Season 3 2018

In the first episode of the third series, Becky and Sheena from Devon have only two weeks to shape up for Sheena's hot tub party. Sheena tries the punishing Copenhagen diet, an ultra weight loss regime, while Becky tries the Special K challenge, mixing cereals and high fibre.

Xand van Tulleken, dietician Hala El-Shafie and cook Stacie Stewart oversee proceedings as three more pairs road test some of the most popular and talked about diets. AK and Bethany have two weeks to slim down for an evening of speed dating, Gemma and Charlotte want to lose weight for their school reunion in six weeks, and married couple Si and Simon aim to shed the pounds for Manchester Pride in four months' time.

This time, supermarket employee Rebecca and charity worker Alisha from London want to ditch their bikini bulges for a family holiday abroad. Gary and Connor want to look svelte for Gary's upcoming graduation, plus Elaine and Sue from Essex want to trim down for a work reunion in four months' time. Xand also investigates electro muscle stimulation for weight loss and tries to get rid of dangerous visceral fat clinging onto his organs.

This time, gym buddies Lucy and Sue want to get bikini ready for a spa day in two weeks. Best friends Fi and Sarah shape up for Sarah's birthday party. And part time actors Bharat and Atul purge the pounds for a dance routine for a Bollywood film. The diets tested this time are the carb lovers diet; the low carb diet; the wild diet; the blood sugar diet; and the highly-regarded dash diet. Xand also road tests the latest diet gadgets and finds out if our gut microbiome may hold the key to weight loss.

This time, bus driver John and children's entertainer Mark want to shed the pounds for a fancy getaway to Florida. Kanan and Parul are desperate to get slimmer for Kanan's son's wedding. And Angela and Jacinta plan to shed some pounds for a charity run. Xand also investigates why alcohol is so harmful to our waistlines and analyses how accurately fitness trackers count our calories and log our activity. The featured diets this time are Gwyneth Paltrow's Goop detox diet; the SlimFast diet; a high-fibre regime; a macrobiotic diet allegedly favoured by Madonna and Julia Roberts; some mindful eating; and the NHS weight loss plan.