The blood type diet was invented in the late 1990s by a man called Peter d'Adamo. His main principle was that human beings have evolved over time and that our diets have adapted to suit our blood types.
What should type Os eat?
According to d'Adamo, people who have type O blood (the majority) should do an awful lot of exercise and eat plenty of red meat...
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http://health.ninemsn.com.au/dietandnutrition/azofdiets/691071/blood-type-diet
