You have to be pretty careful. It's actually quite common for people to _gain_ weight when training for a marathon because they often end up eating more than th

You have to be pretty careful. It's actually quite common for people to _gain_ weight when training for a marathon because they often end up eating more than they burn during the runs. For me at about 185 pounds, I'll burn around 870 calories by running 10k: http://www.runnersworld.com/tools/calories-burned-calculator http://www.runnersworld.com/tools/calories-burned-calculator I could gain those calories back and more in 15 minutes just eating a burger. A lot of people do exactly this and sabotage themselves a bit. Personally if I bump up my running training and want to lose weight, I can never depend on it happening naturally. I always gain weight if I don't actively try to lose it. So I think no matter what you need to be careful. If you exercise more, you'll be able to eat more, but if you want to lose weight, you'll still need to eat less than your body wants. So I still think fundamentally losing the pounds starts in the kitchen.