Just before 2010 NYC Triathlon, CNN Dr Sanjay Gupta gave an interview about how he had prepared for the triathlon. In that interview the Doctor made some interesting comments on why running alone may not help someone to lose weight.
I’ve been a runner for a long time, for over 20 years. If changing your body shape or dropping some pounds is one of your goals, simply doing something like running every day and not really changing anything else about your life is probably not going to make much of a difference – it’s offset by eating a bowl of ice cream. During this training I’ve probably lost 20 pounds – with running alone I never got those results. I’m a big fan of running, but if you’re trying to change your body in a significant way, I think you need to add other sports.
Source NYDaily News