When you picture yourself in old age, you may assume you’ll be frail, have limited mobility and suffering from an illness, whether that’s dementia, heart disease or osteoporosis.

But longevity guru Dr Mark Hyman, 64, who helped popularise functional medicine (the idea that food should be the first line of therapy) and overhauled the diets of Bill and Hillary Clinton, urges people to think again.

The Telegraph London