Impossible. They couldnt have even if they wanted to. Their families dont have enough food.
True but if they were obese they would probably eat each other for survival
This is impossible as well. It is against the rules to eat another tribute. Katniss explains that a kid once went insane and ate another tribute. He was immediately executed by an avalanche caused by the gamemakers.
But only people who've read the book would know that. Forgive them.