In general food is very cheap here. Lunch at MS is 35Rs or $0.6. At a really good restaurant a meal would be about 200Rs or $4.
I have not had any problem with spiciness of the food here. But even people from North of India find the southern food too spicy.
I have seen people eat a lot of food but in general people are very thin. I don't think I have seen anyone over 250lb as supposed to Seattle which I see at least 5+ a day.
I love the food here. I keep reminding myself not to eat too much but at each meal after sampling all the plates I end up being totally stuffed.