by Julie Knapp

Whether you dye your hair to follow trends, to cover pesky grays or to test for truth in the saying “blondes have more fun,” hair color can have a big impact on how you look and feel about yourself. So it’s not surprising that a 2005 P&G survey found that 65 percent of women aged 15-75 had colored their hair in the past 12 months. But studies show that hair dye isn’t having such a positive effect on your health or that of the environment.