Calories from fats refer to the energy provided by dietary fats in food. Fats are one of the three main macronutrients, alongside carbohydrates and proteins. Each gram of fat contains about 9 calories, making it the most calorie-dense macronutrient. Fats play essential roles in the body, including supporting cell structure and hormone production. There are different types of fats, including saturated, unsaturated, and trans fats. Unsaturated fats, found in foods like avocados and nuts, are generally considered healthier than saturated fats, which are often found in animal products. Balancing fat intake is important for overall health and energy management.