1. Tuna. The Omega-3 fatty acids contained in tuna make it a great high metabolism food. These fatty acids decrease the levels of leptin in the body, which is responsible for high metabolism levels. 2. Oatmeal. This is a complex carbohydrate, and one of the better known foods that boost your metabolism. As it is complex, your body takes longer to break it down than other carbohydrates. It is also high in fiber, which is a beneficial combination, because you won’t have that insulin spike after you eat, as the glucose gets released in smaller doses. Read more