Favourite investigations. Matt Tebbutt visits China, the world's biggest oyster producer. Jimmy Doherty looks at dry gin. Kate Quilton asks if herbal bedtime teas can help you nod off.

A special guide to healthy eating for the New Year. Jimmy Doherty takes a trip to Thailand to discover if ginger makes people more resistant to cold and puts the belief that beer should be drunk before wine, not after, to the test. Amanda Byram learns some surprising facts about the fitness benefits of spinach and presents some dietary tips to help with working out, Matt Tebbutt discusses easy ways to get a daily dose of fruit and vegetables, and Andi Oliver learns if chocolate may actually be good for teeth.