The best studies done on meat eating were on the average height of the Japanese population, before and after WWII. Before the war, the diet consisted largely of rice, vegetables and fish with low levels of fat. Post - war and red meat, milk and milk products are much more available and fashionable. The difference in height between the generations is staggering - something like one foot (I'll try and find a link to the study). This has been associated just with increased nutrition found in dairy and meat.
I think the Eskimo diet also reflects the fact that red meat can be eaten in large quantities safely. They have been living on seals, whales, fish with virtually no greens or grains for thousands of years.
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