For sustaining energy, cassava bread, high in carbohydrates is an excellent food. It is eaten while going on long forest treks. The carbohydrates are converted to glucose which is converted to glycogen and stored in the muscles. Cassava roots can be readily available in the markets all around the seasons. Buy well formed, hard, cylindrical tuber that is heavy for its size. Cleaned, and processed yuca available in the US markets, usually imported from the Central America is generally waxed, and therefore, appears bright and shiny.