Unsaturated fats are found in many nutrient-rich foods and can be an important part of a balanced eating pattern. They include monounsaturated fats and polyunsaturated fats, a broad group that contains essential omega-3 and omega-6 fatty acids. Choosing these fats in place of foods higher in saturated fat can add flavor and valuable nutrients to everyday meals.
What are unsaturated fats?
Unsaturated fats contain one or more double bonds in their fatty acid structure. Their two main categories are:
- Monounsaturated fats: Found in foods such as olive oil, avocados, peanuts, almonds, cashews, and pistachios. Oleic acid is a common monounsaturated fatty acid in olive oil and many nuts.
- Polyunsaturated fats: Found in fatty fish, seeds, walnuts, and several plant oils. This group includes omega-3 and omega-6 fatty acids, which the body cannot make in sufficient amounts and must obtain from food.
Alpha-linolenic acid (ALA), found in flaxseed and chia seeds, is a plant-based omega-3 fatty acid. Linoleic acid is an omega-6 fatty acid found in foods including seeds, nuts, and vegetable oils. Fatty fish provide the long-chain omega-3 fats EPA and DHA.
Best food sources of unsaturated fats
Oils and spreads
Extra virgin olive oil is a versatile source of monounsaturated fat. Use it in salad dressings, marinades, dips, or moderate-heat cooking. Avocado oil is another option, and refined avocado oil can be used when a higher-heat cooking method is needed.
Nuts and seeds
Almonds, walnuts, cashews, pistachios, peanuts, and natural peanut butter provide unsaturated fats alongside protein and other nutrients. Flaxseed, chia, hemp, and sunflower seeds can be added to oatmeal, yogurt, salads, smoothies, or baked dishes. Ground flaxseed is often easier to incorporate into meals than whole seeds.
Avocados
Avocados provide mostly monounsaturated fat as well as fiber, potassium, and vitamins. Add sliced avocado to a salad or sandwich, mash it onto toast, or use it as a creamy ingredient in a meal.
Fatty fish
Salmon, sardines, and mackerel are notable sources of EPA and DHA, the long-chain omega-3 fats. Including these fish in meals is one way to obtain omega-3s in a form that differs from the ALA found in plant foods.
Other plant foods
Soybean products, walnuts, flaxseed, chia seeds, and some vegetable oils provide polyunsaturated fats. Sunflower, safflower, corn, and soybean oils are particularly rich in omega-6 fats. These are essential fats, but a varied diet that also includes omega-3 sources provides a broader range of fatty acids.
How to use unsaturated fats in cooking
Different fats suit different cooking methods. Olive oil works well in dressings, for finishing dishes, and for moderate-temperature sautéing. Oils high in polyunsaturated fats are generally more sensitive to heat, air, and light. Delicate oils such as flaxseed oil are best used without heating, for example in a dressing or stirred into food after cooking.
- Keep oils tightly sealed when not in use.
- Store them away from heat and direct light, preferably in dark or opaque containers.
- Refrigerate delicate oils according to their storage instructions.
- Discard oils that develop an unpleasant stale or rancid smell.
For high-heat cooking, choose an oil intended for that purpose and avoid overheating it until it smokes. Cooking briefly or using controlled oven temperatures can also limit unnecessary heat exposure.
Building meals around unsaturated fats
The simplest approach is to use unsaturated fats as replacements rather than adding large amounts on top of an already full meal. For example, replace butter in a dressing with olive oil, choose nuts instead of a highly processed snack, or serve avocado with a meal that would otherwise contain a high-saturated-fat spread.
- Breakfast: Add ground flaxseed and walnuts to oatmeal or yogurt.
- Lunch: Make a salad with olive oil and lemon dressing, avocado, beans, or fish.
- Snack: Choose a modest portion of almonds, pistachios, or natural peanut butter.
- Dinner: Include fatty fish when suitable and rotate among seeds, nuts, legumes, and plant oils.
Unsaturated fats are calorie dense, so portion size still matters. A balanced plate can combine a source of unsaturated fat with vegetables or fruit, a protein food, and a fiber-rich carbohydrate. People managing a medical condition, taking medication, or following a specific calorie plan may benefit from individualized advice from a healthcare professional or registered dietitian.
Key points
Useful unsaturated fats sources include olive oil, avocados, nuts, seeds, soy foods, and fatty fish. A combination of monounsaturated fats, plant-based ALA, and fish-derived omega-3s can add variety to the diet. By choosing these foods in place of higher-saturated-fat options, storing oils carefully, and keeping portions appropriate, you can make unsaturated fats a practical part of everyday meals.