A healthy digestive system breaks down foods and liquids into carbohydrates, fats, and proteins so the body can absorb them as nutrients for growth and energy. It also contains much of the body’s immune system, protecting against pathogens or other toxic substances consumed in food or water. As with all complicated systems, the human digestive tract doesn’t always run smoothly.
https://blog.bioticsresearch.com/immunoglobulins-for-digestive-immune-and-sports-nutrition-support