
Originally Posted by
AandF6969
2000 cal/day isn't very much at all.. you might be going too low and slowing your metabolism down. What is your macronutrient breakdown like?
Also, "running" that much can be extremely catabolic. If your heart rate gets too high, especially on an empty stomach, you can start burning muscle for energy. At your age, your heart rate should be around 130-150 for 30-45 minutes for optimal fat loss. Distance does not matter, only heart rate and duration. I understand you weigh less, but I think you're probably losing muscle as well as fat... which means you'll be the same "shape", just smaller. The trick is to maintain as much muscle as possible, while just stripping fat off.
If I were you, I'd concentrate on lifting, and not so much on running. You're running your muscle away, and I think your calories are probably too low for muscle maintenance. You should probably post your diet and workout in the appropriate forums for critique.