It is little appreciated how much the average diet increases our intake of biological toxins. Some foods are considered good and healthful, yet they are processed with living organisms in order to produce the sometimes - harmful food.
Many meats fall into that classification and also cheese.
Many have been told they are allergic to multiple foods. As a result they are placed on a simple single food and water. Then improvements result, but as a result of a lessened amount of undesirable substances ingested. Dr. Gardner considered such a patient to be carrying a low grade infection and treated him accordingly. At a later date, sans infection, he would retest to find a great difference.