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?

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?

Neither David nor Denise from Eccles thinks they eat enough to warrant their size and are convinced their diet is a healthy one. Their passion for rich sauces and plentiful portions seem to suggest otherwise, as does David's determination to clear every last bit on his plate, despite having a gastric band.

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.

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?

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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.

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