Monounsaturated and polyunsaturated fats are examples of healthy fats. Avocados, fish, and olive oil are sources of these fats. Fats are macronutrients, or nutrients your body needs in large amounts.

For example, someone consuming a high-fat diet that's also rich in nutritious foods like vegetables, fruits, beans, and fish, won't have the same heart health risks as a person following a diet ...

While these fats can enhance the flavor and texture of meals, they can also increase your low-density lipoprotein (LDL) cholesterol—considered your "bad" cholesterol—and have other health effects.