Lovebirds Ray and Ange from Bolton are desperate to lose weight and are convinced they eat healthily. Ray's infamous 'pie butty' and belly-buster breakfasts suggest otherwise. Once they learn the shocking truth of what they're really eating, will they be able to stick to a five week eating plan, win their battle of the bulge and get their wedding back on track? Plus, the show lays some mischievous and tasty traps for the public, to prove just how easy it is for us all to succumb to secret eating.

Since married couple Emma and Paul from Warrington got together they've piled on a massive seven stone between them, yet are still under the impression they eat healthily. However, Emma's craving for carbs and Paul's passion for potatoes - 16 in one sitting - suggests otherwise. Once they learn the shocking truth of what they're really eating, will they be able to stick to a healthy eating plan?

Sisters Lauren and Stephanie from Essex are 20something siblings mystified by their weight gain. They've each put on two stone over the last two years, tipping the scales over into the overweight category. Lauren is even training for the marathon but has yet to lose a pound. The girls think they eat healthily, but Stephanie's grab-and-go habits and Lauren's social suppers suggest otherwise. Once they learn the shocking truth of what they're really eating, will they be able to stick to a healthy eating plan, nip their weight gain in the bud and lead a healthier lifestyle in the future? Plus, when it comes to eating, once we pop most of us can't stop, so in this episode the secret cameras record mischievous and tasty traps set for the public, proving just how easy it is for anyone to succumb to secret eating.

Hetal and Mitul submit to a course of diet surveillance. Is it the extra cheese sauce in their moussaka or the added chocolate spread in their health shakes that's stopping them from losing weight?

Good friends Daryl and Kat from Essex are desperate to lose weight, but think they eat healthily. Daryl's breakfast blowouts and Kate's serial snacking suggest otherwise.

Sister and brother Emma and Matthew from Camberley in Surrey are under the spotlight this time. Matthew is very sporty, mountain-biking at weekends and going to the gym three times a week, while Emma restricts her food intake on weekdays to just a few hundred calories a day. So why are these two putting on weight? They're convinced they're making the right choices with their food, but Emma's habit of picking while cooking, and Matthew's willingness to indulge in chocolate cake immediately after exercise, seem to suggest otherwise. Once they learn the shocking truth of what they're really eating, will these siblings be able to stick to a healthy eating plan, start winning their fight with the flab and look forward to a healthier future?

Sisters Precious and Florence, from Sidcup, are the latest pair to come under the show's spotlight with their eating habits held up for scrutiny. Gym bunny Precious works out every day and insists she eats healthily, while elder sister Florence cooks everything from scratch and would rather eat her own food than touch a takeaway. So why are they both putting on weight? They're convinced they're making the right choices with their food, but Florence's mega-carb portion sizes, Precious's love of a treat, and both sisters' devotion to fast food seem to suggest otherwise.