II
we need calories or energy to do the things every day. For example, when we walk to school or ride a bike to school spend a certain amount of calories and even when we sleep, we also use them.But how many calories should we have a day to stay in shape? It difficult for us to calculate. If people want to keep fit , they should remember that everyone should have between 1600 and 2000 calories a day.
We get calories from the foot we eat.If we get to much foot and don't take past in any activities, we can get fat quickly .So besides studying , we should do some exercise, play sports or do the housework, such as cleaning the floor, cooking ect. Otherwise, we don't eat enough, we will feel tired anh weak.