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Meat and vegetables are measured in grams and kilograms. Milk and other liquid foods are measured in litres and millilitres. These (51) only measure quantity; they do not measure the value of food to the body. The unit (52) measures the quality or value of food is the "calorie". A calorie is the (53) of heat given off by food when it bums. The measurement tells how much energy a (54) food has when it is (55) used by the body.
Our bodies use varying amounts of calories. The more (56) we take, the more calories we burn. (57) we eat food which contains more calories (58) we use up, then it is possible that we would increase in (59) . In order to avoid becoming overweight it is (60) to eat a balanced diet and not eat too many foods that have a high calorie rating.