The Olympics inspired us to pursue the physique and healthy glow of athletes. Daily training looks like hard work, but intermittent fasting has been suggested as the key to sustained weight loss and increased longevity. Dr Michael Mosley tried it.

A couple of months ago I set myself an ambitious goal: to find a way to live longer, stay younger and lose weight. I also wanted to go on enjoying the foods I normally eat and make as few changes to my lifestyle as possible. After talking to several scientific experts, I have spent the past few months trying a controversial diet that challenges conventional views about how and when we should eat. It is called intermittent fasting – reducing your food intake on alternate days.
Although most of the great religions advocate fasting (devout Muslims finish fasting for Ramadan this weekend), I have always been sceptical about the medical benefits and followed the standard advice, namely “never skip a meal and never crash-diet”.
The reasoning behind this is that people who skip meals tend to eat high-fat snacks when they get hungry, while those who crash-diet lose weight fast but what they lose is mainly water, with some fat and muscle thrown in. When crash-dieters give up, as invariably they do, they pile on the pounds, mainly as fat. It is known as yo-yo dieting and does you no good.
So before doing anything that involved fasting, I wanted to find out a lot more about what I was getting myself into.
I started at the London Marathon. At this year’s event there were more than 7,000 runners aged over 50, and seven who were over 80. The most impressive competitor, however, had to be Fauja Singh, also known as “the turbaned tornado”. At 101, he is the world’s oldest marathon-runner.




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