As a consequence of a breach in the lining of gut epithelium is a series of symptoms that make up a condition known as Leaky Gut Syndrome.
From a biochemical and microbiological standpoint, bacteria that act on undigested food will end up releasing certain toxins. These toxins make the gut lining leak worse, and as repeated attacks by endotoxins released by gut bacteria keep happening, the damage only gets exacerbated.
The final result is the condition called leaky gut disease. Leaky gut syndrome can affect people of all ages and many people are not confidently diagnosed with it, yet show features that indicate the condition. A lot more research is needed into leaky gut syndrome causes.
To learn more about the condition and the known causes, read the article here: http://www.leakygutcurereview.org