06 Mar 2013 Fat is one of the macronutrients providing the body with energy and essential nutrients. Fat is the most energy dense of the macronutrients providing nine calories per gram versus four calories per gram found in carbohydrates and proteins. Fat has many essential functions including nutrient absorption and hormone production. A common misconception says eating fat makes you fat. The truth is excess energy from any macronutrient (fats, carbs or proteins) leads to weight gain. Unsaturated fats, also known as healthy or good fats, decrease cholesterol levels and reduce your risk of developing cardiovascular disease. Cutting all fats out of your diet results in missing out on some important health benefits.