Calorie

A calorie is a unit of measurement for energy. It is commonly used to quantify the amount of energy that foods provide when consumed, as well as the energy expenditure of physical activities. In dietary contexts, calories are often expressed as kilocalories (kcal), where one kilocalorie is equivalent to 1,000 small calories (cal). For example, when people refer to a food item containing 200 calories, they are typically referring to 200 kilocalories.