Being sedentary is bad for you, even if you are young and fit: your muscles will decrease in volume, quickly and easily, if they are unused. Moreover, loss of muscle mass is also associated with a loss of the production of molecules important for supporting new brain cells in the few regions of the brain that continue to produce new brain cells through life. As your muscles deteriorate, your brain is also deteriorating. Other malign changes occur too – in personality, in mood, in the very structure of the brain. And yet, we have this wonderful, in-built correction mechanism, a form of
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