| Amenorrhea | Absence of, or infrequent, menstruation.
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| Body Mass Index (BMI) | A measure of body composition using a height-weight formula. High BMI values have been related to increased disease risk.
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| Basal Metabolic Rate (BMR) | Energy expenditure in a basic, or rested, state.
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| Calories | A unit of energy supplied by food; the quantity of heat necessary to raise the temperature of a kilogram of water one degree centigrade (actually a kilocalorie but usually called a calorie for weight control purposes).
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| Caloric Balance | Consuming Calories in amounts equal to the number of Calories expended.
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| Diet | The usual food and drink for a person or animal.
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| Essential Fat | The minimum amount of fat in the body necessary to maintain healthful living.
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| Nonessential fat | Extra fat or fat reserves stored in the body.
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| Obesity | A clinical term for a condition that is characterized by an excessive amount of body fat.
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| Overweight | A clinical term that implies higher than normal levels of body fat and potential risk for development of obesity.
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| Percent Body Fat | The percentage of total body weight that is composed of fat
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| Set Point | A theoretical concept that describes the way the body protects current weight and resists change.
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| Somatotype | A term that refers to a person's individual body type. One researcher (Sheldon) suggested that there are three basic body types, ectomorph (linear), mesomorph (muscular), and endomorph (round).
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| Underfat | Too little of the body weight composed of fat.
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