When a food label reads low-calorie, the product contains 40 calories or less per serving.
A calorie is a unit of energy. For historical reasons, two main definitions of "calorie" are widely used. A staple calorie, food calorie, or kilogram calorie was originally defined as the amount of heat required to raise the temperature of one kilogram of water by one degree Celsius. Wikipedia
The amount of energy in food and drink is expressed in calories. When we eat or drink more calories than we consume, our bodies store the excess as body fat. If this continues, it can lead to weight gain over time.
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