re: Switching to vegetarian diet

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Neanderthals and early modern humans had similar dietary adaptations, obtaining most of their dietary protein from animals,

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LINK

When we evolved to humans we started eating a more plant based diet.

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Early humans, on the other hand, seemed to stick with a pretty consistent diet regardless of environmental changes: They regularly ate a relatively higher proportion of plant-based foods. Researchers figured this out by studying the tiny, microscopic dings and dents on ancient teeth.

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Cardiologist William C. Roberts hails from the famed cattle state of Texas, but he says this without hesitation: Humans aren't physiologically designed to eat meat. "I think the evidence is pretty clear. If you look at various characteristics of carnivores versus herbivores, it doesn't take a genius to see where humans line up," says Roberts, editor in chief of The American Journal of Cardiology and medical director of the Baylor Heart and Vascular Institute at Baylor University Medical Center in Dallas. © Stephen Kroninger As further evidence, Roberts cites the carnivore's short intestinal tract, which reaches about three times its body length. An herbivore's intestines are 12 times its body length, and humans are closer to herbivores, he says. Roberts rattles off other similarities between human beings and herbivores. Both get vitamin C from their diets (carnivores make it internally). Both sip water, not lap it up with their tongues. Both cool their bodies by perspiring (carnivores pant).

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You keep presenting your studies as accepted fact but there is no consensus in the scientific community on the diet of early man. To insinuate there is denotes intellectual laziness and/or a overt subversion of current science. What is agreed upon is humans are omnivores and ate both meat and plant foods and even grains.

laser ablation stable isotope analysis reveals that the delta13C values of Paranthropus robustus

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History argues in favor of the omnivore argument, considering that humans have eaten meat for 2.5 million years or more, according to fossil evidence. Indeed, when researchers examined the chemical makeup of the teeth of an early African hominid that lived in woodlands three million years ago, they expected to learn that our ancestor lived on fruits and leaves. "But the isotopic clues show that it ate a varied diet, including either grassland plants or animals that themselves fed on grasses," reported the journal Science in 1999.

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Are humans natural vegetarians? In the end, whether a person lives a vegetarian lifestyle has less to do with esoteric matters of anatomy and more to do with ethics and personal values. The architecture of the human body offers no simple answers.

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