TED-ED: What is a calorie? - Emma Bryce

The video explains what calories are and their role in the body's energy balance. It defines a calorie as the energy needed to raise the temperature of one kilogram of water by one degree Celsius. The video discusses how calories are used in the body for digestion, physical activity, and basic functions, and provides guidelines for daily caloric intake. It highlights that individual needs vary based on factors like activity level and age. The video also notes that calorie counts on labels may not reflect the actual energy obtained from food due to differences in digestion and nutritional value.

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