Part IV
The process of gaining or losing weight can be explained by comparing your body to your car.Both run__56__fuel,food for your body and gasoline for your car.Both__57__that fuel,first into heat,then energy,some of__58__is used to do work,and some emitted as waste.And__59__your car uses more energy when the engine is racing than when it is idling,__60__dies your body use more energy when you are working hard than__61__you are resting .
For the purpose of this comparison,__62__,there is one significant difference between them.Your car cannot store fuel by turning it into__63__else;all gasoline not__64__remains as gasoline.But your body storks__65__energy as fat.When the gas tank is__66__empty,the car won’t run;but your body can burn fat to provide more enery.
Therefore,if you want to gain weight,you must do__67__of two things:eat more calories(units of heat,therefore energy),or use less thro


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