Which Cooking Oil Is Best for Weight Loss? Mustard, Refined, Olive & Ghee (India)

By NYUS Inc. · Updated July 2026

Every few months a new oil is crowned the "weight-loss oil" — cold-pressed mustard, extra-virgin olive, rice bran, "filtered" groundnut, even coconut. The bottles get fancier and the claims get bolder. Here's the part the labels leave out: as far as your waistline is concerned, they're almost the same. Every cooking oil is close to pure fat, which means every oil is roughly the same number of calories per spoon. The oil you choose changes the quality of the fat and how it behaves in the pan — not whether you lose weight. That's decided by how much you use. Let's put real numbers on it.

The one-line answer

No cooking oil burns fat, and none is meaningfully "lighter" than another — mustard, refined, groundnut, rice-bran, olive oil and ghee are all about 120 kcal per tablespoon because they're nearly 100% fat. For weight loss, the amount you use matters far more than the type. Pick an oil that suits your cooking and your heart, use a variety, keep it to a measured few teaspoons a day, and let your calorie deficit do the actual work.

The numbers: every oil is basically the same calories

Fat is the most calorie-dense thing on your shelf — about 9 kcal per gram, versus 4 for carbs and protein. Cooking oils are ~100% fat, so a tablespoon (roughly 14 g) lands near 120 kcal no matter what it says on the bottle. What changes between oils is the kind of fat and the smoke point, not the calories:

Read that column of calories again: they're all within a rounding error of each other. This is the same pattern behind every honest Indian-food breakdown — the base is predictable, and the fat you cook it in is the swing variable. For dozens more staples in this format, see our calories and macros of common Indian foods guide.

So does the type of oil matter at all?

Yes — just not for the number on the scale. It matters for your heart and for what you're cooking.

Fatty-acid profile (this is the real difference)

Oils differ in the balance of monounsaturated (MUFA), polyunsaturated (PUFA) and saturated fats they carry:

• Mustard oil is high in monounsaturated fat and one of the few kitchen oils with meaningful omega-3 (ALA) — a genuinely favourable profile, and a reason it earns its place in Indian kitchens.
• Olive oil (especially extra-virgin) brings monounsaturated fat plus polyphenols, and Mediterranean-diet research consistently ties it to better heart outcomes — but it's pricey and its flavour and lower smoke point don't suit every Indian dish.
• Refined sunflower/soybean oils are heavy in omega-6 PUFA. Not "bad," but a diet already high in omega-6 benefits from balancing it with omega-3 and MUFA sources.
• Coconut oil and ghee are high in saturated fat. Fine in measured amounts, but no, coconut oil's MCTs don't make it a fat-burner — the same over-stretched claim we unpack for ghee and weight loss.

Because no single oil is perfect on every fatty acid, India's ICMR-NIN dietary guidelines actually recommend using a variety of oils rather than sticking to one — rotating, say, mustard and groundnut for cooking with a little olive oil for salads.

Smoke point: match the oil to the method

Every oil has a temperature — its smoke point — beyond which it starts to break down, smoke and form harsh, potentially harmful compounds. High-smoke-point oils (mustard, groundnut, rice bran, refined oils, ghee) handle Indian frying and tadka well. Extra-virgin olive oil has a lower smoke point, so it's better drizzled cold or used on low heat than smoking in a kadhai. And whatever you use, don't reuse the same frying oil over and over — repeatedly reheated oil degrades and is one of the least healthy things you can cook with.

The real villain isn't any of these oils — it's trans fat

If there's one fat to actually avoid, it's industrial trans fat: vanaspati / dalda (partially hydrogenated oil), old reused frying oil, and the deep-fried bakery and street food made with them. Trans fats are strongly linked to heart disease. India's food regulator, the FSSAI, has capped industrial trans fatty acids in oils and fats at 2% (in force since January 2022, down from 5%), which is real progress — but reheated oil and vanaspati-based fried food are still worth steering clear of, quite apart from their calories.

How much oil per day for weight loss?

This is the number that actually moves the scale. ICMR-NIN guidance puts total visible fat — all your cooking oil and ghee combined — broadly in the 20–50 g a day range, and people trying to lose weight are usually better toward the lower end, around 4–5 teaspoons (≈ 20–25 g) across the whole day. There's no magic figure; it just has to fit your calorie and fat targets. Where it goes wrong is almost always the same handful of places:

• The free-hand pour. A "little oil" glugged straight from the bottle into a hot kadhai is easily 2–3 tablespoons — 250–360 kcal of pure fat before a single ingredient goes in. Measure it with a spoon.
• Deep-frying. Pakoras, puris and bhajiyas soak up far more oil than shallow-cooked food. It's not the oil's fault — it's the volume the food absorbs.
• Restaurant and takeaway food. Kitchens cook in oil you never see. This is a big reason home-cooked, measured meals win for weight loss — and why our healthy Swiggy & Zomato ordering guide leans on grilled and tandoori over fried.
• Stacking fats. Cooking in oil and finishing with ghee and adding butter is three calorie-dense fats on one plate. Choose one, measure it, move on.

Practical wins: use a non-stick pan so less oil is needed, air-fry or roast instead of deep-frying, brush oil on rather than pour, and build the plate around protein and vegetables so fat isn't doing all the work of making the meal satisfying.

The honest verdict

The "best oil for weight loss" is a bit of a trick question. For calories, they're near-identical, so the honest answer is: the oil you use the least of. For health, favour oils with a better fat profile — mustard and groundnut for Indian cooking, a little olive oil for salads, ghee kept measured — and rotate them rather than obsessing over one. Then aim your energy where it actually counts: the total amount of fat on your plate across the day. Do that and the choice of bottle becomes a footnote, not the plan. It matters far less than a full Indian diet plan built around your own numbers.

A note on health

This article is general educational content, not medical advice. If you have high cholesterol, heart disease, diabetes or any condition affecting how much or which fats you should eat, follow your doctor's or a registered dietitian's guidance. Approximate calorie and smoke-point values are typical figures that vary by oil grade, brand and processing.

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