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Think of your digestive system as a barrier between you and the outside world. There are three different ways that the digestive system and probiotics help build your immunity.
In your digestive system there is a community of flora, or naturally-occurring bacteria, that it's important to keep in balance.
Probiotics help maintain an optimal balance of the good flora in your digestive system. They also help out-compete the bad bacteria that may cause harm, and they secrete chemicals that kill off some bad bacteria. When good bacteria beat bad bacteria, it helps you stay healthier.
An intestinal mucus layer lines the digestive tract and acts as a barrier and protection to keep bad bacteria out of your body.
Probiotics help stimulate the production of the protective mucus layer and can also line the mucus layer to add an extra level of defense.
70% of your body's immune cells are found in the intestinal immune system. The intestines have an incredibly large surface area. If stretched out, the area is equal to the size of a football field! The surface area is necessary for nutrient absorption, but it presents a defensive challenge – that large area needs to be policed to keep bad things out of your body.
Immune cells in your intestinal immune system are constantly on guard, testing all the things that enter your body to decide whether they are good (let them in) or bad (keep them out). Probiotics help stimulate and exercise the immune cells by going through a sampling and screening process that acts just like a fire drill. So, probiotics help prepare your immune cells to fight off any bad bacteria that come their way!