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Women frequently compare their bodies to others and researchers have found that exposure to idealised body images significantly lowers women's satisfaction with their own attractiveness. One study found that women shown slides of thin models had lower self-evaluations than people who had seen slides of average and oversized models, and girls reported in a Body Image Survey that very thin models made them feel insecure about their own physical appearance. In a sample of Stanford students, 68% felt worse about their own appearance after looking through women's magazines. Many health professionals are also concerned by the prevalence of distorted body image among women, which may be fostered by their constant self-comparison to extremely thin figures promoted in the media. 75% of women of a normal weight think they are overweight and 90% of women overestimate their body size.