Chris Bavin and Gloria Hunniford explore the conflicting claims and confusing messages about what people eat. In this edition, Gloria asks how much water people really need to drink every day. Chris explores if people need to pay more attention to their gut bacteria, Danny Crates investigates if blueberries, peppermint and ice cream can boost brainpower, and there is a look at whether charcoal, which is increasingly added to certain foods, is as secret weapon for all-round health or just a fleeting fad.