In the heart of Birmingham, doctors Chris and Xand van Tulleken have set up a unique centre for science. But theirs is no ordinary lab because inside it is crammed with 30 pairs of identical twins! Thanks to their matching DNA, identical twins are the perfect candidates for scientific comparison. Chris and Xand use this principle in The Twinstitute to put contrasting health theories to the test. Pairs of twins are split into two groups and each challenged to carry out a task. The results, from diet tips to health tricks, reveal ways we could all make lifestyle improvements. This is New Year New You tested scientifically! First up is one of the biggest questions of them all - is there a best way to lose weight? The Twinstitute pits diet against exercise. With over 60 per cent of Brits currently either overweight or obese, losing weight is a priority for many of us, but which is the healthier way? To find out, two pairs of identical twins are going to go head to head for science. On Chris's team are Ken and Lyn, who are going to be spending a month hitting the gym for two hours every single day. The goal is that they burn 1,000 extra calories each day for a full month. Meanwhile, their identical twin siblings, Graham and Jen, have paired up with Xand. Their month-long regime is to lower their calorie intake by the very same 1,000 calories. Thanks to expert Professor Susan Jebb, Graham and Jen are given a tailor-made diet that they must follow for the full month. And this is where the unique twist of The Twinstitute comes in - thanks to their identical DNA, the only difference between twins is the regime that they are on. But after a month of two seriously demanding regimes, which twins will return to the Twinstitute having lost more weight? Will they all be able to stick to the program and will our twin doctors find a weight-loss regime that may work for all of us? Next is a story that is all about pain where Chris and Xand put their own identical twin bodies