First lets take a look at a few more interesting facts. Someone with a lot of subtle food allergies will produce much more cortisol when they eat something that slightly irritates them. Now were talking subtle food allergies here, not the kind that sends someone to the hospital, often times you won't even know you have them. But what will happen is that it will inflame the person and irritate the gut. 66% of all neurotransmitters are made in the intestinal gut lining. That number jumps to 95% for serotonin. Depression and inhibited immune system are a few things associated with low serotonin levels. So someone with a leaky gut syndrome will definitely have there neurotransmitter production compromised. Someone with depression caused by lack of serotonin may in fact be suffering from leaky gut syndrome. So there is a huge price to play for unhealthy digestive tract.
I'm still learning a lot of what it takes to deal with this type of situation. One way you can go about restoring intestinal health though is through the use of probiotics. I'm currently playing with a few different brands and will let you know what I think and results I have seen. But realize there is much more going on in the digestive tract then just food digestion!