The global weight-loss market is worth about £250billion, with much of its profitability hinging on calorie counts and booming sales of diet food and drinks. But when you set the runaway success of this sector against the world’s ever-rising obesity levels, it’s obvious something isn’t working.
I have been an epidemiologist for 30 years, studying how and why diseases occur in different groups of people, and for the past decade I have been leading teams at the cutting edge of