I went from 220lbs to 167lbs hiking from Springer to Waynesboro and I am around 6 feet tall. When I got off the trail I had no body fat left...I was skin and bones from the waist up. But I also found that I didn't get hungry anymore...at least not in the stomach rumbling sense of being hungry. I would just get really tired. I knew it was time to eat when I started running out of energy and couldn't hike anymore...so I was stopping to eat something about every hour. Towards the end I was carrying more "real" food than when I started. It became a lot less about what the food weighed and much more about what I was craving. I was tired of starving and ramen noodles made me sick to the stomach because they were just empty calories and my body wanted more than that.