Avocado oil and grapeseed oil: two opposite fats, never compared

These two oils sit at opposite ends of the same scale, and nobody has put them head to head. Avocado oil is mostly monounsaturated fat, grapeseed oil is dominated by linoleic acid, and we found no trial that compares one against the other. The broadest item on this page is a list rather than a number. A systematic review screened 3,581 clinical trials, kept 88, and placed grape seed oil among the foods that moved markers of inflammation. Nothing was pooled, grape seed oil appears there as a name and not with an effect size, and the authors say trials of whole dietary patterns are needed before the finding means anything clinically. Avocado oil does not appear in that list at all, which is a gap in what has been tested rather than a negative result. The US Food and Drug Administration allows a qualified claim that about 20 grams a day of oils high in oleic acid may lower coronary heart disease risk, when those oils replace fats higher in saturated fat. The agency calls that evidence supportive but not conclusive, and a qualified claim is the weakest one it grants. It reaches avocado oil, which is mostly monounsaturated, and not grapeseed oil.

How much is actually in it

• Avocado oil is 71% monounsaturated, 13% polyunsaturated and 16% saturated fat, a split that also helps fat soluble vitamins from the rest of the meal get absorbed. — Hass avocado, the commonest commercial cultivar worldwide Evidence E source
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What a real portion looks like

• The official avocado serving is one fifth of a fruit, or 30 g, while the average American eats half an avocado, about 68 g. — US adults in NHANES dietary recall analysis Evidence E source
  68 g eaten against a 30 g official serving, a gap of more than two to one

What your body absorbs

• The oil a plant compound travels in decides how much of it reaches the body: 5 mg of hydroxytyrosol in grapeseed oil gave 0.33 micrograms per mg creatinine in urine against 0.86 from extra virgin olive oil. — 20 volunteers in a double-blind study, each taking 5 mg of hydroxytyrosol in different food matrices (n = 20) Evidence B source
  Urinary hydroxytyrosol 0.33 against 0.86 micrograms per mg creatinine, grapeseed oil against extra virgin olive oil, no confidence interval reported

What cooking and storage change

• Reheating a cooking oil at 180 degrees Celsius over 10 days pushed its polar compounds from 7.2% to 23.8%, and a meal made with that oil changed post-meal triglycerides in 19 men without measurably harming blood vessel function over 4 hours. — 19 healthy male participants, crossover, one high-fat meal with a repeatedly heated sunflower and palm olein blend against the same blend unheated (n = 19) Evidence B source
  Postprandial triglyceride rise lower after the heated oil, P < 0.001, flow-mediated dilation and arterial stiffness the same between meals
• In 63 children on a 2:1 ketogenic diet built from several cooking oils, grape seed oil among them and none of them tested separately, 52% cut seizures by more than half at 3 months, falling to 30% beyond 3 years. — 63 infants and children with medically intractable epilepsy, 29 boys and 34 girls, median age 2 years 11 months, followed from 2002 to 2018 (n = 63) Evidence C source
  More than 50% seizure reduction in 52%, 43%, 40%, 33% and 30% at 3, 6, 12, 24 months and beyond 3 years, seizure-free 14 to 17%

What it does to your health

• In 44 overweight or obese women on a weight loss diet, taking 15% of energy as grape seed oil for 8 weeks left hs-CRP lower than the same share of energy from sunflower oil. — 44 overweight or obese women randomised to grape seed oil or sunflower oil at 15% of energy, on a weight loss diet for 8 weeks (n = 44) Evidence B source
  Hs-CRP lower with grape seed oil than sunflower oil, P < 0.03, and falls in HOMA-IR and TNF-alpha within the grape seed oil group, no effect sizes reported
• In 20 healthy men, a meal carrying 40 g of grapeseed oil raised post-meal triglycerides less than the same meal carrying 40 g of olive oil. — 20 healthy Chinese men in a crossover study, six isocaloric meals with 40 g of butter, olive oil or grapeseed oil and 50 g of low or high glycaemic index rice (n = 20) Evidence B source
  Lower incremental area under the curve for triglycerides over 4 hours after the grapeseed oil and butter meals than after the olive oil meal, no interval reported
• In a representative survey of 2,736 Australian adults, the 14.7% who ate avocado had lower BMI, smaller waists, lower plasma glucose and higher HDL cholesterol than people who ate none. — 2,736 observations from the Australian Health Survey 2011 to 2013, one 24-hour recall, avocado oil excluded from the intake measure (n = 2736) Evidence C source
  Lower BMI and waist circumference at P below 0.001, lower plasma glucose at P = 0.03, higher HDL at P below 0.001, effect sizes not reported

Safety, limits and interactions

• Grape seed oil cut platelet aggregation by 8.4% in 30 healthy people, and peanut oil cut it by 10.4% in the same study. — 30 healthy subjects taking grape seed or peanut oil, with a control group of 4 taking 500 mg of aspirin daily for 7 days (n = 30) Evidence B source
  8.4 +/- 1% fall in platelet aggregation with grape seed oil and 10.4 +/- 1% with peanut oil, measured by the Born turbidimetric method
• Among 53 adults reporting reactions to melon, avocado was the food most often confirmed alongside it, in 7 patients, level with banana and ahead of kiwi. — 53 consecutive adults with reported melon reactions, skin prick tests and specific IgE to melon, avocado, kiwi, banana, chestnut and latex, then food challenge (n = 53) Evidence C source
  Avocado confirmed in 7 of the 18 patients who reacted to other foods, within a group where 19 of 53 melon reactions were confirmed by challenge

What people believe that the data does not support

• The US Food and Drug Administration allows a qualified claim that about 20 grams a day of oils high in oleic acid may lower coronary heart disease risk when they replace fats higher in saturated fat. The agency calls the evidence supportive but not conclusive. — general US population, oils meeting the agency threshold for oleic acid per serving Evidence E source
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Who this works differently for

• In 2,272 Finnish pregnancies, mothers who ate any avocado had 43.6% lower odds of reporting food allergy in their child at 12 months, with no difference for eczema, wheezing or rhinitis. — 2,272 participants of the Kuopio Birth Cohort, avocado intake by food frequency questionnaire in trimesters 1 and 3, offspring followed to 12 months (n = 2272) Evidence C source
  43.6% lower odds of reported infant food allergy after adjustment, odds rather than risk, no confidence interval in the abstract

What is still unknown

• In a trial of 132 patients, 3,000 mg a day of grape-seed oil for 12 weeks was the comparator arm and produced no adverse events and no change in visual acuity or eye pressure. — 132 patients with dry eye disease and meibomian gland dysfunction at 7 Korean centres, 66 per arm, 12 weeks (n = 132) Evidence B source
  No adverse events related to the supplement and no change in the safety parameters in either arm over 12 weeks
• A systematic review that screened 3,581 trials and kept 88 placed grape seed oil among the foods that moved inflammatory markers, and said trials of whole dietary patterns are still needed before the finding means anything clinically. — 88 clinical trials of functional foods and inflammatory or metabolic mediators in humans (n = 88 trials) Evidence B source
  Grape seed oil listed among foods that regulated inflammation, results not pooled so no summary estimate exists

The bottom line

The composition figures here describe the fruit rather than a bottle. A review of Hass avocado gives the oil inside the fruit as 71 percent monounsaturated, 13 percent polyunsaturated and 16 percent saturated fat, and says that split also helps fat soluble vitamins and plant compounds from the rest of the meal get absorbed. That is a narrative review rather than a measurement of its own, and it describes oil in the fruit, not pressed avocado oil in a bottle. The official avocado serving is one fifth of a fruit, 30 g, while a United States survey analysis puts average intake at half a fruit, 68 g. We have no USDA entry for either oil in this cohort, and no survey layer we hold carries a portion size for avocado oil or grapeseed oil at all. Oils are not interchangeable carriers. In 20 volunteers each given 5 mg of hydroxytyrosol in a different food matrix in a double-blind study, grapeseed oil delivered 0.33 micrograms per mg creatinine in urine against 0.86 from extra virgin olive oil, with no confidence interval reported. Twenty people, one dose, one compound, and avocado oil was not among the oils tested, so this gives no ranking for it. The trial results are about markers, after single meals and short courses. In 44 overweight or obese women on a weight loss diet, 15 percent of energy as grape seed oil for 8 weeks left hs-CRP lower than the same share of energy from sunflower oil, P < 0.03. HOMA-IR and TNF-alpha also fell within the grape seed oil group. Both arms were losing weight, which moves those markers on its own, and the abstract reports directions and P values without effect sizes. In 20 healthy Chinese men, a meal carrying 40 g of grapeseed oil raised triglycerides over the following 4 hours less than the same meal carrying 40 g of olive oil. One meal in 20 young men measured over 4 hours is not a lipid profile and not a cardiovascular outcome. In a cross-sectional survey of 2,736 Australian adults, the 14.7 percent who ate avocado had lower BMI and waist circumference, both at P of 0.001 or below, lower plasma glucose at P = 0.03 and higher HDL cholesterol than people who ate none. That is one day of recall with no effect sizes reported, avocado oil was deliberately left out of the intake measure, and avocado eaters had better overall diet quality, which adjustment cannot remove. If you take an anticoagulant, raise grapeseed oil with the doctor who prescribes it. In 30 healthy people, grape seed oil lowered platelet aggregation by 8.4 percent by the Born turbidimetric method, in a pre-post design whose aspirin control group held four people. That is aggregation measured in a tube, not bleeding in a person. On longer safety, a 12-week trial in 132 patients with dry eye disease used 3,000 mg a day of grape-seed oil as the comparator it assumed to be inert. It reported no adverse events and no change in visual acuity or eye pressure, which 66 people over 12 weeks cannot stretch into a ruling on uncommon harm. Avocado carries a different flag. Among 53 adults reporting reactions to melon, avocado was the food most often confirmed alongside it, in 7 patients, level with banana and ahead of kiwi. That is the fruit, and refined oil carries little protein, so the cross-reaction matters for avocado flesh and for cold-pressed or unrefined oil far more than for refined oil. The group was picked for melon reactions, so those counts give no frequency for anyone else. Two observational findings get repeated more confidently than they were measured. In 2,272 Finnish pregnancies, mothers who ate any avocado had 43.6 percent lower odds of a reported food allergy in their child at 12 months, with no difference for eczema, wheezing or rhinitis. Those are odds and not risk, from self-reported intake and parent-reported allergy, with no confidence interval in the abstract, so it is an association and not a reason to eat avocado for that purpose. In 63 children on a 2:1 ketogenic diet built from several cooking oils including grape seed oil, 52 percent cut seizures by more than half at 3 months and 30 percent still did beyond 3 years, while compliance fell to 27 percent. Nothing in that study separates grape seed oil from the other oils or from the diet itself. On reheating, the one recent trial used neither of these oils. Heating a sunflower and palm olein blend at 180 degrees Celsius over 10 days pushed its polar compounds from 7.2 to 23.8 percent. A high-fat meal made with that oil gave a lower post-meal triglyceride rise in 19 healthy men at P < 0.001, with flow-mediated dilation and arterial stiffness no different from the unheated blend. It was one meal measured over 4 hours, and the authors say it tells you nothing about long-term intake. Buy whichever of the two suits the cooking you actually do, and expect it to do no more than replace the fat it stands in for.

Sources

1. avgo-r3-01 · narrative review
   The avocado oil consists of 71% monounsaturated fatty acids (MUFA), 13% polyunsaturated fatty acids (PUFA), and 16% saturated fatty acids (SFA), which helps to promote healthy blood lipid profiles and enhance the bioavailability of fat soluble vitamins and phytochemicals from the avocado or other fruits and vegetables, naturally low in fat, which are consumed with avocados.
   Crit Rev Food Sci Nutr, 2013 · checked 2026-09-24
2. avgo-r3-02 · narrative review
   Although the official avocado serving is one-fifth of a fruit (30 g), according to NHANES analysis the average consumption is one-half an avocado (68 g)
   Crit Rev Food Sci Nutr, 2013 · checked 2026-09-24
3. avgo-r3-03 · randomised controlled trial
   the intake of extra virgin olive oil, as well as fortified refined olive, flax, and grapeseed oils provided significantly higher urinary contents (0.86, 0.63, 0.55, and 0.33 µg/mg creatinine, respectively) compared with basal urine
   Eur J Nutr, 2021 · checked 2026-09-24
4. avgo-r3-09 · randomised crossover trial
   This randomized, single-blind, crossover study investigated the acute effects of a high-fat meal containing either repeatedly heated (at 180°C, over 10 days, with 5 potato fries per day) sunflower oil-palm olein blend, compared with an unheated blend (containing 23.8% and 7.2% polar compounds respectively), on postprandial lipids and vascular function in 19 healthy male participants...These findings indicate that repeated heating of oil modifies postprandial lipaemia without acutely impairing vascular function.
   Lipids, 2026 · checked 2026-09-24
5. avgo-r3-14 · cohort study
   cooking oils rich in polyunsaturated fatty acid or omega 3 fatty acids, such as olive oil, camellia oil, linseed oil, grape seed oil, and/or perilla oil were used to formulate a classical KD with a 2:1 ratio for infants and children diagnosed with medically intractable epilepsy from April 2002 to April 2018...A greater than 50% seizure reduction was achieved in 52%, 43%, 40%, 33%, and 30% of subjects at each time point.
   Epilepsy Res, 2018 · checked 2026-09-24
6. avgo-r3-04 · randomised controlled trial
   Homeostatic model assessment of insulin resistance (HOMA-IR) scores, hs-CRP and TNF-α decreased in the GSO group. The hs-CRP was lower in GSO than the SFO group (p < 0.03).
   Int J Food Sci Nutr, 2013 · checked 2026-09-24
7. avgo-r3-05 · randomised crossover trial
   A carbohydrate-rich meal (of either low or high GI) that contains butter or grapeseed oil results in lower postprandial TG concentrations relative to olive oil in healthy Chinese males.
   Eur J Nutr, 2018 · checked 2026-09-24
8. avgo-r3-12 · cross-sectional survey
   Consumers of avocados had a lower BMI and waist circumference (each, p ≤ 0.001), lower plasma glucose level (p = 0.03), and higher HDL cholesterol (p ≤ 0.001) when compared with non-consumers.
   Nutr J, 2024 · checked 2026-09-24
9. avgo-r3-06 · randomised controlled trial
   Grape seed oil showed a decrease of 8.4 ± 1% in aggregation, compared with peanut oil, which decreased aggregation by 10.4 ± 1%.
   Am J Ther, 2016 · checked 2026-09-24
10. avgo-r3-08 · food challenge study
    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 2026-09-24
11. avgo-r3-10 · regulatory decision
    daily consumption of about 1½ tablespoons (20 grams) of oils containing high levels of oleic acid
    U.S. Food and Drug Administration, FDA Completes Review of Qualified Health Claim Petition for Oleic Acid and the Risk of Coronary Heart Disease · checked 2026-09-24
12. avgo-r3-07 · prospective cohort
    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 2026-09-24
13. avgo-r3-11 · randomised controlled trial
    those in the grape-seed group received 3000 mg of grape-seed oil daily...There were no changes in safety parameters or adverse events related to taking the dietary supplement in either group.
    JAMA Ophthalmol, 2024 · checked 2026-09-24
14. avgo-r3-13 · systematic review
    Foods identified to regulate inflammation included cranberries, grapes, pomegranate, strawberries, wheat, whole grain products, low fat dairy products, yogurt, green tea, cardamom, turmeric, soy foods, almonds, chia seeds, flaxseed, pistachios, algae oil, flaxseed oil and grape seed oil. Clinical trials that focus on a dietary pattern rich in functional foods are necessary to explore if the additive effect of these foods lead to more clinically relevant outcomes.
    Crit Rev Food Sci Nutr, 2022 · checked 2026-09-24