Saturated, Trans Fats: Saturated and trans fats greatly increase bad cholesterol in the blood. If cholesterol increases in the body, your risk of heart disease increases significantly. That's why doctors recommend reducing the intake of red meat, full-fat dairy products, and foods made with hydrogenated oils. Instead, eat foods that contain monounsaturated and polyunsaturated fats, such as almonds, walnuts, olive oil, and avocados.