Why MUSCLE Makes You Lean
It's the most metabolically active tissue there is. Thus, the more muscle you have, the more calories you burn - even at rest.
So when you increase muscle mass, you rev up your metabolism - all day all night. By contrast, persons who don't exercise and go on a weight-loss diet usually lose muscle mass. These people tend
to regain lost weight more easily because their low levels of muscle mass decrease their metabolic rates (i.e., the rate they burn calories).
That's why physicians and researchers have begun to emphasize the value of weight training as an extremely important component of long-term weight management.
Programs stressing caloric restriction without exercise cause decreases in lean body mass: a negative nitrogen balance (i.e., protein losses in the body); diminished muscle strength; and often,
impaired immune function.(By including weight training in the weight-reduction program, you are more likely to spare lean body mass and maintain a positive nitrogen balance.
Weight training also improves muscular strength and endurance, even during caloric restriction. Previously untrained individuals commonly experience improvements in strength of 20% or more
when weight training and dieting simultaneously.