Extreme dieting is usually a habit adopted by young women, though it does affect men as well. Caleb Followill should know -- the Kings of Leon lead singer struggled with body image issues for years, and it kept him from eating properly.

According to Female First, extreme insecurity lead to years of vigorous dieting and fitness. "I always thought I wasn't good enough. I'd do anything to keep my hands and mouth busy without eating," says the singer, 26, adding that he would do hundreds of push-ups, run in hot weather and drink coffee all day to suppress his appetite.

These days? He's re-affirming his love for food and practicing healthy fitness habits. Thank goodness.