Going keto means cooking with more fat, and the moment you start looking into which fat, the internet appears with tubs of premium coconut oil, jars of ghee and bottles of MCT oil, all promising special powers and all carrying special prices. Here is the liberating truth: you do not need any of it. Some of the best cooking fats for keto are cheap, traditional and sitting in the ordinary aisle, and chasing the fashionable ones is mostly money spent on marketing. This is a guide to what to actually keep in the cupboard, which fat to reach for when, and where the hype quietly evaporates.

The cheap traditional workhorses

Start here, because this is most of what you need. Lard, rendered pork fat, is excellent: cheap, stable at high heat, traditional, and it gives a flavour and crispness to roast and fried food that nothing trendy improves on. Beef dripping or tallow does the same job and is superb for roasting and for frying a steak. Butter is the everyday flavour fat, wonderful on vegetables and for gentle cooking, with the only caveat that it burns at high heat, so clarify it or mix it with an oil if you are going hot. And olive oil is the all-rounder, cheap in its ordinary form for cooking and worth a better bottle for finishing, healthy, and the backbone of the Mediterranean way of eating. Between lard or dripping, butter and olive oil, you can cook almost anything well, for very little money.

If you want one more traditional fat for the pleasure of it, duck or goose fat roasts vegetables beautifully and keeps for ages in the fridge, though a tub of lard does nearly the same job for a fraction of the price. Treat it as a small luxury rather than a staple.

Match the fat to the heat

The one real technical point is heat. Every fat has a temperature at which it starts to smoke and break down, and cooking past it tastes acrid and is best avoided. Animal fats like lard and tallow, and refined oils, tolerate high temperatures well, so they are your choice for searing, frying and hot roasting. Butter and extra virgin olive oil are happier at low to medium heat; butter genuinely burns if you push it, while olive oil copes with the great majority of home cooking despite the myth that it cannot be heated at all. A simple way to think about it: keep one high-heat fat and one flavour fat within reach, and you have every situation covered without owning a shelf of bottles.

Fats you finish with rather than cook

Not every fat belongs in a hot pan. Some earn their place cold, poured over food at the end, and this is where a better olive oil pays off. A good extra virgin oil trickled over grilled vegetables, eggs or a piece of fish adds flavour that no amount of frying will give you. Cold-pressed rapeseed, walnut oil and a splash of sesame oil work the same way, in dressings and over finished dishes, where their flavour survives because you are not cooking it out. Keeping one everyday oil for the pan and one nicer oil for finishing is a small habit that lifts plain keto food a long way, and it costs almost nothing to adopt.

What about avocado oil and the other premium bottles

Avocado oil is the darling of keto blogs: neutral, high smoke point, respectable fat profile. It is genuinely fine. It is also several times the price of rapeseed oil for a very similar job in the pan, so buy it if you enjoy it and skip it without a second thought if you do not. The same logic applies to the parade of cold-pressed, single-origin, artisan oils that market themselves at keto shoppers. None of them is doing something your lard and olive oil cannot. The diet does not get more effective as the bottle gets more expensive, and your ketosis cannot tell the difference.

The hype you can skip

Now the fashionable fats, and why you can relax about them. Coconut oil is perfectly usable, but it is pricey, carries a strong flavour that does not suit everything, is very high in saturated fat, and the claims that its medium-chain fats supercharge your metabolism are overblown for ordinary coconut oil. Ghee is simply clarified butter; it is lovely and good for high heat, but you are paying a premium for something you could make from a block of butter in ten minutes or, most of the time, just cook with butter instead. MCT oil is a supplement rather than a cooking fat and stays entirely optional; if you are curious where it fits, the bulletproof coffee question covers it. A keto diet built on lard, butter and olive oil is cheaper and every bit as good as one built on the boutique jars.

An honest word on seed oils

No fat topic escapes the seed-oil argument, so here is the balanced version. The dramatic claim that ordinary vegetable and seed oils, sunflower, rapeseed, soybean, are toxic poisons does not hold up to the evidence; these oils are cheap, and rapeseed oil in particular is perfectly reasonable for everyday cooking. The fair points against them are gentler: they are highly processed rather than whole-food fats, and the real trouble is less the oil in your own kitchen than the vast amounts of it people eat through fried takeaways and ultra-processed food. So you need not fear a bottle of rapeseed oil, and you also need not build your diet around industrial seed oils when whole-food fats taste better and sit more comfortably. Use them if you like without panic, lean on olive oil and animal fats as your defaults, and ignore both the scaremongering and the dogma.

How much fat to actually add

There is a beginner trap worth naming here. Because keto is a high-fat diet, people assume the goal is to pour on as much fat as possible, drowning meals in butter and adding a spoon of oil to everything. Fat is a lever for satiety and for hitting your energy needs, not a target to maximise. If you are eating to lose weight, extra added fat is extra energy your body will burn before it touches your own stores, so a river of butter can quietly stall the scale. Use enough fat to make food satisfying and to keep you full between meals, then stop. The role of dietary fat and where added fat helps or hinders is worth understanding properly, and the way saturated fat fits into all this is a related question people fret about more than they need to.

Storing your fats so they last

Fats go off, and rancid oil tastes stale and does you no favours. Keep olive oil and delicate cold-pressed oils in a cool, dark cupboard with the lid on, away from the hob, since heat and light are what turn them. Buy nut oils in small bottles because they spoil faster once opened. Lard, dripping and duck fat keep happily in the fridge for weeks and even months. Butter freezes well if you buy it on offer. A quick sniff tells you everything: fresh fat smells clean and neutral, off fat smells sharp and paint-like, and once it does, bin it rather than cook with it.

The practical kit

In practice your whole keto fat cupboard can be three things: a tub of lard or beef dripping for frying and roasting, butter for flavour and gentle cooking, and olive oil for nearly everything else, with a cheaper neutral oil around if you want one for high-heat jobs and a nicer bottle for finishing. That covers every meal, costs little, and aligns with the budget and whole-food approach the rest of the site keeps coming back to. The fancy fats can stay on the shelf.

The bottom line

The best fats and oils for keto are the cheap, traditional ones: lard and dripping for high heat, butter for flavour, olive oil for nearly everything, and a second nicer oil for finishing if you enjoy it. They are healthy, inexpensive and better than the premium alternatives for most jobs. Coconut oil, ghee, avocado oil and MCT oil are optional luxuries with marketing attached rather than requirements, the seed-oil panic is overdone even where whole-food fats are the sensible default, and the goal is enough fat to satisfy rather than as much as you can pile on. Keep it simple and cheap, and your frying pan is sorted.

This is general information about the ketogenic diet, not medical advice. If you have high cholesterol or heart disease, see the cholesterol guidance and your doctor about fat choices. Keto does not suit everyone; if you are pregnant, on medication, or managing a condition such as diabetes, speak to a doctor or dietitian first.