Moshe-Mordechai van Zuiden
Psychology, Medicine, Science, Politics, Oppression, Integrity, Philosophy, Jews -- For those who like their news and truths frank and sharp

No, Holocaust survivors do not have a greater chance to develop dementia

Recently everywhere in the news: Holocaust survivors have a greater chance to develop dementia. Don’t believe it. It’s not proven at all for the following reasons.


Statistics is a greatly specialized science. No regular physician can know if a statistical finding is significant until a statistician has gone over the numbers. It’s not something that can be decided on one’s feel or hunch.

That being said, statisticians are human too, prone to making mistakes. Sometimes they act like the proverbial crazy professor, who is so smart that he forgets to do a reality check. I’m not even an amateur statistician but I have some common sense. And different from many reporters, I don’t go blank on any number presented. Let’s think about it with our horse sense. If it doesn’t make sense on a simple level, we know enough!

I learned from Pathophysiology Professor Van Gool (Wilhelmina Gasthuis), that a single case history may teach more about a mechanism of illness than the largest and most expensive statistical studies. After all, statistics can only give a correlation (which could show mere coincidence), not a causation. The rooster indeed may “think” that his crowing makes the sun rise. And is it a pure coincident that that a stalk population decline was followed by falling birth rates? (It is.)

My father, physician and not a statistician, warned that statistics are like bikinis: they hide the parts you’d have liked to see most.

The value of good statistics is that it could hint to a possible correlation between cause and illness. But the real proof of the pudding lies in finding a real causative mechanism. Without that, it’s just a clue.

One of the trickiest things in statistics is that something must be more or less rare compared to other people or people in other situation. There hardly ever will be a perfect control group to compare the patients with. There are so many examples of historical monumental medical mistakes because of a flawed control group. Two examples.

Mothers who spontaneously lost their pregnancy too early and were given DES had a greater chance next times to deliver a baby old enough to survive. However, without DES, mothers who spontaneously lost their pregnancy too early also had a greater chance next times to deliver a baby old enough to survive. (The pharmaceutical company knew and sold the junk anyway – which proved besides not working very harmful – first discovered by a high incidence of a rare cancer in girls born from this.)

Men who had a heart attack between the ages of 50 and 60 were much more often workaholics than men who didn’t. Until they found, 50 years later, that being hyperactive actually improves survival when one gets in cardiac trouble. The overworking doesn’t cause danger but protects.

Another major source of statistical mistakes may come from doing research looking back instead of forward or coming in half-way something in motion already. One needs to figure out what bias has crept in before one starts measuring. Here, hindsight is not 20/20!

Dementia in Holocaust Survivors

The statistics now presented say that survivors have a 1.2 times higher chance to get dementia over a span of 10 years. (It is unclear to me why people living with dementia and who already died while dement, were excluded from these statistics and what this exclusion does with the figures.) That means a 20% higher chance. If between 100 non-exposed people (one report calls them erroneously ‘non-survivors’) 9 get dementia, between survivors, that would be 10-11. In individual cases, that is meaningless. It would be different if the numbers were 9/18.

Second of all, the survivors will have a much greater potential to get older than the control group. This is because the physically and emotionally weak have died decades ago. What’s left are mainly sturdy fighters. Now, the researchers write that they corrected for age but until I see how they did this, I doubt if that was done properly. They have likely measured rather that Holocaust survivors still alive, live longer.

Thirdly, the control group should have only consisted of Europeans. I knew a couple, he Holocaust survivor and dementing and she Moroccan and … dementing too. But no one had noted about her. Unaware racism is everywhere. Ashkenazic patients do get more medical attention. Even her own family didn’t want to know. “She’s fine.” So, most likely, in the control group, dementia was under-diagnosed. Most Israelis are of Mideastern descent. That totally kills the “significant” 20% find.

Four, there’s this tendency to look intently for trauma and trouble in Holocaust survivors. (This also is done to the elderly. Endless lists of “the ailments of old age.” They never talk about what great it is that above 60 the chance to heart attacks diminishes, allergies die out, keeping up appearance takes a nosedive, that above 90, it’s highly unlikely you still get any of the popular killer diseases, most illnesses, etc.) This, on top of the many (Jews included) who see Jews as a pitiful bunch, sufferers.

Five, as mentioned above, until a mechanism has been found by which Holocaust stress would give dementia (on contribute to developing dementia), these correlations are at best hints, not facts. But, causes for dementia are far from known. I wouldn’t hold my breath on this one.

Survivors of the Holocaust still alive probably live longer and better than those who weren’t subjected to genocide. In any case, they should not fear developing dementia more than anyone else unless there is proof of that. And then I don’t mean, shaky hints or marginally elevated risks.

About the Author
MM is a prolific and creative writer and thinker, an almost daily blog contributor to the Times of Israel, and previously, for decades, he was known to the Jerusalem Post readers as a frequent letter writer. He often makes his readers laugh, mad, or assume he's nuts—close to perfect blogging. He's proud that his analytical short comments are removed both from left-wing and right-wing news sites. * As a frontier thinker, he sees things many don't yet. He's half a prophet. Half. Let's not exaggerate. He doesn't believe that people observe and think in a vacuum. He, therefore, wanted a broad bio that readers interested can track a bit about what (lack of) backgrounds, experiences, and education contribute to his visions. * If you don't know the Dutch, get an American peek behind the scenes here: * To find less-recent posts on subject XXX among his over 1600 archived ones, go to the right-top corner of a Times of Israel page, click on the search icon and search "zuiden, XXX". One can find a second, wilder blog, to which one may subscribe, here: * Like most of his readers, he believes in being friendly, respectful, and loyal. Yet, if you think those are his absolute top priorities, you might end up disappointed. His first loyalty is to the truth. He will try to stay within the limits of democratic and Jewish law, but he won't lie to support opinions or people who don't deserve that. He admits that he sometimes exaggerates to make a point, which could have him come across as nasty, while in actuality, he's quite a lovely person to interact with. He holds - how Dutch - that a strong opinion doesn't imply intolerance of other views. * Sometimes he's misunderstood because his wide and diverse field of vision seldomly fits any specialist's box. But that's exactly what some love about him. He has written a lot about Psychology (including Sexuality and Abuse), Medicine (including physical immortality), Science (including basic statistics), Politics (Israel, the US, and the Netherlands, Activism), Oppression and Liberation (intersectionally, for young people, the elderly, non-Whites, women, workers, Jews, LGBTQIA+, foreigners and anyone else who's dehumanized or exploited), Integrity, Philosophy, Jews (Judaism, Zionism, Holocaust, and Jewish Liberation), the Climate Crisis, Ecology and Veganism, Affairs from the news, or the Torah Portion of the Week, or new insights that suddenly befell him. * His most influential teachers (chronologically) are his parents, Nico (natan) van Zuiden and Betty (beisye) Nieweg, Wim Kan, Mozart, Harvey Jackins, Marshal Rosenberg, Reb Shlomo Carlebach, and, lehavdil bein chayim lechayim, Rabbi Dr. Natan Lopes Cardozo, Rav Zev Leff, and Rav Meir Lubin. * One of his rabbis calls him Mr. Innovation [Ish haChidushim]. Yet, his originalities seem to root deeply in traditional Judaism, though they may grow in unexpected directions. In fact, he claims he's modernizing nothing. Rather, mainly basing himself on the basic Hebrew Torah text, he tries to rediscover classical Jewish thought almost lost in thousands of years of stifling Gentile domination and Jewish assimilation. (He pleads for a close reading of the Torah instead of going by rough assumptions of what it would probably mean and before fleeing to Commentaries.) This, in all aspects of life, but prominently in the areas of Free Will, Activism, Homosexuality for men, and Redemption. * He hopes that his words will inspire and inform, and disturb the comfortable and comfort the disturbed. He aims to bring a fresh perspective rather than harp on the obvious and familiar. He loves to write encyclopedic overviews. He doesn't expect his readers to agree. Rather, original minds should be disputed. In short, his main political positions are among others: anti-Trumpism, anti-elitism, anti-bigotry and supremacy, for Zionism, Intersectionality, and non-violence, anti those who abuse democratic liberties, anti the fake ME peace process, for original-Orthodoxy, pro-Science, pro-Free Will, anti-blaming-the-victim, and for down-to-earth, classical optimism, and happiness. * He is a fetal survivor of the pharmaceutical industry (, born in 1953 to parents who were Dutch-Jewish Holocaust survivors who met in the largest concentration camp in the Netherlands, Westerbork. He grew up a humble listener. It took him decades to become a speaker too. Bullies and con artists almost instantaneously envy and hate him. * He holds a BA in medicine (University of Amsterdam) – is half a doctor. He practices Re-evaluation Co-counseling since 1977, is not an official teacher anymore, and became a friendly, empowering therapist. He became a social activist, became religious, made Aliyah, and raised three wonderful kids non-violently. For a couple of years, he was active in hasbara to the Dutch-speaking public. He wrote an unpublished tome about Jewish Free Will. He's being a strict vegan since 2008. He's an Orthodox Jew but not a rabbi. He lives with his library in Jerusalem. Feel free to contact him. * His writing has been made possible by a (second-generation) Holocaust survivors' allowance from the Netherlands. It has been his dream since he was 38 to try to make a difference by teaching through writing. He had three times 9-out-of-10 for Dutch at his high school finals but is spending his days communicating in English and Hebrew - how ironic. G-d must have a fine sense of humor. In case you wonder - yes, he is a bit dyslectic. If you're a native English speaker and wonder why you should read from people whose English is only their second language, consider the advantage of having an original peek outside of your cultural bubble. * To send any personal reaction to him, scroll to the top of the blog post and click Contact Me. * His newest books you may find here:
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