You lose hair every day, so there’s no need to freak out every time a few follicles fall out.

That said, some strands reach a point where they don't grow back. It boils down to genetics: Some guys have fewer strands growing in to replace them. By the age of 35, two-thirds of American men will experience some level of hair loss, according to the American Hair Loss Association.

Lifestyle also comes into play. Nutritional deficiencies can contribute to increased hair loss by weakening hair shafts that cause breakage and slow re-growth of new hairs.

This can potentially be reversed with the right diet. Len Glassman, a certified health nutritionist, trainer, and owner of the Personal Best Training Center, offers up the necessary nutrients that'll help keep the hairs on your head.