Maintaining physical and mental performance with a revolutionary diet that helps prevent age-related diseases. Sears explains that it is possible to reverse our 'biological' age (which is different from our 'chronological' age) by focusing on hormones and diet. It is crucial to maintain the right hormone balance in our bodies. Ageing is not just about decreasing certain hormones but how they effectively communicate to maintain equilibrium.

The Zone is a revolutionary diet plan advocating lower carbohydrate intake, reducing sugar conversion, and thereby preventing diabetic-like conditions. By consuming more protein and monounsaturated fats, we achieve optimum metabolic function, proven to prevent age-related diseases like heart disease and non-insulin dependent diabetes.

Sears explores hormone activity as we age and provides dietary plans with supplement advice for peak performance:

• Calorie restriction without hunger or deprivation
• Insulin, cortisol, serotonin, and eicosanoids
• Oestrogen and menopause
• Testosterone in aging for men and women
• DHEA and melatonin - are these supplements just hype?
• Thyroid gland's effect on metabolism

Exercise and the anti-ageing Zone lifestyle 'pyramid'