Monounsaturated fat Fats that are in foods are combinations of monounsaturated polyunsaturated and saturated fatty acids. Body mass index A measure of body weight relative to height. BMI can be used to determine if people are at a healthy weight overweight or obese. 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. Weight-cycle: Losing and gaining weight over and over again. Commonly called yo-yo dieting. Overweight Refers to an excess of body weight compared to set standards. The excess weight may come from muscle bone fat and/or body water. Obesity Having a high amount of body fat. Trans fatty acids: A fat that is produced when liquid fat oil is turned into solid fat through a chemical process called hydrogenation 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. Gestational diabetes A type of diabetes mellitus that can occur when a woman is pregnant.