The standard unit for measuring dietary calories is the kilocalorie (kcal), often referred to simply as "calorie." One kilocalorie represents the amount of energy required to raise the temperature of one kilogram of water by one degree Celsius. This measurement is vital in determining the energy provided by food and how it contributes to an individual’s daily energy needs. Understanding calorie content is important for managing weight, fueling physical activity, and ensuring a balanced diet to support health and fitness goals.