By Lauren Haughey If you’ve ever been tempted to throw out watery-looking yoghurt, think again – adoctor has unveiled its unexpected purpose. Many of us are guilty of chucking away food that looks a little off, but is probably fine in reality. In fact, billions of pounds are wasted in the UK for this reason, according to Business Waste, with a staggering 9.5 million tonnes of food binned every year. But one doctor suggests you can do your bit to slash this, by keeping hold of your yoghurt – even if a strange puddle of water has built up on its surface. And while it may sound gross, this couldn…