If you want to support long-term health, don’t try to eliminate fat from your diet. Instead, choose unsaturated fats more often and limit foods high in saturated fat and industrial trans fat. Four particularly useful choices are olive oil, nuts and seeds, avocados, and fatty fish. Foods such as trans-fat-containing products, butter, lard, tallow, coconut and palm oils, and many fatty processed foods are better kept to a minimum.

The important point is that nutrition is not simply about labeling a food “good” or “bad.” What matters is the type of fat, the food it comes from, what you eat instead, and your overall dietary pattern. Current guidance from the World Health Organization and American Heart Association emphasizes replacing saturated fats with unsaturated fats rather than simply replacing fat with refined carbohydrates.

Are All Fats Bad for You?

No. Dietary fat is an essential nutrient.

Fat provides energy, helps the body absorb fat-soluble vitamins such as vitamins A, D, E and K, and contributes to cell structure and normal biological functions.

The problem is that different fats have different effects on health.

The main categories are:

• Monounsaturated fats (MUFA): found in olive oil, avocados and many nuts.
• Polyunsaturated fats (PUFA): found in nuts, seeds, many vegetable oils and fish.
• Omega-3 fatty acids: a type of polyunsaturated fat found especially in fatty fish, as well as some plant foods.
• Saturated fats: found in foods such as butter, fatty meats, full-fat dairy, coconut oil and palm oil.
• Trans fats: especially industrially produced trans fats, which are particularly harmful and should be avoided.

WHO recommends that dietary fat should come primarily from unsaturated fatty acids, while saturated fat should provide no more than 10% of total energy and trans fat less than 1%. WHO also recommends eliminating industrially produced trans fats where possible.

4 Healthy Fats to Eat More Often

1. Extra-Virgin Olive Oil

Olive oil is one of the easiest ways to replace a source of saturated fat with an unsaturated fat.

It is particularly rich in monounsaturated fat and is a staple of Mediterranean-style eating patterns.

Instead of automatically reaching for butter, try using olive oil for:

• Salad dressings
• Roasted vegetables
• Grain bowls
• Beans and lentils
• Homemade sauces
• Light sautéing

The goal isn’t to consume unlimited amounts. Olive oil is calorie-dense, so portion size still matters.

The bigger nutritional advantage comes from using olive oil in place of foods higher in saturated fat, rather than simply adding extra oil to an already energy-dense diet.

The American Heart Association specifically recommends non-tropical liquid plant oils, including olive oil, as alternatives to saturated-fat sources such as butter and coconut oil.

2. Nuts and Seeds

Nuts and seeds combine healthy fats with other valuable nutrients.

Good options include:

• Walnuts
• Almonds
• Pistachios
• Peanuts
• Chia seeds
• Flaxseeds
• Pumpkin seeds
• Sunflower seeds

They can make meals more satisfying while adding unsaturated fats, fiber and, depending on the food, protein and minerals.

Try adding a small handful of nuts to oatmeal or yogurt, sprinkling seeds over a salad, or using ground flaxseed in smoothies.

Choose unsalted or lightly salted varieties when possible, especially if you’re trying to reduce sodium.

And remember: nuts are nutritious but energy-dense. “Healthy fat” does not mean “eat unlimited amounts.”

3. Avocados

Avocados are another convenient source of predominantly monounsaturated fat.

They also provide fiber and several vitamins and minerals.

You can use avocado as:

• A spread instead of butter
• A topping for whole-grain toast
• An addition to salads
• A component of grain bowls
• A base for guacamole

Avocado can be especially useful when it helps replace a less nutritious topping or spread.

The broader evidence-based principle is simple: foods containing unsaturated fats, including avocados, nuts and fish, fit well into a heart-healthy dietary pattern.

4. Fatty Fish and Omega-3 Fats

Fatty fish provide long-chain omega-3 fatty acids, particularly EPA and DHA.

Examples include:

• Salmon
• Sardines
• Mackerel
• Herring
• Trout

Fish can be used as an alternative to some meals based around fatty or processed meats.

A practical approach is to include fish as part of a varied diet rather than focusing on one “superfood.”

For people who don’t eat fish, plant foods such as walnuts, chia seeds and flaxseeds provide alpha-linolenic acid (ALA), another omega-3 fatty acid.

People following vegan or vegetarian diets can discuss individual omega-3 needs with a qualified healthcare professional.

6 Sources of Fat to Limit

The phrase “bad fats” can be misleading. These foods aren’t necessarily poisonous or forbidden. The more useful approach is to identify foods that are high in saturated or trans fats and eat them less frequently or replace them with healthier alternatives.

1. Industrial Trans Fats

This is the clearest category to avoid.

Industrial trans fats can be produced when oils undergo partial hydrogenation. They have been used in some processed, fried and baked foods.

WHO states that industrially produced trans fats are not part of a healthy diet and should be avoided.

They can occur in some:

• Packaged baked goods
• Fried foods
• Shortenings
• Certain margarines
• Crackers
• Biscuits
• Pastries

Check ingredient lists for partially hydrogenated oils where applicable.

Trans fats are not something you need to seek out in your diet.

2. Butter and Ghee

Butter and ghee can add flavor, but they are relatively high in saturated fat.

The American Heart Association notes that excessive saturated fat can raise LDL cholesterol, which is associated with cardiovascular disease risk.

You don’t necessarily have to eliminate butter completely.

Instead, consider using it less often and replacing some of it with:

• Olive oil
• Canola oil
• Nut or seed spreads
• Avocado

This “replace rather than simply remove” approach is important.

3. Lard and Tallow

Lard and beef tallow are traditional cooking fats, but they contain substantial amounts of saturated fat.

Using them occasionally doesn’t automatically make an otherwise healthy diet unhealthy. However, if they are your primary cooking fats, replacing some of them with unsaturated plant oils can improve the overall fat profile of your diet.

This is consistent with current guidance recommending a shift away from saturated fat toward unsaturated fat.

4. Coconut and Palm Oil

This is one area where health headlines can become confusing.

Coconut oil is often marketed as a “healthy fat,” but it is high in saturated fat. The same applies to palm oil.

That doesn’t mean these foods are uniquely toxic. It means they shouldn’t automatically be treated like olive oil, nuts or fatty fish.

If you’re choosing an everyday cooking oil, a non-tropical liquid plant oil rich in unsaturated fat is generally a better default.

The American Heart Association specifically recommends choosing unsaturated plant oils instead of saturated-fat sources such as coconut oil.

5. Fatty Processed Meats

Bacon, sausages and other processed meats can contribute significant amounts of saturated fat, depending on the product.

They can also be high in sodium.

Instead of making processed meat a daily protein source, rotate meals around foods such as:

• Beans
• Lentils
• Fish
• Nuts
• Seeds
• Lean poultry
• Other minimally processed protein sources

This change improves more than just your fat intake—it can improve the overall quality of your diet.

6. Commercial Baked and Fried Foods

Think beyond the fat itself.

Cookies, pastries, doughnuts, fried snacks and similar foods may combine:

• Saturated fat
• Refined carbohydrates
• Added sugars
• Sodium
• High calorie density

Some products may also contain industrial trans fats depending on where they are produced and the ingredients used.

This doesn’t mean you can never enjoy dessert or fried food. It means these foods are better treated as occasional foods rather than everyday staples.

WHO specifically identifies many baked and fried foods and packaged snacks as potential sources of industrial trans fat, although regulations and formulations vary by country.

The Healthiest Fat Is Often the One You Use as a Replacement

One of the most important ideas to understand is that replacement matters.

Suppose you remove butter from your diet but replace it with a highly refined carbohydrate food. That isn’t necessarily the best nutritional trade.

A more useful swap looks like this:

The American Heart Association’s current 2026 dietary guidance continues to emphasize choosing unsaturated fats in place of saturated fats and focusing on minimally processed foods, vegetables, fruits, whole grains and healthy protein sources.

This is much more useful than simply asking, “Is this food high in fat?”

What About Fat and Weight Gain?

Healthy fats are still fats, and all dietary fats provide substantial energy.

So a food can be nutritious and still contribute to weight gain if total energy intake consistently exceeds your body’s needs.

That doesn’t mean you should avoid avocado, nuts or olive oil.

Instead, include them in reasonable portions as part of balanced meals.

WHO’s updated guidance emphasizes both the quantity and quality of dietary fat.

For example, a balanced lunch might include:

Salmon + vegetables + beans + whole grains + a small amount of olive oil.

That provides a very different nutritional package from:

Fried processed meat + refined bread + sugary drink.

The fat content alone doesn’t tell the whole story.

A Simple Daily Healthy-Fat Plan

You don’t need to calculate every gram of fat to make better choices.

Try these simple habits:

At breakfast

Add walnuts, chia seeds or ground flaxseed to oatmeal or yogurt.

At lunch

Use avocado or an olive-oil-based dressing in a salad or grain bowl.

At dinner

Choose salmon, sardines or another fish instead of processed meat when practical.

For cooking

Make an unsaturated liquid plant oil your everyday default rather than relying primarily on butter, lard or coconut oil.

For snacks

Choose nuts, seeds or nut butter with fruit instead of relying on packaged pastries and fried snacks.

When shopping

Look at the saturated fat and ingredient list, not just the large claims on the front of the package.

A Note About “Bad” Fats

It’s worth avoiding overly simplistic nutrition language.

There are no foods that need to be placed into a permanent “good” or “bad” category for everyone.

For example, cheese contains saturated fat but can still appear in a balanced eating pattern. Butter can be enjoyed occasionally. Coconut is not the same thing as an industrial trans-fat product.

The strongest recommendation applies to industrial trans fats, while saturated fats are generally something to limit and replace with healthier unsaturated fats.

WHO recommends keeping saturated fat below 10% of total energy intake and trans fat below 1%. The American Heart Association recommends an even lower saturated-fat target—less than 6% of calories—for people who need to lower LDL cholesterol or reduce cardiovascular risk.

Individual needs can differ, particularly for people with cardiovascular disease, diabetes, lipid disorders or other medical conditions.

FAQs About Healthy and Unhealthy Fats

What are the healthiest fats to eat?

Four practical choices are olive oil, nuts and seeds, avocados, and fatty fish. These foods provide predominantly unsaturated fats, and fatty fish also provides omega-3 fatty acids.

Which fats should I avoid?

Industrial trans fats should be avoided whenever possible. Foods high in saturated fat should generally be limited, particularly when healthier unsaturated alternatives are available.

Is olive oil better than butter?

For everyday use, olive oil is generally a better choice from a fat-quality perspective because it is predominantly unsaturated, while butter is high in saturated fat. Replacing butter with olive oil can therefore improve the overall fatty-acid profile of the diet.

Is avocado a healthy fat?

Yes. Avocado is rich in predominantly monounsaturated fat and also provides fiber and other nutrients. Portion size still matters because avocado is energy-dense.

Are nuts good for your heart?

Nuts are nutrient-dense foods that provide unsaturated fats, fiber and other nutrients. They fit well into a heart-healthy dietary pattern, especially when they replace less nutritious snack foods.

Is coconut oil a healthy fat?

Coconut oil is high in saturated fat. Although it can be used occasionally, it should not automatically be considered equivalent to unsaturated-fat sources such as olive or canola oil.

Are saturated fats always unhealthy?

Not every food containing saturated fat needs to be completely eliminated. However, high intake of saturated fat can raise LDL cholesterol, and major health organizations recommend limiting it and replacing it with unsaturated fats where practical.

Can eating healthy fats help you live longer?

No individual food can guarantee a longer life. However, dietary patterns rich in minimally processed foods, vegetables, fruits, whole grains, legumes, nuts and unsaturated fats are consistently associated with better long-term health outcomes. The overall dietary pattern matters much more than one ingredient.

Conclusion

If your goal is better health as you age, don’t fear fat—choose it strategically.

Make foods such as olive oil, nuts and seeds, avocados, and fatty fish regular parts of a varied diet. At the same time, limit industrial trans fats, butter and ghee, lard and tallow, coconut and palm oils, fatty processed meats, and heavily fried or packaged foods.

Most importantly, think about what you’re replacing. Swapping saturated fats for unsaturated fats is generally more useful than simply trying to eat as little fat as possible. Current WHO and American Heart Association guidance supports this overall approach.

A long, healthy life cannot be guaranteed by four foods—or prevented by six foods. But building a dietary pattern around minimally processed foods and healthier sources of fat is a practical step toward better long-term nutrition.