Dr. Ilias Petrou, a Greek physician and physiotherapist, came in 1935 from America where he studied, and with a series of books he wrote and corresponding lectures, he managed to change Greek society within a few years.

His own actions through the treatments of people suffering from serious or non-serious illnesses, within a few days and mainly in a natural way, made Greeks believe in him and talk about the new "revolution" of natural hygiene.

The therapeutic methods he applied were based on the following:

• Fasting for detoxification and correcting bowel function, from which most diseases arise according to natural hygiene and natural therapeutic science.
• Fruit therapy for naturally boosting the body, healing many ailments and also as a smooth reintroduction to diet after fasting.
• Alkaline diet for correcting and raising blood pH as a means of prevention so that we do not get sick.
• Physical exercise for the proper functioning of muscles and the elimination of toxins from the body through burning.
• Aerotherapy through exposure to a clean environment and respiratory exercises.
• Sunbathing through exposure to the sun - side-shaded and not directly - in moderation but steadily throughout the year, in order to acquire the bronze color indicative of a healthy person, as he said, (not the sickly tan of a tanning bed, nor the excesses of the sun).