Oil has long been a kitchen staple. A drizzle of olive oil over vegetables, a splash in the frying pan or a generous pour into a salad dressing can seem insignificant. But those small amounts can quickly add up. One tablespoon of olive oil contains around 120 calories and 14g of fat, and other commonly used cooking oils are similarly calorie-dense. Avocado oil, for example, provides around 124 calories per tablespoon.
That is one reason cooking without oil has become increasingly popular, particularly among people trying to lose weight, manage their calorie intake or simply make everyday meals lighter.
The appeal is simple: remove the added oil and you remove its calories, without necessarily reducing the size of the meal. If someone normally uses two tablespoons of oil when cooking dinner, switching to an oil-free method could save roughly 240 calories. Over a week, that could amount to more than 1,600 calories, provided those calories aren’t replaced elsewhere.
Cooking without oil does not mean sacrificing flavour. Instead, it encourages cooks to experiment with different techniques. Air frying, steaming, roasting, baking, grilling, poaching and sautéing with a splash of water or stockcan all produce flavourful food without relying on added fat. Non-stick cookware can also make it easier to cook ingredients such as onions, garlic, mushrooms and vegetables with little or no oil.
There are plenty of ways to build flavour, too. Try lemon or lime juice, vinegar, herbs, spices, chilli, garlic, ginger, mustard, tomato, soy sauce or low-calorie stocks. For roasted vegetables, seasoning them well and using a hot oven can create plenty of caramelisation and flavour without an oily coating.
The weight-management argument is particularly interesting. Foods with a lower energy density contain fewer calories for their weight, meaning you can often eat a larger, more satisfying portion for the same number of calories. Fruit, vegetables, pulses and other water- and fibre-rich foods are examples. Reducing added fats can lower the overall energy density of a meal, potentially making it easier to stay within a calorie deficit.
There is an important distinction, however. Oil is not inherently unhealthy. Olive, rapeseed and other unsaturated oils can be part of a balanced diet, and dietary fat plays important roles in the body. The issue for anyone counting calories is that oil is extremely energy-dense, so portions can be easy to underestimate. The NHS specifically recommends using oils and spreads in small amounts and measuring them when cooking. The thing is, we are exposed to these oils without trying – by eating out, processed foods etc., so these suggestions are to help us minimise intake overall.
Ultimately, cooking without oil is less about declaring oil “bad” and more about having another useful tool. For people looking to create a calorie deficit without dramatically shrinking their meals, it can be a surprisingly simple change.
Easy oil-free swap-outs
- Frying oil → water or vegetable stock: Sauté onions, garlic and vegetables in a splash of water or stock, adding more as the pan dries.
- Oil for roasting → baking paper or a non-stick tray: Roast vegetables at a high temperature and season generously for caramelisation and flavour.
- Oil-coated potatoes → air fryer: Try wedges or roast potatoes in an air fryer, using seasoning, garlic and herbs instead of oil.
- Oil-based salad dressing → lemon juice or vinegar: Balsamic, red wine vinegar, lemon and lime juice can add plenty of acidity and flavour.
- Oil in marinades → yoghurt, lemon or spices: Use yoghurt, mustard, citrus juice, garlic and herbs to create flavourful marinades without added oil.
- Oil for stir-fries → stock: Keep the pan hot and add small splashes of stock or water as ingredients cook.
- Oil for baking → mashed banana or apple purée: In some cakes and muffins, fruit purées can replace part of the fat while adding moisture.
- Oil for crispy food → air fryer or oven: A high-temperature cooking method can help create crisp edges without deep-frying.
Smart tips for cooking without oil
- Invest in a good non-stick pan. It makes cooking eggs, vegetables and lean proteins without oil much easier.
- Build flavour elsewhere. Garlic, ginger, chilli, smoked paprika, cumin, herbs, mustard, citrus and vinegar can make food exciting without adding significant calories.
- Use stock strategically. A splash can prevent ingredients sticking while adding savoury flavour.
- Don’t confuse oil-free with fat-free. Nuts, seeds, avocado, oily fish and olive oil can all be nutritious sources of unsaturated fat. The NHS recommends choosing unsaturated oils and spreads, but keeping portions small because all fats are calorie-dense.
- Measure rather than pour. If you don’t want to eliminate oil completely, measuring it with a teaspoon can prevent accidental over-pouring.
- Remember the calorie maths. One tablespoon of olive oil is around 120 calories, so removing two tablespoons from a meal could save roughly 240 calories.
- Think about the whole meal. Saving calories on oil is most useful when those calories aren’t simply replaced with larger portions of cheese, sauces or other calorie-dense ingredients.
- Prioritise volume and fibre. Fill meals with vegetables, beans, pulses and other high-fibre foods to make a calorie-controlled meal more satisfying.
- You don’t have to go completely oil-free. Even reducing the amount you normally use can make a meaningful difference to total calorie intake.