They share a pigment used in hair dyes, which can lead to problems down the line.

Zinc is a building block of the body and a deficiency in zinc can lead to stunted growth, diarrhea, impotence, hair loss, eye and skin lesions, impaired appetite, and depressed immunity.

"Writing a book can definitely be a stressor that can lead to hair loss, or alopecia" says Orr Barak, MD, a dermatologist at Main Line Dermatology in Philadelphia.