Teenagers who diet are at risk of excess weight gain over time. The Canadian Paediatric Society's recommendations are as follows: For normal and overweight teenagers, encourage eating according to the Canada Food Guide (64). Discourage fad diets, fasting, skipping meals and dietary supplements to achieve weight loss.DEFINITION OF DIETING · RISK FACTORS FOR · CONSEQUENCES OF. Jun 16, - More than 1 in 3 girls who are at a healthy weight still try to diet. Why do teens go on crash dieting? Body image.