Are carbohydrates good for the growth of muscles and hair?

The answer is yes they are good for the muscles and hair

All that extra energy gives your follicles a boost, too: of two groups who spent six months on either a low-carb or a low-fat diet, the latter were 24% less likely to report hair loss, say Philadelphia University researchers. It could be down to the nutrients in fortified cereals: just 50g of cornflakes gives you your full RDA of cell growth-promoter folic acid.