I am in the "no" category. I lost on LC and eventually at my bottom weight felt awful and got injured. I was training (not crazy mileage - about 30 miles per week - more than I'd run ever before, though). I gained back 20 pounds while training and felt better. I *want* to run without carbs but I am not sure it's right for my body, but finding a balance is hard. Mostly I just try do what I need to do not to get injured, but it usually means weight gain. It sucks.