I was going to start a new topic but since this one is still on the first page I'll go ahead and post here. I'm wondering if anyone else has anymore insight on gaining weight.
I'm 33 and have been pencil thin my whole life. If it were possible I would say I have a negative percentage of body fat. I had jobs that kept me fairly active for much of my adult life but for the past year I've been fortunate to have a sitting job. And here I sit, all day long, eating junk food. But despite being very inactive and still eating lots of junk food, I don't gain a single pound.
There doesn't seem to be any quantity of food I can eat that would cause weight gain. My body's response to eating more food is to just burn it off faster. When I was a teenager my Dad made me stomach those awful weight gain shakes every night to try to beef me up. Eventually he gave up when I didn't gain a single pound. And ironically, eating more food just makes me hungrier and ultimately doesn't add any more weight. I eat more and my body burns more. I eat less and my body burns less. The net result is that I'm always the same weight no matter what I do.
I eat plenty of junk food. Ice cream, donuts, pizza, burgers, cookies, whatever. If it's bad for you then I probably eat it, and too much of it. I don't eat big meals so much but I do tend to snack all day long. I have a small stomach that won't hold much but it does empty out very quickly. I can go from "so stuffed I want to puke" to "starvation" in an hour. I had a co-worker in the past that would see me munching on junk food all day every day. She asked me what my secret was to staying so thin so I told her "donuts". For some reason she didn't like my answer.
Skipping breakfast was also mentioned. I do tend to skip breakfast and/or just eat a small snack as breakfast but not because I'm purposely trying to skip it. My stomach doesn't function within 1-2 hours of waking up in the morning so I have no choice but to eat lightly. I'd love to pack in a big breakfast of waffles, eggs, and bacon but my stomach rejects food first thing in the morning. It still growls for food, but I know that trying to feed it too early would make it very unhappy. So breakfast is skipped.
It crossed my mind that if the day came where I went down the transition road that my body would have no fat to work with. I think it's broken. It doesn't know how to make fat cells.