Im not going to pretend to be a know it all here. Your DAD has had a rough go last few years. He handled the transplant well? The medications for anti rejection can rough. Also, where they took “Colon” off can be rough on absorption. Does he get " nausea at the thought of eating? If hes hungry then any food that “agrees " with him is great. You can make a super calorie shake with half melted ben and jerrys, any ice cream. Protein powder made from beef protein or lactose free if the stuff doesnt “agree” the cahexic state is severe. If its getting to that point of losing him, well , I am sorry to say …I dont know how to personally handle that as i had/still have a hard time not having my mommy around. “Riding shotgun” as you say, seems like your very close. Very close. AAS with an abundance of calories even " junk” work very well. The increase in nitrogen balance is there so dont worry about protein, especially with kidney. If the point is to make him more cognitive and add some quality then go with the AAS and dense KCal. I would use some test but more of the anaabolics/ PRIMO. Make sure everything is good like magnesium, potassium, sodium all the electrolytes, and if he is handling the by products of increasing everything that would be excellent. Tough any way you cut it…