My husband has lung disease and liver cirrhosis. Is there anything to help appetite?

He is "off" food and very weak. His doctor called last week and arranged for blood tests - says he has a slight thyroid deficiency - to get more tests in 3 months! I am wondering if there is anything he could take other than yet more medication. . Doctor didnt offer anything anyway. Probably given up on him. I thought sea vegetables but he would not eat anything like that even when he had a normal appetite. Maybe disguised in soup? There is so much on the internet I am confused.