Given that the PEG is a minor procedure, this surprises me, but I respect everyone's right to do what they think best. I fought the idea of a PEG, for reasons that are too stupid to admit to here. By week four and significant weight loss, not to mention the lack of proper nutrtional intake, the doctors took the decision out of my hands. By then i was behind the 8 ball as far as my body's needs, and I am not refering to weight....for all those who are advocates of the "cheescake en mass" route.
Remember as you fatten him up for the future, that weight is not a measurement of health. Feed him things that are nutritional, not just calorie dense. It's all about healing rates and the bodies ability to do so. Make no mistake this will tax its ability to do so.
Lastly, there is no reason that a homemade ice cream (or blender smoothie drink) could not be fortified with whey protein, and other nutrients. Fat isn't going to help him heal.