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The name calorie is used for two units of energy.
● The small calorie or gram calorie (symbol: cal) is the approximate amount of energy needed to raise the temperature of one gram of water by one degree Celsius at a pressure of one atmosphere.
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Calories do count.

Regardless of the debate, keeping track of the calories in is really important. If you don’t know where your calories are coming from, you can’t adjust your intake.

2.­ Fat, sugar, carb, nutritional info is just as important.

Knowing how the nutritional content of your food is broken down is really important. Your full day of calories should not be all fat, or sugar, or without a balance of nutrients. We will talk later on label reading for nutritional info.

3.­ Portion size is key.

Just because there are portion sizes on packages doesn’t mean that is what we actually consume. Make sure that your portions are actually the size you think they are. Use a scale, measure cup or measure spoons.
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The large calorie, kilogram calorie, dietary calorie, nutritionist’s calorie, nutritional calorie, Calorie (capital C) or food calorie (symbol: Cal) is approximately the amount of energy needed to raise the temperature of one kilogram of water by one degree Celsius. The large calorie is thus equal to 1000 small calories or one kilocalorie (symbol: kcal).
Although these units are part of the metric system, they have been superseded in the International System of Units by the joule. One small calorie is approximately 4.2 joules (so one large calorie is about 4.2 kilojoules). The factor used to convert calories to joules at a given temperature is numerically equivalent to the specific heat capacity of water expressed in joules per kelvin per gram or per kilogram. The precise conversion factor depends on the definition adopted.
In spite of its non­-official status, the large calorie is still widely used as a unit of food energy. The small calorie is also often used for measurements in chemistry, although the amounts involved are typically recorded in kilocalories.
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