I'm dieting and losing my hair also, Why?

Doing the South Beach DietI'm dieting and losing my hair also, Why?
I work at a derm office and when people are losing their hair, well, they do send them for blood work...but they do recommend they take a multivitamin with Biotin and you want to make sure that you are getting enough iron in your diet. Stress will also cause you to lose hair too. Hope this helps.