Final answer:
An average red apple contains about 52 calories and is mainly composed of carbohydrates with some fiber. Calories are a unit of energy that provide fuel for the body.
Step-by-step explanation:
An average red apple contains about 52 calories.
Calories are a unit of energy that provide fuel for the body. They come from the macronutrients in the food we eat, such as carbohydrates, protein, and fat.
An apple is mainly composed of carbohydrates, with around 14 grams of sugar and 3 grams of fiber. Carbohydrates provide energy for the body, and the fiber in apples can help regulate digestion and promote feelings of fullness.