Use herbs and spices during cooking instead of salt. Cut down on salty snack foods such as chips, pretzels, salted nuts or popcorn, and crackers. Avoid salted meats like lunch ham, sausage, bologna, and hot dogs. Limit other salty foods like pickles, olives, canned soups, and soy sauce. A diet high in fiber prevents constipation and may be helpful in preventing colon cancer and diverticulitis.
Fruit juices have no fiber.
Unsalted, unbuttered popcorn is a nutritious high fiber snack. Most children need no extra supplements,except fluoride. However, whether long term use is associated with any increased health risks is still an unanswered question. Since they provide no nutritional benefit, it's probably wise to limit these as much as possible.