Green Health Watch subscriber David Ryde was once recognised as the UK’s least-prescribing GP. His studies and experience had led him to advising changes in diet rather than dishing out drugs. In this article we summarise what convinced David that: humans were probably originally vegan, even fruitarian contemporary levels of meat-eating may be a factor in many diseases. Microscopic marks found on both the teeth of living species and on fossil teeth indicate that the humans of four million years ago (Australopithecus robusus) were fruitarians rather than omnivores, like present day chimpanzees Although the move from veganism to omnivore happened over millions of years, it may still have outstripped the ongoing evolution of the human digestive system, he suggests, causing many of the illnesses from which we suffer today. David's evidence David’s evidence includes: The human stomach needs half as much hydrochloric acid to digest plant protein as it needs ...