Healthy fats

Healthy fats are a mainstay of the Mediterranean diet. They're eaten instead of less healthy fats, such as saturated and trans fats, which contribute to heart disease.

Olive oil is the primary source of added fat in the Mediterranean diet. Olive oil provides monounsaturated fat, which has been found to lower total cholesterol and low-density lipoprotein (LDL or "bad") cholesterol levels. Nuts and seeds also contain monounsaturated fat.

Fish are also important in the Mediterranean diet. Fatty fish — such as mackerel, herring, sardines, albacore tuna, salmon and lake trout — are rich in omega-3 fatty acids, a type of polyunsaturated fat that may reduce inflammation in the body. Omega-3 fatty acids also help decrease triglycerides, reduce blood clotting, and decrease the risk of stroke and heart failure.