Hi there - i was the opposite couldnt keep the tube feeds down so I forced myself to eat - which Is actually a plus despite the discomfort. Has he tried just drinking liquid nutrition first? I'm not sure what kind of a tube he's using, but I had a JG tube - it ran through the stomach and directly into the jejunum - if he has one of these I would try light foods first - like a sip or two of ensure over a longer period. Part of the reason they give you fluids post op is to get your motility going first off but also to ease you back into eating, maybe just give him an ensure and say 2 hours to finish it - a sip - wait - another wait. Etc. I when I was trying to take my tube feedings I would start to feel nauseated at a half a can and would stop - if I tried to continue on I would then throw up. So try easing fluids first then semi solids and then solids - maybe he just has to retrain his stomach, it doesn't have to be ensure of course it could be anything that has a mild taste banana smoothie... Etc... Is he trying to eat to relace his feeds or as extra - this may also have some bearing. Good luck...