This episode focuses on what is really the safe limit for how much alcohol you intake. Dr Rangan Chatterjee reveals what the healthiest foods are for healthy hair.

Gloria Hunniford and Chris Bavin investigate claims that oily fish may not be the wonder food it is often said to be after reports state it could even be dangerous.

Gloria Hunniford and Chris Bavin investigate which of the claims about foods said to help people live longer are true.Also, with claims that certain foods could stop dementia in its tracks, a woman whose mother had the condition explores whether changing her diet is the key to ensuring she doesn't develop it too.The effects of booze on the brain are revealed, there are surprises as the team exposes how food affects migraines, and two diets, each said to be the world's healthiest, are compared to see which is best. But will it be the Japanese or Mediterranean diet that comes out on top?