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 very actions with the treatments of people suffering from serious or non-serious diseases, within a few days and mainly through natural means, made Greeks believe in him and speak of 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 therapeutic science.
• Fruit therapy for the natural stimulation of the body, healing many ailments, as well as a smooth re-introduction to the diet after fasting.
• Alkaline diet for correction and elevation of pH in the blood, 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 burns.
• Aerotherapy through our exposure to clean environments and breathing exercises.
• Sunbathing through our exposure to the sun—indirectly in the shade and not directly on the skin—with moderation but steadily throughout the year, so that we acquire the bronze color which is indicative of a healthy person as he said, (not the unhealthy tan from tanning beds, nor the excesses of the sun).