BMR (Basal Metabolism Rate)
The level of energy needed to keep involuntary body processes going. These processes include heartbeat, breathing, generating body heat, perspiring to keep cool, and transmitting messages to the brain .
Some of the calories people ingest are used for basal metabolism. As people get old, their bodies require fewer calories for this basic upkeep. Some calories are excreted as waste products.
1. Weight training tones your muscles which looks great and raises your basal metabolism...which causes you to burn more calories 24 hours-a-day. You'll even burn more calories while you're sleeping.
Reference: Harris, J.A, and Benedict, F.G., A biometric study of basal metabolism in man. Publ. No. 279, Washington DC; Carnegie Institute 1919
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Fat Free body tissue, comprising mostly muscle. Lean mass is the primary determinant of the body's basal metabolism (calories you burn at rest). In healthy men, bodyfat (bodyweight minus lean body mass) ranges from 8-12%; in women, 18-22%.
"Any time a person drops below 1,200 calories [a day], the body shows signs of slower basal metabolism," Aldana says. Talbott cites research that shows anything less than 1,000 calories per day would prompt slower metabolism.
Energy Balance -The bodily process of using as much energy as it is provided through nutrition. This includes energy expenditure through basal metabolism, physical activity and thermogenesis.
 See also: Exercise, Metabolism, Energy, Calorie, Fat
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