Macronutrients are the nutrients that provide the bulk of the energy (calories) your body needs to function. They include carbohydrates, fats, and proteins. Each of these plays a crucial role in your body’s metabolism, growth, and overall health:

Carbohydrates

These are the body’s main source of energy. They are broken down into glucose, which is used by your body's cells for energy. Foods rich in carbohydrates include fruits, vegetables, grains, and legumes.

Fats

They are a concentrated source of energy, providing more than double the calories per gram compared to carbohydrates and proteins. Fats are necessary for the absorption of fat-soluble vitamins (A, D, E, K) and also help protect and insulate your body. Sources include oils, butter, avocado, and fatty fishes.

Proteins

Proteins are made up of amino acids and are essential for building and repairing tissues, making hormones and enzymes, and supporting immune function. Dietary sources include meat, fish, dairy products, beans, and nuts.

Balancing these macronutrients in appropriate proportions is key to a healthy diet and aids in managing energy levels, weight, and overall health. For more detailed information, sources like the USDA's Dietary Guidelines provide extensive guidelines on how to balance these nutrients according to individual health needs and lifestyle.