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.

Michael Mosley runs an experiment to find out which foods are best for providing a crucial but neglected nutrient: iodine. Geneticist Dr Giles Yeo discovers why stress can make you put on weight. GP Dr Zoe Williams tackles the question: how safe are x-rays? Michael questions two experts on how the NHS spends our money. And psychiatrist Dr Alain Gregoire reveals how mental health first aid aims to reduce the rates of suicide and mental illness.