The days of clocking off at 1pm to enjoy a long, leisurely lunch break are well and truly numbered. According to a survey by supermarket chain Sainsbury's, 43% of us eat lunch at our desks (55% in London) while another 20% go no further than the office canteen. Meanwhile, the same survey found that 78% of people choose the humble sandwich as their main meal at lunchtime.

 So, basically it's a carb-fest while checking your Facebook page to see what your ex-boyfriends got up to last night. It may be hard to pull yourself away, but you will really feel the benefit of getting up, stretching your legs and venturing far enough away from the office to find some decent food. Try and avoid carb-heavy snacks like pasta and bread; go for protein-laden salads or sushi instead if you want to keep the pounds off and stay awake during the long afternoon ahead.