Thin, in-shape people are paraded around us constantly in our daily lives through billboards and other media. The whole concept of beauty has become centered around being thin. Yet in our modern age, there are greater percentages of people throughout the world who are overweight or obese. Trends during our teenage years have a great effect on our body sizes throughout life. A new study from researchers in Norway has found that excess weight is not only caused by over-eating and lack of exercise, but it is a product of our own perception. Teens, even normal-size teens, who feel fat are more likely to grow up to be fat.