The types of fats in your diet can affect the development of diabetes.

Good fats, such as the polyunsaturated fats found in liquid vegetable oils, nuts, and seeds, can help ward off type 2 diabetes (16), whereas trans fats do the opposite. (6, 17)

If you already have diabetes, eating fish can help protect you against a heart attack or dying from heart disease. (25) Eating omega-3 fats from fish does not protect against diabetes, even though there is much evidence that these marine omega-3 fats help prevent fatal heart disease. (26)