In the next few minutes: what's actually in rapeseed and sunflower oil, how they stack up against butter and coconut oil, what the strongest evidence really shows, and why the food around the oil often matters more than the oil itself.
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Open your kitchen cupboard. Somewhere in there is a bottle of sunflower or rapeseed oil. To some corners of the internet, that bottle is public enemy number one, blamed for inflammation, weight gain, even chronic disease. To most dietitians, it's just oil. Today we separate the shouting from the evidence, one bottle at a time.
Rapeseed oil is grown across British fields, and it's one of the lowest in saturated fat of any cooking oil, around 7 grams per 100 millilitres. It carries useful omega-3, and a high smoke point, so it copes well with roasting. The toxic seed oil claims rarely mention it's the fat UK dietitians often recommend swapping into.
Butter, for comparison, is around 51 grams of saturated fat per 100 grams, roughly half the tub. Saturated fat raises LDL cholesterol, the kind linked to heart disease, more reliably than any seed oil ever has. Swapping butter for rapeseed or olive oil in cooking is one of the best-evidenced small changes there is.
Coconut oil markets itself as the wholesome choice, yet it's around 82 to 92 grams saturated fat per 100, more than butter. It's a strange twist: the oil influencers often praise is higher in the fat that raises cholesterol than the ones they warn you off. Evidence hasn't changed, the marketing has.
Extra virgin olive oil is the rare oil nobody really argues about. Decades of Mediterranean diet trials, including large randomised studies, link it to fewer heart attacks and strokes. It's mostly monounsaturated fat, with polyphenols from the olive itself. Cost aside, it's the closest thing nutrition science has to consensus.
Margarine had a genuinely bad chapter, decades ago, when it was loaded with trans fats. UK reformulation changed that; today's spreads are typically under 1 gram of trans fat per 100, often less. The seed oils inside are the same rapeseed and sunflower we've already met, the fear is stuck in the past.
A packet of crisps is fried in sunflower or rapeseed oil, and it's easy to blame the oil for what's really a highly processed, salty, easy-to-overeat food. Large cohort studies link ultra-processed foods generally to weight gain, not the specific fat molecule inside them. The oil is a minor character, the whole product is the story.
Is the sunflower oil in my stir-fry actually bad for me?
Not on its own — it's low in saturated fat. Watch the whole dish: how much oil, what else is fried, and how often. That's what moves the needle. (answer generated by SugarCoach, the AI coach)
General lifestyle education, not medical advice — personal medical decisions belong with your GP or pharmacist.