Cold temps cause hair loss
Chilly weather might actually help you hold onto your hair. In one University Hospital of Zurich study, researchers followed 823 women for six years and found that they lost the most hair in the summer and the least in the winter. It might be evolutionary—just think how thick your dog’s fur gets in the winter. Still, dry scalps grow unhealthy, brittle, and breakable hair, so if your head gets itchy on cold, dry days, you might need to invest in a scalp-protecting shampoo for the season, Dr. Vreeman says.
