Firstly, carbohydrates are the primary source of energy for the body and therefore play the most substantial role in fueling exercise. There are two different types of carbohydrates i.e. complex and simple. The names give an indication of the time taken to digest complex carbs that take a longer time period to digest than simple carbs.
Furthermore, complex carbohydrates provide the body with prolonged slow-release of energy and have a great nutritional benefit. While simple carbohydrates provide the body with a short-term, fast releasing energy, they contain little nutritional value.
Therefore, you should consume complex carbohydrates for example whole-grains, beans, nuts, fruits, and vegetables for maintaining a proper gym diet plan.