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You may want to look into the Omega-3 protocol. There are ways to adjust it for feeding tubes as well. I think The Brain Health Center still does free consults.
I would see if he can have a registered dietician assigned to his case since he is on a feeding tube and needs to gain weight. He may require a certain level or consistency to his fluids. I would definitely check with medical since they placed the tube they should have a plan on helping to wean him off of it.