My father is 72 years. He is cardiac patient and he is also suffered cough problem since his birth. He does not have milk product such as milk and curd. I want to give them because he has taken medicines and his age is not recovery .only chappati and roti will not give energy. please advise me on alternate days can I give him curd and normal temperature milk shakes? Can I give him banana to eat also? He does not have due to afraid of cough. He says this food r making cough.