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Nutrients classified as macro-nutrients are those that the body requires in larger amounts to provide energy and support overall bodily functions. Carbohydrates, proteins, and fats are the three primary macro-nutrients.

Carbohydrates are the body's main source of energy, providing glucose which is crucial for brain function and physical activity. They can be categorized into simple sugars and complex carbohydrates, serving various purposes in diet and health.

Proteins are essential for building and repairing tissues, making enzymes and hormones, and supporting immune function. They are made up of amino acids, some of which are essential and must be obtained through diet.

Fats, while often viewed with suspicion, are important for nutrient absorption, providing energy, and supporting cell growth. They also play a role in hormone production and the absorption of fat-soluble vitamins.

In contrast, the other choices consist of nutrients that do not fall under the macro-nutrient category. Vitamins, minerals, fiber, water, electrolytes, antioxidants, and phytochemicals are vital for health but are needed in smaller quantities or have different roles in bodily functions, categorizing them as micro-nutrients or non-nutrients.