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Why isnt he able to eat. Is there any nausea
, gastric upset, or a problem in his teeth....?
If he is unable to take solid (for any reason), you may give him liquid or semisolid like milk, khichdi, dalia, juices etc at frequenty intervals.
For critially ill patients who are unable to take food, a tube can be inserted through the food pipe right into the stomach, I hope he doesnt NEED that.