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.