Eat a handful of walnuts a day! According to a study in the Journal Of Cosmetic Dermatology, the omega-3 fatty acids in walnuts helped reverse hair loss in 90% of the women studied… and 87% of them reported growing thicker hair. The omega-3s in walnuts provide hair cells with the building blocks they need to function at their best. And walnuts have more omega-3s than any other nut. So eat a handful a day for thicker, healthier hair.