Starving Away Pounds: Science Behind New Fast Diet

Latest diet craze in Britain urges fasting for two days and feasting for five.
2:21 | 03/03/13

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Transcript for Starving Away Pounds: Science Behind New Fast Diet
That -- dive called the fast -- appropriately named given its race to the top of the best sellers list it's all the rage in Britain tonight and there's real science behind it. Watch what you -- two days a week and eat what you want the rest too good to be true ABC's -- to indicate to this evening with the doctor behind it all. He seems much of England is obsessed with -- It may be the next British invasion and I'm sure yeah. -- playing discovered the fountain of youth. Well -- something and something went really really well for me he discovered that you can get radically healthier by doing something that sounds truly unhealthy. -- just two days a week. The other five days you can eat whatever you want things happening back home -- on -- Laughlin lost 36 pounds over seven months. -- -- -- -- -- -- -- -- -- -- -- -- -- -- I sometimes find it quite challenging. On the -- fasting days you're not actually starving but clothes. It's just 25% of -- normal adults daily intake a measly 500 calories for women roughly 600 for a man I think is. -- can report from within a doctor by training Michael mostly BBC documentary airing on PBS. Eat fast and live longer begins with a wake up call from his doctor. We've -- that mine popping glucose level. I would that a diabetic researchers across the US have been finding astonishing results from severe calorie restriction. Decreased cancer risk increase life expectancy. Even improved brain function it. -- speculative done in wrecked by mimicking feast or famine conditions researchers at Johns Hopkins USC. Discovered the body and brain responded fascinating way -- and. When admitted privately that brings us produce a protein it makes you feel -- And would also appears to do -- make you -- That doctor -- is visceral body fat and cholesterol dropped and his blood glucose what went from diabetic to normal. But -- experts say the diet is not safe for people under twenty or pregnant women or anyone who has a history of eating disorders but aside from that group -- -- or entry. Everyone I talked to is intrigued including the critic I talked to admitted that he found it fast and on the two days you don't have to starve yourself you just need a lot less bright 500 calories from Africa -- -- today we have.

This transcript has been automatically generated and may not be 100% accurate.

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