At different times in a man’s life his food has different effects（影响）on his body. Among children f___1___ is quickly changed to the power（力量）to run and play games. Most of a young man’s food is spent on growing t___2____; we grow upwards only d___3___ the first twenty years of our l___4___, not later. Working men get their strong bodies from their food; and if they work h___5___, they do not get fat. Office workers eat well and s___6___ down a lot, and may begin to grow fat when still quite young. Many older p___7___ try to work much and walk often. Perhaps the most difficult time is when a man r___8___ sixty years of age. His body and mind b___9___ restful, without much work or interest. That is when food changes quickly to f___10____.

　　At different times in a man's life, his food has different effects（影响）on his body. Among children, f __1__ is quickly changed to the power（力量）to run and play games. Most of a young man's food is spent on growing t__2__; we grow upwards only d__3__ the first twenty years of our l__4__, not later. Working men get their strong bodies from their food; and if they work h___5___, they do not get fat. Office workers eat well and s__6__ down a lot, and may begin to grow fat when still quite young. Many older p__7__ try to work much and walk often. Perhaps the most difficult time is when a man r___8____ sixty years of age. His body and mind b___9___ restful without much work or interest. That is when food changes quickly to f___10___.