The low-fat cooking movement of the 1980s and 1990s produced a generation of cooks who understand fat primarily as something to reduce. This produced a lot of food that was correct in its macronutrient profile and inadequate in every other sense. The rehabilitation of fat in cooking culture has been happening slowly, mostly through the influence of professional cooking and nutritional science both arriving at similar conclusions from different directions. But the rehabilitation isn’t complete, and the underlying misunderstanding is still common.
Fat is not an indulgence layered on top of food that would be fine without it. It’s a structural component of most cooking, performing specific technical functions that nothing else does quite as well.
What fat does
Fat carries flavour. Aromatic compounds — the molecules responsible for the smell and taste of herbs, spices, garlic, onion — are fat-soluble rather than water-soluble. They release more fully in fat than in water. This is why cooking garlic in oil before adding it to a dish produces a different and more developed flavour than adding garlic to water and then adding oil. The fat is doing extraction work.
Fat enables the Maillard reaction. Browning — the chemical process that creates the dark crust on seared meat, fried onions, roasted vegetables — requires heat above 140°C at the surface of the food. Water, which boils at 100°C, caps the temperature at that point; food in contact with water cannot get above 100°C, regardless of how hot the water is. Fat has a much higher smoke point and allows the surface of food to reach the temperatures needed for browning. This is why you dry food before searing — any water on the surface of meat prevents the browning that fat makes possible.
Fat provides texture. The richness of a sauce, the creaminess of a soup, the silkiness of a risotto — these are all fat-related textures. The mantecatura in risotto (beating in cold butter at the end) suspends fat droplets in the starchy liquid, creating an emulsion that coats the palate in a way that no fat-free sauce can replicate. Crème fraîche stirred into a braise, cream in a soup, butter in a pan sauce — all creating a specific texture that fat is uniquely suited to produce.
Which fat for what
Olive oil for most Mediterranean cooking, for dressings and finishing, for dishes where the flavour of the fat should be present. Extra virgin olive oil is for finishing, dressing, and low-heat applications — it has a lower smoke point and a flavour that’s too pronounced for high-heat cooking in most contexts. Regular olive oil is better for sautéing and roasting.
Butter for richness, for finishing sauces, for baking, for dishes where a distinct fat flavour is wanted. Brown butter — butter heated until the milk solids toast — has a nutty, complex flavour that is one of the most versatile and underused things in the kitchen.
Neutral oil (sunflower, rapeseed, vegetable) for high-heat cooking where the fat flavour should be invisible: deep frying, searing, wok cooking. These oils have high smoke points and don’t interfere with the flavour of the food.
Animal fats — duck fat, lard, beef dripping — for specific applications where their flavour is an asset: roasting potatoes in duck fat, frying in lard for certain applications, cooking with dripping for traditional dishes. These are not universally applicable but are worth understanding.
The quality question
Fat quality matters more than fat quantity in most cooking. A dish made with a generous amount of good olive oil tastes better than the same dish made with twice as much mediocre oil. Extra virgin olive oil of actual quality — green and peppery, not pale and flavorless — is a different ingredient from the cheapest supermarket bottle in all but its basic chemical structure.
This is equally true for butter. Good butter has flavour and fat content that cheaper butter doesn’t. In applications where the fat is the flavour — a simple pasta with butter, a pan sauce, a beurre blanc — the quality of the butter is a primary variable.
Fat is not a shortcut to making food taste better. It’s a structural element of how food tastes, performs, and satisfies. Understanding it makes better cooking possible — and more honest cooking too.