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

His own actions with therapies for people suffering from serious or non-serious illnesses, within a few days and primarily 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 originate according to natural hygiene and natural therapeutic science.
• Fruit therapy for natural stimulation of the body, healing many ailments but also as a smooth reintroduction to diet after fasting.
• Alkaline diet for correction and raising the pH in the blood, as a means of prevention to avoid getting sick.
• Physical exercise for the proper functioning of muscles and the elimination of toxins from the body through burning.
• Aerotherapy through exposure to clean environments and breathing exercises.
• Sunbathing through exposure to the sun - sideways in the shade and not directly - moderately but steadily throughout the year, in order to achieve the bronzed color that indicates a healthy person, as he said, (not the unhealthy look from tanning beds, nor the excesses of the sun).