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From the emergence of the genus homo over 2 million years age, until the agriculral revolution of roughly 10. 000 years age our ancestors were hunter-gatherers,so the adaptive pressures inherent in that environmental niche have exerted defining influence on human genetic make up. The portion of our genome that determines basic anatomy and physiology has remained relatively unchanged over the past 40. 000 years. Consequently, the complex interrelationship between energy intake, energy expenditure and specific physical activity requirements for current humans remains very similar to that orginally selected for stone age men and women who lived by gathering and hunting.