Cystic fibrosis is a serious congenital disease that damages tissues and impairs the secretory functions of exocrine glands, primarily affecting the respiratory and digestive systems. The disease is hereditary and causes changes to the pancreas, liver, sweat glands, and other organs from birth. Symptoms progressively worsen over time. Treatment requires constant medical supervision and a diet high in calories, fat-soluble vitamins, and liquids to avoid constipation. Foods rich in these nutrients include dairy, eggs, fish, meats, vegetables, fruits, nuts, seeds, cereals, and salt.