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Michael Mosley finds out why fizzy drinks make people eat more, and Dr Zoe Williams investigates whether caffeine boosts your physical performance. Surgeon Gabriel Weston looks into the new artificial pancreas that could transform life for diabetics.

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 if eating carbs in the evening is bad for you, while GP Zoe Williams investigates a condition that leaves millions with painfully cold fingers, and investigates how to reduce the effects of jet lag. Psychiatrist Alain Gregoire reveals how to recognise PTSD and surgeon Gabriel Weston discovers the innovative magnetic technology helping cancer surgeons to remove tumours in the operating theatre.

Michael Mosley runs an experiment to find out which foods are best for providing a crucial nutrient, iodine. Plus, Dr Zoe Williams finds out how safe x-rays really are, and psychiatrist Dr Alain Gregoire reveals how mental health first aid aims to reduce the rates of suicide and mental illness.

Michael Mosley runs an experiment to test whether beetroot and leafy greens can give your body and brain a boost, and Dr Zoe Williams investigates the new generation flu vaccine. Elsewhere in the programme, Surgeon Gabriel Weston discovers a new treatment that promises to improve the mobility of stroke survivors.

Michael Mosley teams up with Olympic athletes to test which types of exercise give you the strongest bones. Geneticist Dr Giles Yeo investigates how to stay healthy if your body clock is out of sync with your work day. GP Dr Zoe Williams looks into which health advice on the internet you can trust. And surgeon Gabriel Weston carries out an experiment to discover if cleaning our homes with antibacterial products could be responsible for the rise in allergies and asthma.