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Pay special attention to the serving sizes. All foods as indicated with no additional dressings, toppings, seasonings, spreads or wrappings. Averages are used in generic descriptions.
A calorie is the energy it takes to raise the temperature of 1 gram of water 1 degree Celsius. Calories are energy that fuel our bodies, much like gasoline fuels cars. The calories on most North American food packaging are actually 'kilocalories' or 'kcal' (1,000 calories = 1 kcal). For the purpose of this quiz, "calorie" means "kilocalorie." The number of calories in food is a measure of how much potential energy that food possesses. A gram of carbohydrates has 4 calories; a gram of protein has 4 calories; and a gram of fat has 9 calories. Our bodies "burn" the calories in our food through metabolic processes, by which enzymes break the carbohydrates into glucose and other sugars; the fats into glycerol and fatty acids; and the proteins into amino acids. So what happens if you take in more or fewer calories than your body burns? You either gain or lose fat, respectively. An accumulation of 3,500 extra calories is stored by your body as 1 pound of fat -- fat is the body's way of saving energy for a rainy day. If, on the other hand, you burn 3,500 more calories than you eat, whether by exercising more or eating less, your body converts 1 pound of its stored fat into energy to make up for the deficit. So calories don't make you fat. How you use those calories might. For more reading: http://science.howstuffworks.com/life/human-biology/calorie.htm