Yes, an increase in muscle mass usually does mean that your metabolism will be higher--if you remain lean without starving yourself. Consider Sumo Wrestlers who have quite a bit of lean body weight but they also have a lot of adipose tissue as well (fat). In that case I don't think their metabolism is significantly higher.
I always try to keep in mind that my muscles ARE my metabolism.
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Yes. The more lean muscle mass you have, the greater your metabolic rate. A quantity of muscle burns several dozen times more calories than an identical quantity of fatty tissue.
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