Fat A long-term storage form for energy in humans. It is also one of the three main nutrients in food (besides carbohydrates and proteins). Foods high in fat include butter, oil, nuts, and some dairy products. Related Articles: 7 Tips for Healthy Eating While Working from Home10 Low-Carb Foods to Strengthen Your Immune SystemAn Overview of Intermittent FastingNigerian Cuisine and DiabetesHow to Read the New Food Label