Documentary exploring the potential pitfalls of trying to lead a more healthy lifestyle, from the dangers of crash dieting to the unexpected side effects of doing too much exercise. The programme features contributions from nutritionists, dieticians, GPs, cardiologists, fitness trainers and psychologists, who explain the health benefits of fat and carbohydrates, the addictive quality of sugar, the hazards of diet pills, and what can happen to someone who eats too many bananas.