Hi, i think this programme aired on Monday on BBC2 - it will be available on the i player for those in the uk. It was a very interesting programme about the effects on health, longevity and ageing - including cellular and brain health from fasting. They covered all the usual about calorie restrictors, but also then went on to look at the research into alternate day fasting (you still eat on the fast days but a lower calorie amount. They discussed protein and how a high protein diet switches the body into go go go mode whereas fasting regularly allows the body to go into repair mode (also less protein and more plant nutrients) They eventually came up with the 5/2 diet, which looks very useful. Eat normally for 5 days, then 'fast' for two (eating 500 calories for women and 600 for men on the fast day - no junk food on these days) The effects on the presenters health over 5 weeks of this diet where amazing - he lost a stone in weight and his body fat went from 30% to 19% his blood glucose levels went down dramatically (he was advised he was pre diabetic) amongstr other things. Here is a link to an article about it: http://www.bbc.co.uk/news/health-19112549 I'm thinking of giving it a go, I need to lose some weight and do something to help my stomach and giving it a brief rest every week feels like a good idea. All the best! Justy.