it become necessary). "That's good in the short term as a defence mechanism," says neuroscientist Dr Bruce McEwen, of New York's Rockefeller University. "But chronic stress remodels the brain." Brain cells bombarded with stress shrink and become cut off from

and Griffith University in Australia. In fact, a 2009 study of over 10,000 subjects reported that between-meal nibblers were 69 per cent more likely to pack on pounds over five years.Frequent eating only works if you choose nutritious foods and are forever

. In fact, a 2009 study of over 10,000 subjects reported that between-meal nibblers were 69 per cent more likely to pack on pounds over five years.Frequent eating only works if you choose nutritious foods and are forever vigilant when it comes to controlling

appropriately, which means 150-350ml of fluid – preferably a carbohydrate drink – for every 15-20 minutes of running. To do this, take your favourite drink on the run, or stash it along your route. And sniff out all the available water along the way – and use it