Michael Mosley runs an experiment to find out whether simply thinking about food can help you lose weight. Alain Gregoire tests whether listening to music improves your sleep, and Guddi Singh investigates the latest diet in the headlines, which claims to save the planet as well as your waistline. Giles Yeo finds out how to keep your skin young and healthy. And Zoe Williams looks into an illness that is often misdiagnosed - endometriosis.