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 in just a few years.

His own actions, through the treatments of people suffering from serious or non-serious illnesses, within a few days and primarily through natural means, 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 arise according to natural hygiene and natural healing science.
• Fruit therapy for naturally stimulating the body, healing many ailments as well as serving as a smooth reintroduction to diet after fasting.
• Alkaline diet for correction and raising the pH in the blood, as a preventive measure to avoid getting sick.
• Physical exercise for the proper functioning of the muscles and the elimination of toxins from the body through burns.
• Aerotherapy through our exposure to clean environments and breathing exercises.
• Sunbathing through our exposure to the sun - sideways in the shade and not directly on the skin - moderately but steadily throughout the seasons, in order to achieve the bronze color that is indicative of a healthy person, as he said (not the unhealthy color of a tanning bed, nor the excesses of the sun).