Many autistic individuals have tiny holes in their intestinal tract, and this is often referred to as ‘leaky gut’. Intestinal permeability, commonly called “leaky gut”, means that there are larger than normal spaces present between the cells of the gut wall. When these large spaces exist in the small intestine, it allows undigested food and other toxins to enter the blood stream. This theory suggests that autistic children have tears and holes in their intestinal walls, possibly due to damage from toxins, antibiotic sensitivity or infections (such as an overgrowth of the yeast Candida albicans). These children may lose healthy digestive bacteria and have damage to the cells that produce enzymes needed to absorb certain proteins (such as gluten) properly.

Gluten is a protein and is contained in grass foods such as wheat, barley, rye and oats. Casein is also a protein and is found in dairy products such as milk, ice cream, cheese and yogurt. In the intestinal tract, gluten and casein breakdown into peptides; and these peptides then breakdown into amino acids.

When incompletely broken down foods enter the body, the immune system mounts an attack against the “foreigner” resulting in food allergies and sensitivities. The release of antibodies triggers inflammatory reactions when the foods are eaten again. The chronic inflammation lowers IgA levels. Sufficient levels of IgA are needed to protect the intestinal tract from clostridia and yeast.

Partially digested protein molecules from gluten and casein, also known as peptides, can reach the brain via the bloodstream. Peptides have a molecular structure similar to that of your brain’s natural opioids (endorphins), so they’re drawn to the brain’s opioid receptors. This can lead to problems with behavior, speech and social skills. Just as opioid drugs such as heroin are addictive, so can foods high in gluten and casein …