Want to live longer? Walk more and eatt less.

Experiments have shown that a calorie-restricted diet, such as fasting on alternative days, can increase the lifespan of animals by up to 65 per cent. A Mediterranean diet lowers the incidence of age related disease.

Even as early as 2,500 years ago, Hippocrates realised that walking was good for health and recent research suggests that burning an extra 1,000 to 2,000 calories a week may be enough to reduce mortality by up to 30 per cent.