Hello, Thanks for Writing to Health Care Magic and putting trust in us regarding your Health related query. I am Dr. Saleha and I have read your message in detail, I understand your concern and will try to help you in this. I am sorry to know what happened to him but i am glad that he is back home and doing fine. It is natural to get weight loss and loss of appetite after such a major surgery . There are both physical and psychological factors responsible for this.But now as he is as home , weight loss , appetite loss can be overcome gradually. Process will be slow and care will be needed but this problem can be reversed. You will need to stay in contact with his doctor in this process and things are expected to get better gradually. here are a few things which need to be done. A) Get recommendations by his doctor on what he can eat and what group of foods he should avoid. B) Make a list of allowed food groups and items, sit with him and ask him what he feels like eating regularly. Make a list of recipes and items which you would regularly offer him in his meals, they should be full of nutrition plus if he himself likes to eat them his appetite for them will get better. C) Add come substitutes / supplements with his foods like calcium pills and a comprehensive multi-vitamin. D) Foods should have building ingredients like enough carbs and proteins this will make his body stronger. E) He should gradually increase his physical activity this will also improve appetite cycle and body will ask for food. F) Get his regular weight done once a week to see the changes in weight. The process will be gradual but with time he will feel improvement . I hope this answers your question.If you have more questions, I am happy to answer. Wish you lasting health. Regards. Dr.Saleha Saeed.