Mea and vegetables are measured in grams and kilograms . Milk and other liquid foods are measured in liters or milliliters , These units only measure quantity : they do not measure the value of the food to the body . The unit which measures the quality or value of food is the calorie, the amount of heat given off by food when it burns . This measurement tells how much energy a certain food has when it is completely used by the body .
Our bodies use varying amount of calories . The more exercise we take, the more calories we burn . If we eat food which contains more calories than we use up , then it is possible that we would increase in weight . In order to avoid becoming overweight , it is advisable to eat a balanced diet and not to eat too many foods that have a high calories rating . The table below gives you some idea of the number of calories in food .

A. Meats	B. Fruits	C. Sweets and pastries	D. Vegetable
Slice of bacon 50	Apple 70	Small chocolate bar 190	60g bean 15
Hamburger 300	Orange 60	Large chocolate bar 225	60g carrot 18
Slice of beef 100	Pear 80	Slice apple pie 300	60g potato 60
Sausage 180	Banana 80	Doughnut 200	60g onion 25
Meat pie 500	Plum 20	Scoop of ice cream 85	60g cucumber 10
Sausage roll 350	Tomato 20	Bag of potato crisps 145	60g cabbage 15

Which is the best title of this passage ?

A．How to measure the quality of food

B．Calories in foods

C．The units of measurement

D．How to keep fit

How many slices of bacon equal the same number of calories as in a sausage roll ?

A．7

B．6

C．5

D．8

To keep he calorie intake down , it is better to eat more  ________ .

A．chocolate

B．meat pie

C．fruit

D．apple pie

When do you need the most calories from your diet ?

A．When we sleep	B．In working in the fields
C．While watching a play	D．After having sports