Season 5 - Episode Guide

Doctors Xand van Tulleken and Helen Lawal oversee proceedings as more people attempt some of the most popular and talked about diets on the market today, while cook Stacie Stewart gives advice about recipes. In the opening edition, Laura and Gellner have two weeks to slim down for a spa day, sisters Aishia and Karlette go on six-week diets for their joint birthday party, and truckers Adain and Gerry hope to lose weight for a hot-tub party in four months' time.

Xand van Tulleken and Helen Lawal oversee proceedings as three more pairs road test some of the most popular and talked about diets. Drag queens Jordan and Thomas have one week to drop a dress size ahead of their next performance, best friends Earl and Vince go on six-week faith-based diets to slim down before a forthcoming church celebration, and mums Maria and Jules want to lose weight for a kayaking trip in three months. Xand also investigates whether infrared can make people lighter and if it is possible to offset snacks by exercising at work.

Xand van Tulleken and Helen Lawal oversee proceedings as three more pairs road test some of the most popular and talked about diets. Newlyweds Steven and Eamonn have eight days to trim down ahead of their holiday, friends Valetta and Paulette go on six-week diets to slim before their friend's wedding in the sun, and drinking buddies Sian and Keighlee want to lose weight for a girls' holiday in four months' time. Xand investigates whether people's hormones can make them fat, and Helen examines whether knitting can lead to weight loss.

Xand van Tulleken and Helen Lawal oversee proceedings as three more pairs road test some of the most popular and talked about diets. Teaching assistants Sheila and Syrika have a week to trim down ahead of their end-of-term party, partners Greg and Nath go on six-week diets to slim down before Lincoln Pride and Becci and Cassie want to lose weight for a friend's wedding in three months. Xand asks if fizzy water can really make people gain weight and also goes on a keto diet.

Dr Xand van Tulleken and Dr Helen Lawal challenge three pairs of friends to try out the latest popular diets, while cook Stacie Stewart demonstrates some healthy recipes. Sophie and Zoe give the Citrus Diet and the Sexy Pineapple Diet a road test, Barbara and Denise spend six weeks on the Summer Salad Diet and the Summer Sandwich Diet ahead of their holiday in Ibiza, and Theo and Ervis take on the Greek Island Longevity Diet and the South American Diet so they can lose weight in time for a pool party.