Recent Canadian data demonstrate that nearly one-half of Ontario teenagers (12 to 18 years) attending public school feel unhappy about their weight (2). Even among preadolescents, a significant number of children have a desire to be thinner (3–5). It is not surprising, therefore, that strategies aimed at changing one’s weight and shape are also extremely prevalent. Canadian cross-sectional data suggest that more than one in five teenage girls are ‘on a diet’ at any given time