy tested with purified class I chitinases, including the avocado allergen Prs a 1 (n = 8) Evidence D source
  Heat treatment gave a full loss of allergenic capacity of Prs a 1 and the bean chitinase both in vitro and in vivo

What it does to your health

• Observational data link no change in colorectal cancer risk to avocado and guacamole intake in a prospective cohort of 192651 adults. — adults aged 45 to 75 at recruitment in the Multiethnic Cohort in California and Hawaii, followed through SEER cancer registries (n = 192651) Evidence C source
  No significant association overall, by subsite or by race and ethnicity, all p for trend at or above 0.06
• By a meta-analysis of 10 randomized trials in 229 adults, avocado-enriched diets lowered LDL cholesterol by 16.50 mg/dL and triglycerides by 27.20 mg/dL. — adults in 10 randomized clinical trials of avocado-enriched diets, searched to February 2015 (n = 229) Evidence A source
  Total cholesterol -18.80 mg/dL (95% CI -24.56 to -13.05), LDL cholesterol -16.50 mg/dL (95% CI -22.91 to -10.10), triglycerides -27.20 mg/dL (95% CI -44.41 to -9.99)
• In a double-blind controlled feeding crossover trial in adults with elevated triglycerides, replacing solid fats and added sugars with one avocado a day for 3 weeks lowered triglycerides by 17.4% and non-HDL cholesterol by 4.65%. — adults with elevated triglycerides of 135 to 499 mg/dL, two 3-week periods separated by a 2-week washout, about 6.3 oz (180 g) of avocado and 300 calories a day (n = 42) Evidence B source
  Non-HDL cholesterol -4.65% (95% CI -9.01 to -0.08), VLDL cholesterol -9.30% (95% CI -15.3 to -2.82), triglycerides -17.4% (95% CI -25.0 to -8.99), small LDL subfraction -13.9% (95% CI -23.2 to -3.49)

Safety, limits and interactions

• By FDA sampling, 15 of 887 processed avocado and guacamole samples tested positive for Listeria monocytogenes and two for Salmonella. — 887 processed avocado or guacamole samples collected by FDA, 777 domestic and 110 import, results as of October 15 2019 (n = 887 samples) Evidence E source
  15 samples positive for Listeria monocytogenes (13 domestic, 2 import) and 2 positive for Salmonella, both domestic
• The FDA-approved warfarin label says the amount of vitamin K in food may affect therapy and asks patients to keep a consistent amount of vitamin K in a normal, balanced diet. — patients taking warfarin sodium, manufacturer label effective 2026-06-25 Evidence E source
  Competitive antagonism of vitamin K named as an interaction mechanism; a normal balanced diet with a consistent amount of vitamin K advised

What people believe that the data does not support

• The EU register records the claim that avocado-soy extract gives natural flexibility for the joints and accelerates cartilage formation as non-authorized, and no claim about avocado is authorized. — EU Register on nutrition and health claims, snapshot 2026-09-21, one claim filed under avocado and none authorized Evidence E source
  Status Non-authorized

Who this works differently for

• In a randomized trial in 241 adults with central obesity, one avocado a day for 6 months changed no cognitive domain against a no-avocado control. — adults aged 25 to 84 with elevated waist circumference, mean age 49.6 years, mean BMI 33.4, ancillary study of the Habitual Diet and Avocado Trial at the Loma Linda site (n = 241) Evidence B source
  No significant group by time interaction in memory, processing speed, executive function, simple reaction time or working memory reaction time
• Observational data link avocado intake during pregnancy with 43.6% lower odds of parent-reported food allergy in the child at 12 months. — 2272 pregnancies in the Kuopio Birth Cohort with avocado intake assessed in trimesters 1 and 3 and allergic outcomes at 12 months (n = 2272) Evidence C source
  43.6% lower adjusted odds of reported food allergy at 12 months, no association with rhinitis, wheezing or atopic eczema
• In a retrospective cohort of 146 Asian American children with food protein-induced enterocolitis syndrome, avocado was the culprit food in 9.6% of cases. — 146 Asian American children under 18 with acute FPIES diagnosed between October 2015 and December 2022 in a Northern California health system, median age at diagnosis 7 months (n = 146) Evidence C source
  Avocado named in 9.6% of cases, behind egg 36.3%, oats 24% and milk 16.4%
• FDA counts pregnant women and their unborn or newborn babies, adults over 65 and people with weakened immune systems as the high-risk groups for listeriosis, and says that in pregnancy the infection can lead to miscarriage and stillbirth. — pregnant women and their unborn or newborn baby, adults over the age of 65, people with weakened immune systems Evidence E source
  Named as high-risk groups for serious effects of listeriosis; in pregnancy the infection can lead to miscarriage and stillbirth
• In a clinical series of 25 latex-allergic patients, 13 also had food allergies, and avocado was the most frequent culprit, named in 9 patients, with cross-reactivity between latex and avocado shown in the lab. — 25 patients diagnosed with latex allergy, mean age 33, 23 women, including greenhouse and hospital workers (n = 25) Evidence C source
  42 food allergies in 13 of 25 patients (52%), 23 of them systemic anaphylaxis; avocado the most frequent (9), with chestnut (9), banana (7), kiwi (5)
• Among 136 patients with latex allergy, 42.5% reported allergic symptoms after eating fruits such as avocado, banana and kiwi, and blood tests picked up only about a third of those who reacted. — 136 patients with documented immediate-type latex hypersensitivity (n = 136) Evidence C source
  Fruit-specific IgE in 69.1%; 42.5% reported allergic symptoms after eating cross-reacting fruits including avocado; IgE found in only 32.1% of those with symptoms

What is still unknown

• By a meta-analysis of 18 studies in 481 subjects, avocado intake raised HDL cholesterol by 2.84 mg/dL and changed no other blood lipid, and no study reported heart attacks or strokes. — subjects in 18 eligible studies of avocado intake searched from 1946 through September 2017, 7 of them pooled for HDL cholesterol (n = 481) Evidence A source
  HDL cholesterol summary net change 2.84 mg/dL (95% CI 0.18 to 5.49), no significant difference in total cholesterol, LDL cholesterol or triglycerides

The bottom line

Three different amounts are in play here and they are not interchangeable. The USDA survey table puts one raw avocado at 150 g and one cup mashed at 230 g. The cohort work counted a serving as half an avocado or half a cup, and 62.8 percent of its 192651 participants ate less than one such serving a month. The feeding trials use about 180 g every day. That cohort, following 192651 adults aged 45 to 75 through cancer registries, found no association between avocado and guacamole intake and colorectal cancer, with every trend p value at or above 0.06. Its single questionnaire item could not tell the fruit and the dip apart. On the guacamole side the measured difference is hygiene. FDA sampling of 887 processed avocado and guacamole samples found 15 positive for Listeria monocytogenes and 2 for Salmonella. That is a share of samples tested rather than a chance of anyone getting sick, and no comparable sampling covers the whole unopened fruit. It matters most for the groups FDA counts as high risk for listeriosis: pregnant women and their unborn or newborn babies, adults over 65 and people with weakened immune systems. In pregnancy the infection can lead to miscarriage and stillbirth. Avocado is also a known food allergen, above all for people allergic to latex. In a clinical series of 25 latex-allergic patients, 13 also had food allergies and avocado was the most frequent culprit, named in 9, and 23 of the 42 food reactions in that group were systemic anaphylaxis. Among 136 latex-allergic patients, 42.5 percent reported symptoms after fruits such as avocado, banana and kiwi, and blood tests found fruit-specific IgE in only about a third of those who reacted, so a negative blood test does not settle it. Both groups were already allergic to latex, so this says nothing about how common avocado allergy is in everyone else. Laboratory and skin-test work suggests heat destroys Prs a 1, the main avocado allergen in this syndrome, but avocado and guacamole are normally eaten raw. In children, among 146 Asian American children with food protein-induced enterocolitis syndrome, a rare condition, avocado was the culprit food in 9.6 percent of cases, behind egg, oats and milk. On warfarin, one 150 g avocado carries about 31.5 micrograms of vitamin K1 by the US survey table, about a third of what a 25 g cup of raw kale carries. The FDA-approved warfarin label does not name avocado. It says the amount of vitamin K in food may affect therapy and asks patients to keep a consistent amount in a normal, balanced diet. A 1991 letter reporting avocado and warfarin together exists, but we could not read its content, so it carries no card here. Fat is what moves the carotenoids. In two randomized crossover studies in 24 healthy adults, fresh avocado supplying 23 g of lipid raised beta-carotene absorption 2.4-fold from tomato sauce and 6.6-fold from raw carrots, each against the same meal served without it. No other fat was tested against avocado, so whether the avocado or the lipid did the work is open. The cognition question has a flat answer. In 241 adults with central obesity, one avocado a day for six months moved no cognitive domain against a no-avocado control. A cohort of 2272 pregnancies linked any avocado intake with 43.6 percent lower odds of parent-reported food allergy in the child at 12 months, with no dose recorded and the allergies reported by parents rather than tested. For a pregnant reader the listeria caution above applies to ready-made guacamole and processed avocado. The only health claim in the EU register under avocado, in the 2026-09-21 snapshot, is for an avocado and soy extract sold for joints, and it was refused, so nothing about the fruit is authorized to be said on a label. Two loose ends are worth knowing. USDA measures 128.7 micrograms of folate per 3.5 oz (100 g) in Hass avocado across 8 samples while the UK table records 31, and the spread inside the USDA samples is only 34 percent, too small to cover a gap that size. Which table is closer to the fruit in your hand, and why they differ, neither dataset says. And no study in either meta-analysis reported a heart attack or a stroke, which is the ceiling on what the lipid numbers above can tell you.

Sources

1. avoguac-daily-r5-12 · reference dataset
   Avocado, Hass, peeled, raw | Folate, total | 128.7 UG | range 102.5-146.9, median 132.9, 8 samples, spread 34% || CoFID 2021 code 14-386 Avocado, Hass, flesh only | Folate | 31 ug per 100 g
   USDA FoodData Central Foundation Foods release 2026-04-30 and CoFID 2021 Public Health England code 14-386 · checked 2026-09-25
2. hf2-avog-3 · reference dataset
   Avocado, raw · Vitamin K (phylloquinone) 21 UG per 100 g [fdc_id 2709223] · 1 slice 15 g 3.1 UG · 1 fruit 150 g 31.5 UG · 1 cup, mashed or pureed 230 g 48.3 UG
   USDA FNDDS 2021-2023, Avocado, raw, fdc_id 2709223 · checked 2026-10-08
3. avoguac-daily-r5-02 · prospective cohort study
   Participants were categorized into three avocados/guacamole consumer groups: <1 serving/month, 1–3 serving/month, and ≥1 serving/week with one serving defined as ½ avocado or ½ cup, consistent with the avocados consumer groups in Ericsson et al.’s study for comparison (9).
   Nutr Cancer, 2024 · checked 2026-09-25
4. avoguac-daily-r5-14 · reference dataset
   Avocado, raw | FNDDS code 63105010 | fdc_id 2709223 | 1 fruit 60813 = 150 g | 1 cup 10205 = 150 g | 1 cup, mashed or pureed 10119 = 230 g | 1 slice 61935 = 15 g
   USDA FNDDS, Avocado raw, food code 63105010, fdc_id 2709223 · checked 2026-09-25
5. avoguac-daily-r5-10 · randomized crossover trials
   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). Most notably, consumption of avocado enhanced the efficiency of conversion to vitamin A (as measured by retinyl esters) by 4.6-fold in study 1 (P < 0.0001) and 12.6-fold in study 2 (P = 0.0013).
   J Nutr, 2014 · checked 2026-09-25
6. avoguac-daily-r5-13 · reference dataset
   FRUITS,FRESH(NOT CITRUS),BAKED | Fruits and Fruit Juices (9) | Retn_Code 151 | folate_total_ug 60% | vitamin_c_mg 80% | thiamin_mg 80% | potassium_mg 90%
   USDA Table of Nutrient Retention Factors, Release 6, 2007, code USDA-RETN-R6:151 · checked 2026-09-25
7. hf2-avog-6 · allergen characterization study
   Heat treatment of both Prs a 1 and PvChI produced a full loss of their allergenic capacities both in vitro and in vivo.
   J Allergy Clin Immunol, 2000 · checked 2026-10-08
8. avoguac-daily-r5-01 · prospective cohort study
   Of 192,651 eligible participants, 62.8% reported consuming <1 serving/month avocados/guacamole, 26.7% reported 1-3 servings/month, and 10.5% reported ≥1 serving/week. When adjusted for relevant covariates, there was no significant association with incident colorectal cancer overall, for subsites, or within racial and ethnic subgroups (all p for trend ≥ 0.06).
   Nutr Cancer, 2024 · checked 2026-09-25
9. avoguac-daily-r5-03 · meta-analysis of randomized clinical trials
   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 2026-09-25
10. avoguac-daily-r5-05 · randomized controlled crossover trial
    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), small low-density lipoprotein subfraction cholesterol (-13.9%; 95% CI: -23.2%, -3.49%; P = 0.012), and total cholesterol:HDL cholesterol ratio (-6.56%; 95% CI: -12.0%, -0.79%; P = 0.028).
    Am J Clin Nutr, 2026 · checked 2026-09-25
11. avoguac-daily-r5-08 · agency sampling program
    As of October 15, 2019, the FDA has tested 887 processed avocado or guacamole samples (777 domestic, 110 import). ... Of the processed avocado or guacamole samples, 15 tested positive for Listeria monocytogenes (13 domestic, 2 import), and two tested positive for Salmonella (both domestic samples).
    US Food and Drug Administration, FDA Sampling Fresh Herbs, Guacamole and Processed Avocado · checked 2026-09-25
12. hf2-avog-2 · FDA drug label section
    The amount of vitamin K in food may affect therapy with warfarin sodium. Advise patients taking warfarin sodium to eat a normal, balanced diet maintaining a consistent amount of vitamin K.
    Warfarin Sodium, FDA-approved label, drug interactions section, effective 2026-06-25 · checked 2026-10-08
13. avoguac-daily-r5-11 · regulatory register entry
    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 2026-09-25
14. avoguac-daily-r5-06 · randomized controlled trial
    Working memory reaction time improved for all participants at the end of the 6-month intervention, but no significant group by time interactions were found between the AVO and CON groups in any of the cognitive domains.
    J Nutr Health Aging, 2026 · checked 2026-09-25
15. avoguac-daily-r5-07 · prospective cohort study
    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 2026-09-25
16. avoguac-daily-r5-09 · retrospective cohort study
    The most common culprit foods included egg (36.3%), oats (24%), milk (16.4%), avocado (9.6%), rice (6.8%), and peanut (5.5%).
    Ann Allergy Asthma Immunol, 2026 · checked 2026-09-25
17. hf2-avog-1 · agency advice
    Pregnant women and their unborn or newborn baby, adults over the age of 65, and those with weakened immune systems, are all considered to be high-risk groups that are susceptible to the serious and adverse effects of listeriosis. ... While listeriosis can present as a mild disease in pregnant woman, the infection can lead to serious complications with their pregnancy, including miscarriage and stillbirth.
    Listeria (Listeriosis), US Food and Drug Administration, At-Risk Groups · checked 2026-10-08
18. hf2-avog-4 · prospective clinical series
    Forty-two food allergies were diagnosed in 13 of our patients (52%), and 23 of these consisted of systemic anaphylaxis. The most frequent food hypersensitivities were to avocado (9), chestnut (9), banana (7), kiwi (5) and papaya (3). Through RAST-inhibition, cross-reactivity among latex, avocado, chestnut, and banana was demonstrated.
    Ann Allergy, 1994 · checked 2026-10-08
19. hf2-avog-5 · cross-sectional serology study
    Fruit-specific IgE antibodies were detected in 69.1% of serum samples. ... Of our patients, 42.5% reported allergic symptoms after ingestion of these fruits and a total of 112 intolerance reactions were recorded. However, fruit-specific IgE antibodies were detected only in serum samples from 32.1% of the patients who perceived symptoms due to these fruits.
    Allergy, 1997 · checked 2026-10-08
20. avoguac-daily-r5-04 · systematic review and meta-analysis
    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. ... No studies reported incident clinical outcomes of CVD, including myocardial infarction, stroke, and other clinical endpoints.
    Am J Clin Nutr, 2018 · checked 2026-09-25