The macronutrient class that is important for structural aspects of the body (such as muscle and bone) and also helps to maintain the immune system is

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Protein is the macronutrient class that is important for structural aspects of the body, including muscle and bone. Protein also plays a crucial role in maintaining the immune system by producing antibodies and other immune system components. Carbohydrates and lipids are primarily used as a source of energy, and while fats are also important for structural aspects of the body, they do not have as direct a role in immune system function as proteins.

The Macronutrient Class That Is Important for Structural Aspects of the Body