Are seed oils worse than butter or ghee?

Cooking-oil claims often mix food chemistry, short trials and long-term disease. Separate what ordinary oil comparisons show from what they cannot establish about your kitchen.

Prepared by PoshanSense · AI-assisted educational writing
Our sources and editorial approach · Not clinically reviewed

Complementary human studies · Published 2018 & 2022

One video calls seed oils toxic; the next says ghee is the solution. Both make an everyday cooking choice sound like a decisive health test. The trouble is that “oil” is a broad category and “healthier” can mean several different outcomes.

Start with what is being compared

Replacing one cooking fat with another is a different question from replacing a balanced meal with fried snacks. It also differs from adding extra fat without changing anything else. A useful comparison tells us the foods, amounts, duration and measured outcome instead of relying on the words natural or refined.

The 2018 UK experiment helps illustrate that. After four weeks, the butter group had a greater rise in LDL than the olive-oil group: the between-group difference was about 0.38 mmol/L, with a 95% confidence interval of 0.16–0.60. Butter also differed from coconut oil in this setting.

That is evidence about the fats and participants tested. It is not a direct seed-oil-versus-ghee result, and it does not turn the experimental 50 g/day instruction into advice to consume that amount.

What about seed oils themselves?

A 2022 UK trial randomised 84 adults with overweight or obesity (61 completed all 12 weeks) to rapeseed oil, sunflower oil or a control routine for 12 weeks. It did not find a clear between-group effect on its main urinary proteomic measures intended to reflect coronary or kidney disease risk.

Those were biomarker scores, not observed heart attacks or kidney disease. Some secondary measurements differed, but an isolated secondary result does not establish that every seed oil is toxic—or that the tested oils are interchangeable in every respect.

The two experiments are complementary because they challenge shortcuts in interpretation. One measured changes in a familiar blood lipid; the other tested different oils with specialised markers. We cannot combine their numbers into a single league table.

Does natural automatically mean better?

No research design is improved by that label. Butter, ghee, coconut oil, olive oil and sunflower oil have different compositions and culinary uses. The WHO’s dietary guidance distinguishes fat quality and generally favours unsaturated fats over saturated fats within the overall diet. It does not endorse an unlimited quantity of any one oil.

Ghee deserves the same scrutiny as the alternative. Neither linked trial tested it directly, so we will not pretend to know its exact effect from a butter result. A familiar ingredient can be enjoyable without needing a disease-prevention promise attached to it.

Your pan is not the whole study

Kitchen questions also depend on the food, the amount used and how it is cooked. These trials were not experiments in repeatedly reheated commercial frying oil. Evidence about a dietary oil should not silently become a verdict about every processing or cooking condition.

For a food journal, describe the actual dish and estimated cooking fat rather than declaring all oils either good or bad. A spoon used across several portions is not the same as that quantity eaten by one person. Portions matter for interpreting a recipe even when its precise composition is uncertain.

A calmer way to read the next claim

Ask what was replaced, what was measured and how long people were followed. A cell experiment, a change in LDL and a long-term disease outcome are different kinds of evidence. None should be relabelled to make a more dramatic headline.

These comparisons do not settle every oil question. They do give a reason to avoid broad alarm about an entire category and broad reassurance about its fashionable replacement. If you need a diet adapted to a diagnosed condition, a general cooking-oil explainer cannot make that choice for you.

Evidence context: the 2018 trial reports BBC and public research support, with no competing interests. The 2022 trial reports BBC support, donated rapeseed oil and author relationships involving an oil company and the biomarker-assay company. Its limitations remain relevant whichever product you prefer.

Published 11 October 2026 · Sources checked 11 October 2026. Suggest a correction.