between 50 and 70 per cent of your maximum heart rate. When you exercise at this low intensity, your body draws energy from fat. As your heart rate goes up, more energy comes from carbs. So it seems logical that to lose fat you should keep your heart
. But that doesn’t mean staying slim is a battle you can’t win. It’s possible to outsmart your genes and maintain a healthy weight.Case in point: a 2009 Finnish study published in the International Journal of Obesity tracked 16 same-sex twin pairs (chosen because
