Out of the following, which is the most abundant energy source in the human diet?

Carbohydrates are considered the most abundant energy source in the human diet. They play a critical role as they are easily broken down into glucose, which is the primary fuel for the body's cells, particularly for the brain and muscles during exercise. Foods rich in carbohydrates, such as bread, rice, pasta, fruits, and vegetables, are staples in many diets worldwide, contributing significantly to overall caloric intake.

While fats provide a dense energy source and proteins serve essential roles in building and repairing tissues, carbohydrates typically make up the largest percentage of daily caloric intake in many food patterns. Fiber, although important for digestive health, is not an energy source as it is not fully digestible by the human body. Thus, carbohydrate-rich foods are crucial for immediate energy needs, making them the predominant energy source in our diets.