Is having a fast metabolism, 23 y/o male, good for me? if not how do i slow it down? my body seems to burn right through anything i eat swiftly. slim

Would not be worried: So called fast metabolism may not persist, and u will start gaining weight as you age. You do not need to be fat to suffer from metabolic side effects of poor diet and lack of exercise. Significant proportion of diabetes and pre diabetes patient are lean. My advise- eat healthy diet and do regular exercise 20 minutes/day 5days/week.