填空了。翻译就用Google.cn吧。反正只是要了解意思，没必要做正式的翻译。
At different times in a man's life,his food has different effects on his body.Among children (food) is quickly changed to the power to run and play games. Most of a young man's food is spent on growing (tall).we grow upwards only (during) the first twenty years of our (lives),not later.Working men get their strong bodies from their food；and if they work (hard),they do not get fat.office workers eat well and (sit) down a lot,and may begin to grow fat when still quite young.Many older (people) try to work much and walk often.Perhaps the most difficult time is when aman (reaches) sixty years of age.His body and mind (become) restful,without much work or interest.that is when food changes quickly to (fat).