I didn't seem to lose weight. Maybe a pound or so of bowel having been removed but the TPN and lipids kept me stable until I was able to eat a full diet (which was really only 3-4 days after surgery). It hurt a lot to eat at first but I was getting a lot of pain meds so I stuck through it. Subcu dilaudid seemed to work the best for me, then they switched me over the oral dilaudid so I could adjust my dose for discharge. The only thing I would really say is crucial is to get on those pain meds, don't be scared to take them, and get out of bed and walk as much as you possibly can without overdoing it. Walking was the best thing for me, even just around the ward, helped me feel a lot better got my bowels working (I was quite bloated and couldn't pass gas or BM unless I walked) and my appetite up a bit too. Staying in bed made me develop bed sores and didn't help at all. What I can't stress enough though is don't be affraid to take pain medication if you need it, and take it before your pain goes up. I find too many people don't want to become addicted or try to play hero by not taking them. Don't do it to yourself. Pain is one thing that'll do you in (it'll make you not want to eat, not want to live possibly, not want to anything) so take care of the pain.