Neanderthals Had Enlarged Liver And Kidneys From Meat-Heavy Diet

AlphaCog

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Homo sapiens, the ancestor of modern humans, shared the planet with Neanderthals, a close, heavy-set relative that dwelled almost exclusively in Ice-Age Europe, until some 40,000 years ago. Neanderthals were similar to Homo sapiens, with whom they sometimes mated -- but they were different, too. Among these many differences, Neanderthals were shorter and stockier, with wider pelvises and rib-cages than their modern human counterparts.

But what accounted for these anatomical differences? A new Tel Aviv University study finds that the Ice-Age diet -- a high-protein intake of large animals -- triggered physical changes in Neanderthals, namely a larger ribcage and a wider pelvis.

According to the research, the bell-shaped Neanderthal rib-cage or thorax had to evolve to accommodate a larger liver, the organ responsible for metabolizing great quantities of protein into energy. This heightened metabolism also required an expanded renal system (enlarged bladder and kidneys) to remove large amounts of toxic urea, possibly resulting in a wide Neanderthal pelvis.

Seeing evolution from a new angle

"The anatomical differences between the thoraxes and pelvises of Homo sapiens and Neanderthals have been well-known for many years, but now we're approaching it from a new angle -- diet," said Prof. Avi Gopher. Prof. Gopher, Prof. Ran Barkai and PhD candidate Miki Ben-Dor, all of TAU's Department of Archaeology and Ancient Near Eastern Cultures, co-authored the study, which was recently published in the American Journal of Physical Anthropology.

"During harsh Ice-Age winters, carbohydrates were scarce and fat was in limited supply. But large game, the typical prey of the Neanderthal, thrived," said Ben-Dor. "This situation triggered an evolutionary adaptation to a high-protein diet -- an enlarged liver, expanded renal system and their corresponding morphological manifestations. All of these contributed to the Neanderthal evolutionary process."

"In a 2011 paper, which dealt with the demise of Homo erectus in the Levant, we had already tapped into the notion that diet played a major role in human evolution," said Prof. Barkai. "We argued then that high fat consumption was one of the most important solutions to the predicament presented by human evolution. Humans are limited in the amount of protein they are able turn into energy -- protein provides just 30 percent of their overall diet. The solution, therefore, was to consume more fat and more carbohydrates when they were seasonally available.

"We found that, in the case of the Neanderthals, an acute shortage of carbohydrates and a limited availability of fat caused their biological adaptation to a high-protein diet."

The proof in the dietary pudding

Numerous animal experiments have already demonstrated that a high-protein diet is likely to produce enlarged livers and kidneys. "Early indigenous Arctic populations who primarily ate meat also displayed enlarged livers and the tendency to drink a lot of water, a sign of increased renal activity," said Ben-Dor.

According to the researchers, the total dependence of Neanderthals on large animals to answer their fat and protein needs may provide a clue to their eventual extinction, which took place at the same time as the beginning of the demise of giant animals or "Megafauna" in Europe some 50,000 years ago. The team is now researching this subject.

Source:
How diet shaped human evolution: The Neanderthal rib-cage and pelvis expanded to adapt to a high-protein diet in Ice-Age Europe
 
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paymanz

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Nice article , thanks

This part is interesting
Humans are limited in the amount of protein they are able turn into energy -- protein provides just 30 percent of their overall diet. The solution, therefore, was to consume more fat and more carbohydrates when they were seasonally available
 

jet9

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So Homo Sapiens evolved better than Neanderthals cause they had more carbs in their diet ?

Were these carbs from fruit or tubers ?
 

lvysaur

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Neanderthals, a close, heavy-set relative that dwelled almost exclusively in Ice-Age Europe
uhh, this part is very wrong. The vast majority of neanderthal admixture today comes from the Middle East
 

yerrag

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uhh, this part is very wrong. The vast majority of neanderthal admixture today comes from the Middle East
Why do you say that?
 

lvysaur

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Why do you say that?
Because the amount of neanderthal admixture in Asians (including Europeans) is extremely consistent, it's a flat 2% or so all around. This means that there was basically one big breeding event that predated all Eurasian populations, which logically would have happened in the Middle East.

Secondly, populations were probably higher in the Middle East anyway, since more sun energy = more life.
 

yerrag

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Because the amount of neanderthal admixture in Asians (including Europeans) is extremely consistent, it's a flat 2% or so all around. This means that there was basically one big breeding event that predated all Eurasian populations, which logically would have happened in the Middle East.

Secondly, populations were probably higher in the Middle East anyway, since more sun energy = more life.
Oh, I had thought you were saying that Middle Eastern people would have a higher genetic influence in the form of wider chests and wider hips. But what you were saying was that the breeding between homo sapiens and neanderthals occurred even before Europe was populated, and it would have occurred in the cradle of civilization, in the middle east.
 

lvysaur

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But what you were saying was that the breeding between homo sapiens and neanderthals occurred even before Europe was populated

Europe was populated at the time, by neanderthals. African humans invaded the Mideast, and bred with Mideastern neanderthals. Then they spread to the rest of Eurasia.

None of this has to do with "civilization", which happened 100k years later
 

yerrag

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Europe was populated at the time, by neanderthals. African humans invaded the Mideast, and bred with Mideastern neanderthals. Then they spread to the rest of Eurasia.

None of this has to do with "civilization", which happened 100k years later
It is still the cradle, regardless of how long it took for civilization to blossom.
 

Pet Peeve

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Ever thought that modern Europeans might be direct descendants from neanderthals, with a little bit of homo sapiens thrown in?
 

NathanK

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Pretty sure my family has been breeding large livers and kidneys from many generations of alcoholism.

Probably just as plausible hypothesis
 

lvysaur

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Ever thought that modern Europeans might be direct descendants from neanderthals, with a little bit of homo sapiens thrown in?
No, all modern Eurasians are direct descendants of Homo sapiens, with a little bit of neanderthal thrown in

Were neanderthals the predators of humans?
Yea, it makes total sense to try hunting down a tiny dude instead of a deer or something.
 
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yerrag

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No, all modern Eurasians are direct descendants of Homo sapiens, with a little bit of neanderthal thrown in


Yea, it makes total sense to try hunting down a tiny dude instead of a deer or something.
Were humans the predators of neanderthals as well?
 
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