About 90 years ago Sir Robert McCarrison was sent to India to assess the health of the Indian people.  He traveled extensively and found that the people in a small area on Northern India (now Pakistan) had exceedingly good health.  These peoples--the Hunza--have been studied extensively.  McCarrison's findings were as follows:

• The Hunza's were long lived
• They had virtually no heart disease
• They had virtually no cancer
• They had virtually no dementia
• They had no diabetes
• They had no deficiency disease
  

McCarrison was obviously intrigued by the Hunza.  He looked at the following variables to determine what gave them their excellent health:

• He found that genetically they mixed with other tribes and other peoples who had poorer health--from this he determined that the health wasn't just genetic.
• He looked at social structure and the type of terrain they lived in and found other peoples with similar social structures and terrains that did not share the Hunza's excellent health.
• He found another nearby tribe that shared the Hunza diet, but not the Hunza's composting practices, and their health was not as excellent as the Hunza's.

McCarrison finally concluded that the Hunza's excellent health was a product of both their diet and their composting practices.  He described their diet in exceedingly simple terms:  whole, unprocessed grains, plenty of fresh vegetables, a considerable quantity of which were raw, occasional meat, and plenty of raw milk and fermented dairy products.  It's that simple.  further, see what he has to say about composting and organic cultivation:

"Further, the quality of vegetable foods depends on the manner of their cultivation: on conditions of soil, manure, rainfall, irrigation. Thus, we found in India that foodstuffs grown on soil manured with farmyard manure were of higher nutritive quality than those grown on the same soil when manured with chemical manure. Rice grown in standing water--the common practice in India--was less nutritious than when grown on the same soil under conditions of natural rainfall. Spinach grown in a well-tended and manured kitchen-garden was richer in vitamin C than that grown in an ill-tended and inadequately manured one."

 Here's a link to McCarrison's original work.