the food is fit to eat中的to eat作什么句子成分?

the food is fit to eat中的to eat作什么句子成分? the food is not fit to eat The way to keep fit is (to eat food and take morn exercise). The way to keep fit is to eat food and take more exercise.__ 英文：The way to keep fit is [to eat food and take more exercis these kinds of food ------not fit to eat The food is nice to eat.这里to eat是什么成分? Not all the food is good to eat The h__ tiger is looking for food to eat It is ?to eat the right food and stay healthy ·All of the food is good to eat. All of the food is good to eat.