Monounsaturated fat Fats that are in foods are combinations of monounsaturated polyunsaturated and saturated fatty acids. High-density lipoprotein A form of cholesterol that circulates in the blood. Commonly called “good” cholesterol. Polyunsaturated fat A highly unsaturated fat that is liquid at room temperature. Fat A major source of energy in the diet. All food fats have 9 calories per gram. Diabetes Mellitus A disease that occurs when the body is not able to use blood glucose sugar. Blood sugar levels are controlled by insulin a hormone in the body that helps move glucose sugar from the blood to muscles and other tissues. Weight-cycle: Losing and gaining weight over and over again. Commonly called yo-yo dieting. Nutrition The process of the body using food to sustain life. Metabolism All of the processes that occur in the body that turn the food you eat into energy your body can use. Carbohydrate A major source of energy in the diet. There are two kinds of carbohydrates simple carbohydrates and complex carbohydrates. Energy expenditure The amount of energy measured in calories that a person uses. Calories are used by people to breath circulate blood digest food and be physically active.