| Term | Definition |
| Leptin | A hormone that appears to depress appetite |
| Ghrelin | A hormone that contributes to feelings of hunger |
| Energy Balance | The state of consuming a number of calories that is equal to the number expended. Over the long term, this results in maintenance of a constant body weight. Also known as "energy in/energy out." |
| Resting Metabolic Rate (RMR) | The amount of energy expended during all sedentary activities |
| Exercise Metabolic Rate (EMR) | The amount of energy expended during any form of exercise |
| Anorexia Nervosa | An eating disorder in which a person severely restricts caloric intake because of an intense fear of gaining weight |
| Bulimia Nervosa | An eating disorder that involves overeating (called "binge eating") followed by vomiting (called "purging") |
| Binge Eating Disorder | The compulsive need to gorge on food without purging |