Our internal defense system – the immune system does an incredible job of defending the body from foreign invaders. People with a compromised immunity can become vulnerable to different infections, especially cold and flu, as well as cancers. In addition to consuming a healthy diet, we can implement several other strategies to boost our body’s defense mechanisms. Of these, using probiotics is a well-recognized immunity-enhancing approach. Approximately 70%-80% of our immune system resides within the gut, with the gut-associated lymphoid tissue (GALT) representing the largest proportion. Since probiotics confer a healthy digestive system, they also ensure the proper functioning of the immune system occupying our gut.
How Probiotics Enhance the Immune System and Ward off the Pathogens?
1. Improve the Health of the Beneficial Gut Colonizers
Our gut flora and the defense system are in a reciprocal relationship with one another. What happens to one will influence the other. Probiotics restore the good bacteria, and hence, they automatically restore your immune function. 
2. Fortify the Host-Gut Barriers
Our intestinal epithelial cells form a barrier against the invading microbes. Because probiotics strengthen these gut barriers, they prevent the disease-causing agents from entering into our system. The probiotic-dependent modulation of immunoglobulin A (IgA) responses accounts for the majority of their gut barrier-strengthening properties . IgA is an antibody that is present in abundant amounts in the mucosal linings, including the gut. This antibody serves as the first line of defense against the invasion of the bacteria and viruses into the intestinal membranes.
Moreover, the probiotics minimize the leakage from the intestinal membranes. Intact intestinal membranes deflect the entry of the microbes. The reduced microbial intrusion contributes to a healthy immune system.
Among different probiotics, the Lactobacillus strains are particularly shown to bolster the immune function.  (more…)