As we always say that macronutrients are important, I want you to understand it better so I briefly described each one separately so that you could know their role and importance.

Every day the human body requires many nutrients for energy, growth, structure, function, performance, and health. Most of the essential nutrients are lumped into two main categories: macronutrients and micronutrients. 

Essential Nutrient: a nutrient that the body cannot produce itself or that it cannot produce in sufficient amounts to maintain good health.

Macronutrient: a macronutrient is any nutrient that the body uses in relatively large amounts. Macronutrients include carbohydrates, protein, fat and water. Macronutrients are different from micronutrients, such as vitamins and minerals, which the body needs in smaller amounts. Macronutrients are important for providing the body with a supply of energy what body needs for growth and repair.

Micronutrients: vitamins and minerals, which the body needs in smaller amounts. 

Carbohydrates are the macronutrients primarily used to provide the body with energy. Proper energy substrate intake is important to balance energy expenditure and maintain desired body composition and performance. Your energy requirements will vary with age, activity, and foods eaten but without carbohydrates in the diet, performance and recovery may be further impaired, this is because carbohydrates are a key fuel for the brain and for the muscles during exercise. As a fuel carbohydrate have the same energy density as protein, 4 kcal per gram.