Just a word of warning: I run and I gain weight even eating low carb. I accept that I have to wait until rest periods to lose weight. Running should be done out of enjoyment - never for weight loss. Although I do know some people it works for, I just don't belong to that group. I may concede that it speeds up metabolism after this summer. I started running last year and gained 13 pounds. When I stopped, though, I lost 48 pounds in 14 weeks. If it happens again this year, I'll believe in the speedier metabolism theory. I'm training for a race in May and then I'll rest for two months during which time I expect to lose again.