I recently watched a science video in which the presenter argues that having more lean mass aids burning more calories.
The below is the summary of what she said:
Having more lean mass means more calories are burned. I have increased my lean mass by 7 pounds and therefore the basic metabolic rate in me can burn 1600 calories instead of 1200.
She also associates this with sarcopenia.
The body's muscle mass degenerates as we age (Sarcopenia). This is the reason why we are not able to eat more food as grow older.
Is this claim true? Does increasing the lean mass increase the over all metabolism rate?