In this programme, Michael Mosley finds out why fizzy drinks make you eat more. GP Dr Zoe Williams investigates whether caffeine boosts your physical performance. Geneticist Dr Giles Yeo discovers what men can do about baldness. Surgeon Gabriel Weston looks into the new artificial pancreas that could transform life for diabetics. And Dr Alain Gregoire gives the psychiatrist's guide to obsessive compulsive disorder.

Michael Mosley runs an experiment to test the claim that coconut oil can cut cholesterol. Giles Yeo investigates how much fruit is too much. Zoe Williams investigates a sleep disorder that causes up to 40,000 road accidents a year. Michael quizzes two experts on whether genetic-testing kits are worth the money. And Alain Gregoire finds out how you can use your eyes to help cope with age-related hearing loss.

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