What is a Calorie?

The video explains the concept of calories as units of energy in food, highlighting their importance for bodily functions. It discusses how calories are measured, the concept of empty calories, and the chemical processes that release energy from food. The video emphasizes the need for a balanced diet that considers both calorific and nutritional values.

Describe the process of how our bodies use the energy stored in food.

What is the key to maintaining a healthy diet according to the text?