A friend of ours is staying with us after finishing 6 weeks of radiation therapy for tongue cancer. He's having a terrible time keeping food down. He does have a gravity feeding tube, but can only manage to take in about one can of the food a day. He gets really bad cramps and gas. Today he tried injecting the food into his stomach with a syringe the way he takes medications. Any suggestions for helping him get more food in his system? I'm worried about caloric intake and hydration.

He also coughs up a great deal of mucus.

Thanks for any help.