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Carbohydrates should form the largest part of a balanced diet because they are the primary source of energy for the body. When consumed, carbohydrates are broken down into glucose, which is utilized by the cells to perform various functions—from powering physical activity to supporting brain function. They are also important for the proper functioning of the nervous system and play a crucial role in metabolic processes.

In a balanced diet, it's essential to include a variety of carbohydrate sources, particularly those that are whole and unrefined, such as whole grains, fruits, and vegetables, which also provide essential nutrients and fiber. A diet high in carbohydrates can help maintain energy levels and support overall health, making them a fundamental component of nutrition.

While proteins, fats, and minerals have their own vital roles in the body, carbohydrates are recognized as the macronutrient that should be consumed in the largest quantity to ensure adequate energy and health.