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 the 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 correction of bowel function, from where most diseases originate according to natural hygiene and natural therapeutic science.
• Fruit therapy for natural stimulation of the body, treating many ailments and also as a smooth re-entry into the diet after fasting.
• Alkaline diet for correction and increase of pH in the blood, as a preventive measure to avoid illness.
• Physical exercise for the proper functioning of the muscles and the elimination of toxins from the body through burning.
• Aerotherapy through exposure to a clean environment and breathing exercises.
• Sunbathing through exposure to the sun - sideways in the shade and not directly - in moderation but consistently throughout the year, in order to achieve the bronze color that is indicative of a healthy person as he used to say, (not the sickly look of the tanning salon, nor excessive sun exposure).