Low-density lipoprotein A form of cholesterol that circulates in the blood. Commonly called “bad” cholesterol. Registered Dietitian A health professional who is a food and nutrition expert. Hydrogenation A chemical way to turn liquid fat oil into solid fat. This process creates a new fat called trans fatty acids. Weight-cycle: Losing and gaining weight over and over again. Commonly called yo-yo dieting. Bioelectrical impedance analysis A way to estimate the amount of body weight that is fat and nonfat. Nonfat weight comes from bone muscle body water organs and other body tissues. BIA works by measuring how difficult it is for a harmless electrical current to move through the body. Unsaturated fat: A fat that is liquid at room temperature. Vegetable oils are unsaturated fats. 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. Glucose A building block for most carbohydrates. Digestion causes carbohydrates to break down into glucose. Nutrition The process of the body using food to sustain life.