Michael Mosley runs an experiment to test whether beetroot and leafy greens can give your body and brain a boost. GP Dr Zoe Williams investigates the new generation flu vaccine and gives advice on which health apps for your phone can be trusted. Surgeon Gabriel Weston discovers a new treatment that promises to improve the mobility of stroke survivors. And psychiatrist Dr Alain Gregoire reveals how to spot generalised anxiety disorder and what you can do about it. Show less