This week AK and Bethany have two weeks to slim down for an evening of speed dating; Gemma and Charlotte want to trim down for their school reunion in six weeks' time; and married couple Si and Simon want to shed the pounds for Manchester Pride in four months' time. Xand also investigates whether fat-melting injections are the easiest alternative to dieting and pushes his body to the limit to find out if our overnight weight fluctuations are just down to water.
