The Connection
When you eat an insufficient amount of protein, the lack makes your body want to conserve energy. It does this by sending more of your hairs into the resting stage, according to Caserio. Because the primary component of a strand of hair is protein, according to Health & Beauty Base, the right diet makes the follicle and the shaft stronger. So a lack of protein not only prompts more hairs to go into the resting stage and eventually fall out, but your body isn't easily able to generate new hairs to replace them, either.