I have not gained any weight since my spinal cord injury 2 1/2 years ago, and have probably lost even two or 3 kg! People think this is really easy for me, but I can assure you that it most definitely isn't. I have restricted myself to two meals a day, because I'm not doing as much exercise as I did previously so I don't need much food. But I have been following a low GI diet, and I make sure that my first meal of the day is the large one, and that my second meal is much smaller. Obviously, I try to avoid carbohydrates but not too much because we need them for energy. When it comes to problems with #2s the best thing is to consume about 100-200g of mixed nuts with two or three dates every second day, trust me, that little combination does wonders!
The proof of the pudding is in the eating so here is a recent photograph of myself (on the right) and a friend. Considering I had been drinking for about four hours I don't actually look my best but as you can see I have kept my weight right down.
Click to view attachmentAnyway, good luck. Once you get into a decent pattern it won't be a problem... and you will feel all the better for it :-)