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

His very actions through the treatments of people suffering from serious or non-serious diseases, in just 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 intestinal function, from where most diseases arise according to natural hygiene and natural therapeutic science.
• Fruit therapy for a natural boost to the body, healing many ailments and also serving as a smooth re-entry into the diet after fasting.
• Alkaline diet for correction and elevation of the blood's pH, 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.
• Air therapy through exposure to clean environments and respiratory exercises.
• Sunbathing through exposure to the sun - laterally in the shade and not directly - in moderation but steadily throughout the year, so that we can achieve 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).