Feeling guilty after overindulging during the holidays but don’t know which diet is right for you?

Dr Xand van Tulleken is here to help. As this zippy, informative series returns, Xand – with dietician Hala El-Shafie and café chef Stacie Stewart – investigates crash diets and longer-term plans, with six volunteers trying them out.

Tonight’s dieters include brothers Gary and Wayne, who want to lose two stone apiece. Will ‘clean eating’ and Weight Watchers do the trick?