Which nutrient serves as the major source of energy for animals?

Carbohydrates serve as the major source of energy for animals due to their structure and metabolic pathways. When consumed, carbohydrates break down into simpler sugars, primarily glucose, which is readily utilized by animal cells for energy. This process occurs through cellular respiration, where glucose is transformed into ATP (adenosine triphosphate), the energy currency of the cell.

Carbohydrates are more efficient for energy production compared to proteins and fats because they can be metabolized quickly by the body. While proteins can also be used for energy, their primary role is in building and repairing tissues. Vitamins and minerals play critical roles in metabolic processes and supporting bodily functions but do not serve as direct sources of energy like carbohydrates do. Their contributions are more around regulation and support rather than energy provision. Thus, carbohydrates are essential for meeting the energy needs of animals, supporting various activities from growth to reproduction.