Calories are a unit of measurement used to quantify the amount of energy provided by food and beverages. When we consume food, our bodies convert it into energy, which is essential for all bodily functions, including movement, growth, and maintaining body temperature. The number of calories in a food item can vary widely depending on its ingredients and preparation methods. In nutrition, there are two main types of calories: calories from carbohydrates, calories from fats, and calories from proteins. Each type of calorie provides different amounts of energy, with fats providing the most energy per gram. Understanding calorie content can help individuals manage their diets and maintain a healthy weight.