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 the calories 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. For example, fruits and vegetables generally have fewer calories compared to processed foods like chips or candy. Understanding calorie content can help individuals make informed dietary choices to maintain a healthy lifestyle.