Another explanation could be attributed to the food supply: in America, the lower standard of living you have, the more likely you consume a nutritionally poor

Another explanation could be attributed to the food supply: in America, the lower standard of living you have, the more likely you consume a nutritionally poor diet and consume water from the tap which in some areas has been shown to contain trace amounts of medications, spores, lead, fluoride, etc. In other words, medical conditioning.