As this is a by-product of yeast there is a good chance most of us have this. Intrestingly enough Dr's see elevated levels of arabinose in almost all autism patients. Much like Candida it is fed and reproduces on Sugar and refined carbohydrates. It also thrives on apple and apple related products. The Garden Of Life digestive enzyme has an ingredient in it specifically to eat up arabinose. You can test for it by having the OAT test, which is a urine test, by Great Plains labatories. My test was covered by insurance and only cost me $40 out of pocket. When I got the lab report back they pointed out that Arabinose causes neuroligical and emotional disturbances. So for those of us suffering from changes in our personaility, as I most certainly did, arabinose could be the answer why.