Dr. Ilias Petrou, a Greek physician and physiotherapist, arrived in 1935 from America where he studied, and through a series of books he wrote and corresponding lectures, he managed to change Greek society in just a few years.

His own actions involving the treatment of people suffering from serious or mild illnesses, within a few days and mainly 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 intestinal function, from where most diseases originate according to natural hygiene and natural healing science.
• Fruit therapy to naturally boost the body, healing many ailments and also serving as a smooth reintroduction to diet after fasting.
• Alkaline diet to correct and raise the pH in the blood, as a preventive measure to avoid illness.
• Physical exercise for the proper functioning of muscles and the elimination of toxins from the body through burning.
• Air therapy through our exposure to clean environments and respiratory exercises.
• Sunbathing through exposure to the sun—sideways in the shade and not directly—moderately but steadily throughout the year, to achieve a bronze color that indicates a healthy person, as he stated (not the unhealthy look from tanning beds or excessive sun exposure).