In the United States, it was reported that among teenage girls, a gap had become a beauty ideal.[4] Many women have found it difficult to achieve a thigh gap, leading some to resort to extreme dieting[5] or surgery[6] in order to try to obtain it.[7] Critics of the craze have pointed out that the thigh gap is a physiognomic feature natural only for women with a certain type of body shape and bone structure that most women do not have. Experts say[which?] that attempts to attain the unattainable ideal result in problems of self-esteem that can lead to eating disorders.[5]