Leading Geneticist: Human Intelligence Is Slowly Declining

Mike Barrett, Natural Society, February 20, 2013

Would you be surprised to hear that the human race is slowly becoming dumber, and dumber? Despite our advancements over the last tens or even hundreds of years, some ‘experts’ believe that humans are losing cognitive capabilities and becoming more emotionally unstable. One Stanford University researcher and geneticist, Dr. Gerald Crabtree, believes that our intellectual decline as a race has much to do with adverse genetic mutations. But human intelligence is suffering for other reasons as well.

According to Crabtree, our cognitive and emotional capabilities are fueled and determined by the combined effort of thousands of genes. If a mutation occurred in any of these genes, which is quite likely, then intelligence or emotional stability can be negatively impacted.

“I would wager that if an average citizen from Athens of 1000 BC were to appear suddenly among us, he or she would be among the brightest and most intellectually alive of our colleagues and companions, with a good memory, a broad range of ideas, and a clear-sighted view of important issues. Furthermore, I would guess that he or she would be among the most emotionally stable of our friends and colleagues,” the geneticist began his article in the scientific journal Trends in Genetics.

Further, the geneticist explains that people with specific adverse genetic mutations are more likely than ever to survive and live amongst the ‘strong.’ Darwin’s theory of ‘survival of the fittest’ is less applicable in today’s society, therefore those with better genes will not necessarily dominate in society as they would have in the past.

While this hypothesis does have some merit: are genes really the primary reason for the overall cognitive decline of the human race? {snip}


Researchers from Harvard have found that a substance rampant in the nation’s water supply, fluoride, is lowering IQ and dumbing down the population. The researchers, who had their findings published in the prominent journal Environmental Health Perspectivesa federal government medical journal stemming from the U.S National Institute of Environmental Health Sciences, concluded that “our results support the possibility of adverse effects of fluoride exposures on children’s neurodevelopment.”

“In this study we found a significant dose-response relation between fluoride level in serum and children’s IQ…This is the 24th study that has found this association”.


One study published in the Proceedings of the National Academy of Sciences found that pesticides, which are rampant among the food supply, are creating lasting changes in overall brain structure—changes that have been linked to lower intelligence levels and decreased cognitive function. {snip}


Following 14,000 children, British researchers uncovered the connection between processed foods and reduced IQ. After recording the children’s’ diets and analyzing questionnaires submitting by the parents, the researchers found that if children were consuming a processed diet at age 3, IQ decline could begin over the next five years. The study found that by age 8, the children had suffered the IQ decline. On the contrary, children who ate a nutrient-rich diet including fruit and vegetables were found to increase their IQ over the 3 year period. The foods considered nutrient-rich by the researchers were most likely conventional fruits and vegetables.

Interestingly, one particular ingredient ubiquitous in processed foods and sugary beverages across the globe -high fructose corn syrup—has been tied to reduced IQ. The UCLA researchers coming to these findings found that HFCS may be damaging the brain functions of consumers worldwide, sabotaging learning and memory. In fact, the official release goes as far to say that high-fructose corn syrup can make you ‘stupid’.


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  • PBL

    Athens in 1000 BC? Dr. Crabtree need to bone up on history. If he wanted to check IQ at that time he would have to go to Mycenae.

    Of more immediate interest is current IQ. He neglects to mention the shift in demography brought by Western technology applied to the third world–especially Africa. Africa is the continent with the highest population growth (i.e., greatest profligacy) and many of us STILL feel obliged to help. Without Western donor aid famine and disease would resume taking their usual toll of Africa and other dismal lands. This would help redress the IQ issue, and shift demographic trends somewhat in our favor.

    • Quite right, PBL. Athens wasn’t much more of a village before Solon and Pisistratus turned it into a city state in the 6th century BC, though there was a king or chieftain in 1066 who was replaced by archons in that year. Two of the earliest Greek poets, Hesiod and Homer, probably came from Aeolis and Smyrna, respectively, and both in Asia Minor. In fact, Asia Minor produced the bulk of Greek thought until Herodotus applied historiography to interpreting the past. But the average Greek was hardly likely to know much more about ideas or events than those occurring around his village or neighbourhood. He would most likely be utterly overwhelmed by the horrors of diversity if he woke into contemporary Athens, as well as the technology that even Africans have learned to use over several generations.

  • The more I think about it, the more I believe the theory I first heard advanced here among the AR commentariat that human beings are slowly getting dumber over the very long term, and used to be significantly more innately intelligent in the distant past.

    Things like fire, agriculture, the wheel, and the various “Metallic” Ages, all very ancient inventions, plus written languages, are probably really clever things to invent, especially in a world which did not previously have them.

    • So CAL Snowman

      Yeah but we have space lasers and particle beams that can shoot through the earth and hit a target on the other side. We have HAARP and invisibility cloaks. We can manipulate the fabric of space/time itself. We have invented rail guns and sent robots to MARS. We have sent satellites to the furthest reaches of our solar system and beyond.. We have submarines with Nuclear reactors on board than can fire Intercontinental ballistic missiles from anywhere on the globe. We have private corporations sending people into space and delivering materials to the International Space Station. Without the yoke of Global communism we would be doing the “Total Recall” thing on Mars. I think that certain, small populations of humanity are increasing their intelligence almost exponentially, while the rest of humanity withers away into a “brown stew” of inadequacy.

      • Of course those are all astounding and awe-inspiring things. But much of that is based on a seminal base of fundamental inventions made in the 1870-1900 time period. What I think this article is about is how smart and innately intelligent more ancient humans on average had to be to make the seminal inventions, (again, wheel, metallic ages, written language, agriculture and some others) that took us from hunter-gatherer to what we would call pre-industrial. Imagine how much farther along we would be if we held our innate intelligence that high through all of human history. The very intelligence that our very ancient ancestors used to make these insightful inventions meant that we were inevitably going to suffer sort of a “lower IQ creep” — In that people who had lower innate intelligences who would have died and not passed on their lower IQ genes back when we were cold weather hunter-gatherers could survive and procreate. Now that our success in terms of technology is turbocharged, as you described, we’re creating so much prosperity that even our real dummies can make it, and we’ve actually imported dummies not of our own fundamental race who can thrive in our environment.

        • brengunn

          With the benefit of hindsight all ancient inventions seem miraculous, like they just sprung full force into life. The reality is much different. It would have taken centuries or longer for the wheel, farming and the mining of metals to be invented, through trial and error, through constant refining and evolution of the ideas. Even more so for languages, as the more things we invent, the more complex the world is, the more complex our languages become. Everything we have is based on incremental gains, in that sense, originality is a myth.

          These articles are ten a penny now, I read this very one months ago. The end of mankind etc. etc. His whole argument is nothing but supposition, with zero facts to back it up, but it plugs into the mindset people have that we are somehow regressing, so it makes good copy. Besides, the above article is confused, mentioning both genetic and environmental reasons for IQ loss.

          And lastly, were this to be true, we will no doubt break the genetic code for intelligence soon, rendering long term IQ drain meaningless.

          • Hypothetical:

            Which do you think was a “better” invention? Agriculture in a world previously inhabited by hunter-gatherer humans, or Einsteinian physics in a world previously settled on Newtonian physics?

          • brengunn

            You’re giving those statements false equivalence.

            The first statement is a change of the system and the second is change within a system.

            A truer question would be: Which do you think was a “better” invention? Agriculture in a world previously inhabited by hunter-gatherer humans or Science in a world previously occupied with theism and superstition.

            The truth is, I can’t choose. They are both of monumental importance.

      • IstvanIN

        A tiny percentage of white men did all those things. 10 million Congolese could never accomplish any of that, assuming that they could even find their way out of the Congo and to the coast by themselves.

    • Robert Binion

      Yes, ancient languages, even before the invention of writing, were incredibly complex. I,too, have long felt that modern students benefit from study of a synthetic language such as Latin.

  • The__Bobster

    The White race is sliding back into the brown primordial ooze as it slowly commits bedroom genocide.

    • David Ashton

      Come on, Engelman, where does this leave your theory of the brainy future mixed race?

      • JohnEngelman

        Any tendency toward dysgenics is temporary. Computer technology increases the relationship between intelligence and income. Aid to Families with Dependent Children, which in the United States has contributed greatly to dysgenics, is being phased out. Legal abortion encourages unmarried females with low IQs to terminate pregnancies.

        These findings run counter to the Flynn Effect. Since the school year of 1986 – 87 SAT scores for whites and Asians in the United States have risen.


        • Michael_C_Scott

          You wouldn’t marry a white woman, let alone a northeast Asian. You are disqualified from this discussion on hereditary intelligence, since you have no kids.

        • David Ashton

          The aim to reduce pregnancies among low IQ sections of the population rather than pay for their reproductive and unemployability welfare in a computer age is desirable. But there a lot of people in Africa and south Asia who are not reducing their population size and whose desecendants would presumably be in your (fortunately hypothetical) global panmixia.
          Would you like your favorite, lovable, totally splendid and “biological superior race” (the you know who’s) to mix in, or become a ruling caste over the rest of the world’s population?

          • JohnEngelman

            Internationally the birth rate is declining even among undesirable racial groups. I do not believe we should be doing anything to reduce the death rates of those people.

          • David Ashton

            And my question?

          • David Ashton

            Another question (please answer both):
            How is your Christian Zionism compatible with your racial evolution belief?

          • K8

            That’s actually the future I foresee, a small group of high IQ elites who will probably rule like feudal lords over the low IQ masses. I’m pretty sure the most of the “chosen people” are probably thinking the same thing, which is why Israel is the only “white” country in the world with anti-miscegenation laws.

          • David Ashton

            Is our “Nordic Gentile” probably thinking it too?

        • Dan Reardon

          “Aid to Families with Dependent Children, which in the United States has contributed greatly to dysgenics, is being phased out.”

          I don’t know where you come up with this statement but it is completely false. Food-stamps and various “gibsmedat” programs for welfare brood mares have dramatically increased under the Obozo administration.

    • StillModerated

      Indeed! But we allowed our womenfolk to become pink collar workers, rather than birth and civilize the next generation. We’ve hit a dead end. Enjoy paying your millionaire’s tax burden, YT!

      • kjh64

        It’s not up anyone to “allow” first of all and secondly, most pink collar workers have kids.

        • StillModerated

          News radio today was slathering over the 50th anniversary of the publication of “The Feminine Mystique.” Read it and weep, dude.

  • fakeemail

    Remember folks, “Idiocracy” was a documentary.

  • So CAL Snowman

    I’m sure it has NOTHING to do with the White race numbering in the single digits percentage wise amongst the global population. I’m also sure is has NOTHING to do with the explosion of the non White third world populations.

    • guest

      Obviously it’s much easier (and more politically correct) to place the blame on food intake than it is to point out those facts that have been deemed as “offensive and racist”.

    • You are too defeatist. The white population is not in the single digits.

  • potato78

    It’s average down of IQ, because US, Scadinavia countries imported a lot of the third world people.

  • Nathanwartooth

    These guys have their correlations messed up.

    The families who feed their kids high fructose syrup and processed food diets are poorer and being poor is correlated with having a lower IQ.

    The story isn’t about the global mean IQ. They just studied smaller samples in what looks like first world countries.

  • bigone4u

    The popularity of the Kardashians, the hip hop culture, and the wigger phenomenon are examples of a decline in respect for intelligence and evidence that there is less intelligence these days, even compared to 40 years ago. Back in the 60s there were quiz shows on TV (College Bowl is one I remember) that actually tested contestant’s knowledge of literature, science, etc. Those shows, along with informative documentaries are gone.
    There’s also the issue that America’s intelligensia are mostly far left spouters of cultural Marxist nonsense. Many really smart academics are marginalized by higher ed for being non-PC (Rushton, et. al.). Then there are our leaders who desire a dumbed down electorate, which can be accomplished through a low white birth rate and more immigration. i doubt that sugar derived from corn is the major culprit in our dumbing down.

    • Robert Binion

      The quiz shows require a quick answer. People even smarter tend to answer more slowly. Those sugary drinks are poison. As the body produces insulin, one’s hunger surges. That the producers of cheap, carbohydrate foodstuffs funded many seminal, dietary studies should trouble you.

  • a multiracial individual

    As long as K selected people keep subsidizing r selected people this trend will continue.

  • thoth-ibis

    My grandparent’s generation were taught how to raise their own food, build their own homes, weave their own cloths, and take care of their own needs. Now,,, once we lose electrical power we are helpless. Is technology dumbing us down ?

    • Morris Thecat

      your grandparents didn’t weave their own clothes, get real. People bought cloth woven in factories. Cottage weaving takes forever to get any sizable amount of cloth, and the quality of cottage made cloth would be nowhere near the quality of factory made cloth. They likely didn’t build their own home neither, not unless they were farmers and had periods of time that a full time employee would not have.You can try living that life, but it is easier and cheaper to buy mass produced items. Do you want to butcher your own cows? Do you want to make your own soaps? Do you want to live without electricity- no lights, no refrigerator, no computer? Why not buy a cyclone steam engine to generate electricity when the grid goes down?

      • A. Windaus

        My grandfather used to grow his own vegetables and hunt animals out in the national forest. Admittedly the majority of the meat we ate was bought from the butcher, but I remember wild pig, rabbit, deer, duck and geese on our dinner table that he had caught and prepared himself. I remember him bottling all sorts of fruits and vegetables in preserving jars, having lived through two world wars and the Vietnam War he was always concerned that food may become rationed and so half their double garage was full of food. My grandmother used to hand knit and crochet all of our jackets, jerseys, socks, rugs, cushions, blankets and duvets with wool and cloth. Half of their house, their deck and their garage was built by my grandfather by hand. He also laid down his own driveway and planted fruit trees in his backyard. He was career military all of his working life, he trained as an engineer and built roads and bridges during WW2.

  • Tom in MI

    These studies seem idealogically motivated. They mention corn syrup and flouride but not alcohol or tobacco.

    • Morris Thecat

      tobacco, or nicotine, increases cognitive function. Nicotine is very similar to nicotinic acid, otherwise known as Niacin, or vitamin B3.

      • Tom in MI

        Yes, but I was thinking of lung cancer, prostate cancer, emphysema, etc.

  • Morris Thecat

    I’m rather skeptical. I see them making statements but I see no data to base those statements on. How would they have any idea what an average person from ancient greece would be like today, where is THAT data. Are we to assume that all ancient greeks were as intelligent as the ones who’s writings have survived the millennia? Sheer speculation. As for the fluoride and the processed foods, that’s a bit more credible, but that isn’t genetics.

    • Bantu_Education

      There is some evidence that the genius of the Ancient Greeks stemmed from mind-expanding “magic” mushrooms. My brother-in-law spent several years on a Greek island doing botanical research on olive trees and thinks he may have discovered the source of their secret.

      • David Ashton

        More likely drugs as a factor in religion and ecstatic entertainment than in science, geometry or philosophy in the ancient world.

  • IKantunderstand

    Seriously, the bottom line is this: White people are smarter than everybody. Period. End of quote. OOh, the Chinese invented gun powder. Yeah, so what? Did they make anything out of it? NO. The Arabs discovered “0”. Did they in fact do anything with this discovery? Absolutely not. But , oh, non White people are stupid because they drink beverages with high fructose. Yeah. Right. It couldn’t ever be because they are genetically inferior?

    • Morris Thecat

      I would stay away from the high Fructose corn syrups, they are bad for youi. Read the book “The Fat Switch”

  • LHathaway

    “human beings are slowly getting dumber over the very long term”

    There are very many more humans now. If you believe in the bell curve idea of human intelligence, even if the overall IQ is dropping there could still be even more geniuses and super geniuses today. It would be a good idea if we were getting smarter.

  • a multiracial individual

    For many centuries, dullness was slowly selected out of the human population. One of the more unfortunate features of a modern society (and there are not many) is that we pretect people like this from their own decision making. Consider a law like the one that requires that we wear our seat belts. Ordinarily, most reasonably intelligent people would wear one simply because they do not want to be thrown from their car. The ones who did not share this concern would suffer from significantly higher rates of automobile deaths (as would their children). In our current situation, we now have a group of dull people who might have a limited grasp of physics, but can understand that a ticket for $100 is going to hurt. We have essentially helped these people (and their children) survive a situation in which they might not have without the law helping them out. It is understandable, no one wants children flying from cars.

    • Michael_C_Scott

      I heard in college from people I considered morons that they wanted to be “thrown clear of the accident” instead of wearing a seatbelt.

      I saw yesterday how clear that might be: an 18 wheeler was going 75 in a 45 zone on Woodmen Boulevard, between Academy and Union and he ran through a red light. I locked up all four and skidded 45 degrees, and when my wife asked me what I was doing, I said “I’m saving our damned lives”.

      And then she saw it.

      I would like to shoot that truck driver.

  • June

    Last week I was looking through a set of books (My Book House) that my mother had as a young child. She learned to read using them when she was 5 or 6 years old in the 1920s. It was quite touching to see the notations and little sketches she made in them. I could tell her age at the time since she had written dates in several places. She used these books so much that they are literally falling to pieces.

    I showed these books to a retired high school teacher (English and French). Her immediate reaction was astonishment. She said that most junior and senior high schools students of today would be barely able to read these stories and with little or no comprehension. She is convinced that IQs are dropping but even worse that the upcoming generation and their spawn will destroy Western Civilization.

    • June

      As a followup, check out this article about the author of My Book House. These books began being published in about 1920, and were reprinted for decades. Sadly later editions fell victim to the PC nazis. My mother’s edition has the “Little Black Sambo” story.

    • Runciman

      I have examined my father’s high school literature, Latin and French, and science assignments from the 1930s. I am absolutely convinced that 90% of today’s American college students could not produce this level of work at graduation. My father grew up in a small town in the Deep South, by the way, not in New York City or any other major city, and went to High School while he worked on the weekends and every afternoon (this was the Depression). I don’t know if it is the schools or average IQs but it is obvious that standards have declined enormously since the 1930s.

  • Screamin_Ruffed_Grouse


    • SmithandSmith


  • Luca

    The Liberal elite want a dumbed-down society. Ignorant masses are much easier to control. The Russian Revolution of 1917 relied heavily on masses of ignorant peasants who were easily sold a bill of goods about how wonderful communism was for the working poor. They want to topple our society which historically has been run by White, heterosexual, Christian males.

    Today, academia feeds our kids pure revisionist garbage history, fuzzy math and lies about race and society. Our kids know more about Justin Bieber and Selena Gomez than they do about George and Martha Washington.

    The media is a propaganda press and an extension of the White House pushing a Liberal Marxist agenda which we call Political Correctness. This in part preaches to us we must be tolerant of others who want to rape, murder, and pillage our lives, liberty and success.

    Hollywood is run by tribal elites who want to divide us, distract us, ruin our culture and laugh all the way to the bank which their cousins own. They have helped create a society that is more interested in screaming housewives, mixed race children, gay designers, black heroes, alligator wrestlers and cat fights than the State of the Union.

    Politicians will pander to any group they think may vote for them and no longer represent the people. They are stripping us of our Constitutional rights, robbing us and forcing us to hire, rent to and live with dangerous dysfunctional maniacs. And We the People do nothing significant about it.

    I would say the dumbing-down of America has been a smashing success for those who are engineering it.

  • Pop-science.

  • Storm Hill

    The drop in cranial capacity is all races and world wide, and can be traced back over 15,000 years:


    The loss (so far) is a chunk of brain the size of a tennis ball. At this rate we’ll all be homo-erectus level (think Bantu or Aussie Aboriginal) in a very short time.

  • Garrett Brown

    Food intake… Haha, so stupid.

  • Guest

    I have noticed that people, on average, have gotten a lot stupider over time. At first I thought I was becoming smarter but then I realized I was only becoming more educated… that the people in the society around me (with some exception) really were becoming stupider.

  • Extropico

    This is a really minor study as to the effects of too much sugar generating a lower IQ for the populace. In the long run, our IQs are likely to increase substantially due to advances in genetic research. And this will hold veracious regardless of race, and regardless of whether we engage in forced or requested race mixing and replacement. Remember that.

  • SmithandSmith

    I don’t know about the genes part but unless you’re a blind person, it’s painfully clear of just how many IQ points we’ve lost.

    As for the food and water, this doesn’t surprise me in the least. Anyone who remembers the “Made in America” days can tell the difference between the quality and taste in the food from back then and the “food” they sell us today.

    I suggest buying from your trusted local farmers and butchers.

  • cadmium

    fluoride is very good for protecting teeth so i hope that isn’t true. tea is high in fluoride, so either asians have been dumbed down for a very long time or this isn’t really happening.

    • Joseph

      It is quite debatable as to whether fluoride is even beneficial for teeth. Even if we accept the premise, ingestion is completely unnecessary and fluoride is a potent enzyme inhibitor.

      Tea has other health benefits which may mask the detrimental effects or they simply have not done the epidemiology to determine the tradeoff. The molecular character of the fluoride found in teas may also be different enough to alter the properties significantly i.e, covalent vs. ionic compounds such as used in fluoridated water supplies or found in groundwater. (?)

  • Joseph

    In other non-news for the literate, the CDC has now released the results of this year’s influenza vaccine program and found it to be a dismal failure. The primary target groups receive the least benefit from the vaccine with the over 65 y.o. efficacy at < 7% (which is probably a stretch at that). We also know that those who received several doses of the conventional vaccine are several times more likely to be diagnosed with Alzheimers disease, not to mention other related Tauopathies by retirement age.

    Now, blend all of this thoroughly in a race-mixing environment for 50 years and PRESTO! -a bunch of cognitively impaired semi-white people result.

    The result is called "cultural enrichment".

  • anarchyst

    Ideocracy wil be the norm . . .almost everyone knows (but will not publicly admit) when one pollutes their “gene pool” with lesser intelligent “genes” (black), lower intelligence of their offspring can be expected. It’s not “rocket science”.

  • America would still be brilliant if we didn’t have all these….

  • Tired

    I can’t do anything about the water supply, but as far as processed foods, pesticides, etc go we do have a choice. As white race realists, we also need to realize that excessive junk food, unsustainable agriculture, environmental decay are all in the same basket as the decline of whites.

    I suppose I was fortunate, as a child all of my siblings and I mostly drank bottled water (due to the poor sanitation of the tap water in our town).