Can your BF % be too low?

7% is probably the lowest you can go without getting some adverse effects. The less fat you have, the less leptin you have circulating in your system. Leptin is the satiety hormone. This is why it is harder for people to maintain a low level of bodyfat. They get hungrier. Leptin also regulates testosterone. You will probably see optimal function anywhere from 8%-15% Bf
 
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