answer:

the amount of energy in an item of food drink

is measured in calories.

when we eat and drink more calories

than we use up,our bodes store the excess as body fat . if this continues,over time we may put on weight .

we count them ,we trim them,we fret over them,

we work hard at burning them off, but we can't

see them, calories are simply a unit of energy,but they a great mystery to many ,they are not the enemy dieters often think they are we need calories from food and drinks to run our bodies the same way a car needs energy from gasoline and your