Most mammals don't menstruate, so why do humans? Scientists have had some bizarre ideas over the centuries, but we seem to finally be getting somewhere. https://t.co/vT0AXVYcPZ https://t.co/SgUNrTqRIY
The evolution of endometrial cycles and menstruation.
Mentions
Extended reach
Total likes
Video views
Mentions per month
Apr 2016 – Sep 2025Where it's discussed
-
X / Twitter99 posts
-
News4 articles
-
Bluesky2 posts
-
YouTube2 videos
-
Blogs2 articles
AI synopsis
What people are saying
The discussions overwhelmingly show interest and engagement with the article, with many examples such as references to videos explaining menstruation and hypotheses like the 'Choosy Uterus'. The tone varies from curiosity to correction, highlighting a collective effort to understand the biological and evolutionary significance of menstruation, which underscores its moderate impact on public scientific literacy.
Most discussions recognize the validity of the article's hypothesis about menstruation's energy-saving function, with some emphasizing its evolutionary role.
Many comments express curiosity and enthusiasm about understanding why humans menstruate, especially since most mammals do not.
Numerous participants reference videos, scientific hypotheses like the 'Choosy Uterus', and debate how menstruation relates to human biology, showing deep engagement.
While some recognize the scientific relevance, the overall impact appears moderate, mainly contributing to increased awareness but not prompting broad societal change.
Abstract in brief
- The traditional hypothesis suggests menstruation evolved to protect the uterus from pathogens by shedding infected tissue and delivering immune cells, but this theory was not supported by the evidence.
- The author proposes an alternative explanation: the endometrial lining is shed or resorbed when implantation fails because this cyclical regression is less energy-consuming than maintaining an active endometrium.
- The cyclic changes in endometrial energy use are part of the body's overall metabolic cycle, with significant energy savings during menstruation and non-breeding periods, helping females conserve energy and maintain body mass across different environments.]
Top posts
Most liked on X and Bluesky@OnlySeverinsen @finelinetears @sarahlugor https://t.co/4w7ZjJEfpV it’s actually really interesting. Humans are one of the only species that have such inconvenient periods
@firebird2110 @zaelefty @SciShow And this episode "Why Do People Have Periods When Most Mammals Don't?" that fails to mention women or girls once in its 12 minute running time. https://t.co/bo4bVz7PAn
.@scishow drinking game rules - 1 sip every time they avoid using male/female Their latest video is on periods: F̶e̶m̶a̶l̶e̶ Humans Menstrators Half of People We/Us Half of humanity Menstrating people People Parent Host Half of us People whose uteruses https://t.co/WFkT0fwsvl
JKR struggling to define 'women' like
@russpolushko Хороший вопрос. Есть несколько гипотез. https://t.co/4lmUWHuOjt
All mentions
Why Do Humans Have Periods When Most Mammals Don't? Evolutionary Insights
Few mammals actually get periods every month or even at all but why Understanding what menstruation really is and why it happens could help ease symptoms and treat conditions that stem from the reproductive system.
Evolution of Menstruation and Female Reproductive Cycles
Periods are a necessary part of human reproduction, but most other animals don't have them. The traditional hypothesis suggests menstruation evolved to protect the uterus from pathogens, but evidence does not support…
@dr4matics Actually it's better that humans have periods it most likely served a very good evolutionary purpose https://t.co/lX5ANYzGdl
JKR struggling to define 'women' like
https://t.co/D2h3Ft0D6A 1> the more I learn about the body’s subtle, built-in intelligence, the more it exposes how primitive and surface-level our everyday idea of 'consciousness' really is. It's like human biology devours psychology-frameworks for breakfast.
Why Do People Have Periods When Most Mammals Don't? https://t.co/xefV58fDxf via @YouTube
Why Do People Have Periods When Most Mammals Don't? https://t.co/UEKBVcsWSu via @YouTube
@writemenfess btw kemarin nonton ini semoga menambah insight sendernya juga https://t.co/RjVayWtx5o
youtu.be/XXzFO1kEBfY
Why Do People Have Periods When Most Mammals Don't? If you need a break from the news, here's a great video on #menstruation. Everyone should know this stuff, especially what we've learned since "health ed" classes (mine were in the 1960s). https://t.co/DnqeA9V5Aj
Source: https://t.co/N1T1KEqt23
@AmandaMontagne @RachelUndercovr @ask_aubry these two videos do a good job explaining. https://t.co/prqMkf4JrF https://t.co/5ujBN8lot9
Wow. OP needs to educate themselves on the fact that humans are one of a very few mammals that actually bleed during menstruation while most other mammals don't, not to mention other animals don't bleed either. Geezus. https://t.co/1YqOWHc6es https://t.co/2iZJ8fQJSF
@DrMel_ @Living_JustCus https://t.co/PTqMldZkId
Why Do People Have Periods When Most Mammals Don't? https://t.co/61oPcK0yAa via @YouTube
I love this video for the fact that it accurately caused fetusus "parasites" alone. https://t.co/cjUbjTGinG
Found this dope video https://t.co/zTe7FKVBkK
Why Do People Have Periods When Most Mammals Don't? https://t.co/zCA5nkuc3c via @YouTube
@FriedrichE49 @sunnydaejones this is false. watch the first 45 seconds. https://t.co/ep4GXn0QOW
@JasssGonza @inallcreashun @sunnydaejones they don't. https://t.co/ep4GXn0QOW
@sunnydaejones dogs don't get periods. their bleeding comes from the vagina, not the uterus and it happens before ovulation. source: https://t.co/ep4GXn0QOW
"Twelve months of amenorrhea save an estimated 130 MJ, or the energy required by one woman for nearly half a month." Love papers like these. Thanks @julietmce for this little jem https://t.co/jAeH6fZ95g
@KuchaMusora Конкретно про рукокрылых не знаю литературу( Strassmann B. I. "The evolution of endometrial cycles and menstruation"; Profet M. "Menstruation as a defense against pathogens transported by sperm"; Martin R. D. "The evolution of human reproduction: a primatological perspective".
Strassmann, I. (1996). The Evolution of Endometrial Cycles and Menstruation. June 01,2023. Retrieved from https://t.co/jEPHKmR6gz
@russpolushko Хороший вопрос. Есть несколько гипотез. https://t.co/4lmUWHuOjt
Liked on YouTube: Why Do People Have Periods When Most Mammals Don't? https://t.co/4asIvLj1MI
@m_bluesoul https://t.co/9dbnMvciAF
Hmmm… you are right! In 1996 this was debunked. My sexual education class was before that. https://t.co/xx32Z5pf4E https://t.co/2Ft53LZ2fH
@OnlySeverinsen @finelinetears @sarahlugor https://t.co/4w7ZjJEfpV it’s actually really interesting. Humans are one of the only species that have such inconvenient periods
https://t.co/JQAjbQOHcl
WELL THAT'S THE BIG QUESTION, INNIT.
@RustBeltRebel 2. Periods, and theories on why humans have them https://t.co/yZCys7xcSE
https://t.co/E3omVezzrL @SciShow For the following reason, a baby is NOT a parasite: Mother and baby do NOT INTEND to harm each other. Comparison: an actual parasitic relation, one/both intends to harm the other That vid part is interesting until you call the baby a parasite.
Why Do People Have Periods When Most Mammals Don't? https://t.co/5tsC6A5kjI via @YouTube
FYI for people with menstruation power.... Why Do People Have Periods When Most Mammals Don't? https://t.co/qKWW0FGQKH
@chevrolexia https://t.co/QSo4YV5lmJ Sem zuera esse vídeo do SciShow é bom demais porque eu tinha essa mesma pergunta PS: todos os vídeos do SciShow são bons demais veja todos
RT @karimnas_: @artficialportal "There is a correlation between species that have overt menstruation and those that have a large uterus rel…
@artficialportal "There is a correlation between species that have overt menstruation and those that have a large uterus relative to the adult female body size." https://t.co/UPskiHf9uo
Why Do People Have Periods When Most Mammals Don't? https://t.co/3DffhlBb3l Ver menotóxicos.
RT @boysvswomen: .@scishow drinking game rules - 1 sip every time they avoid using male/female Their latest video is on periods: F̶e̶m̶a̶…
RT @boysvswomen: .@scishow drinking game rules - 1 sip every time they avoid using male/female Their latest video is on periods: F̶e̶m̶a̶…
Choosy Uterus Hypothesis is my favorite thing today. And to women everywhere, I'm so sorry and the species thank you. https://t.co/PPNbLgJK88
@mUHleee_ @00azula Sure, here’s the video I referred to. There are many bc methods that halt periods altogether. I’ve been on them, myself. There are no negative health consequences from NOT getting your period. https://t.co/2L4eRdsjUn
@corpsepary https://t.co/rk8j8nhSJo
RT @piekna: @firebird2110 @zaelefty @SciShow And this episode "Why Do People Have Periods When Most Mammals Don't?" that fails to mention w…
RT @piekna: @firebird2110 @zaelefty @SciShow And this episode "Why Do People Have Periods When Most Mammals Don't?" that fails to mention w…
@firebird2110 @zaelefty @SciShow And this episode "Why Do People Have Periods When Most Mammals Don't?" that fails to mention women or girls once in its 12 minute running time. https://t.co/bo4bVz7PAn
Why Do People Have Periods When Most Mammals Don't?: https://t.co/1dQk5NXEnI #biology #medicine #Menstruation #reproductivebiology
@legallyines Hiiii, I'm just gonna leave this here, it's pretty educative and NO, very few mammals actually get periods (menstruation) https://t.co/Ss5nsNNAC0
@inpenem @Mikoaj72606504 Każdego bo taka jest natura zjawiska ciąży u ssaków, nie tylko ludzi :) Jak Pani lubi to proszę bardzo, może Pani mieć biologię tam gdzie światło nie dociera. Jakby jednak interesowało Panią naukowe uzasadnienie to polecam ten film (szczególnie od 6:50): https://t.co/ZAK1MzlqBq
Why Do People Have Periods When Most Mammals Don't? https://t.co/idYXRWco4y via @YouTube
Today my kid was curious to know what other species of animal has a Menstrual flow. The SciShow on YouTube gave a great response to this issue. https://t.co/0kQjeHVOuV
RT @UBI_NOW: https://t.co/IatcC1sMt7
https://t.co/IatcC1sMt7
Why Do People Have Periods When Most Mammals Don't? https://t.co/glX6V3IdDI via @YouTube
Ohhh
@SoniaPoulton Amen to that.. Case in point - a 12 minute video about menstruation that fails to mention the word woman or girl https://t.co/kWCDKos24I
@DaalSanne https://t.co/S2SNWBMc2B
Why Do People Have Periods When Most Mammals Don't? https://t.co/S2SNWBMc2B via @YouTube
Unreal that you can produce a 12 min video about menstruation without mentioning women or girls once! Maybe you should get back to the biology books.. @SciShow @hankgreen Why Do People Have Periods When Most Mammals Don't? https://t.co/2ZFYOuMU1c via @YouTube
@animalfess2 Gak... kalo ga dibuahi biasanya penebalan dinding rahimnya akan di reabsorb sama rahim. Kalopun berdarah katanya kucingmu lagi pada masa 'heat' https://t.co/9Ae0U0BPfl
Why Do People Have Periods When Most Mammals Don't? https://t.co/a54Fqv7NIa
Why Do People Have Periods When Most Mammals Don't? https://t.co/rzA6y2pYsu via @YouTube
I thought this would put me at ease but nope, I still hate it. https://t.co/W2eDr6NJP7
https://t.co/lovmfaSSol
Why Do People Have Periods When Most Mammals Don't? https://t.co/5bx3XAv93A via @YouTube
Why Do People Have Periods When Most Mammals Don't? .. and misogyny https://t.co/EfkfQJ2oco via @YouTube
Why Do People Have Periods When Most Mammals Don't? https://t.co/nQRiGwS6go
Why Do People Have Periods When Most Mammals Don't? https://t.co/GNgjt5YYxh @YouTubeさんから
This is really interesting mostly because the process that leads to periods actually protects us from the parasites that are babies. Periods might also be flushing out fetuses that would never survive, before they take too much energy from us https://t.co/k3iutw6e0f
RT @Deus_Ex_Human: Why do humans have periods when most mammals dont? https://t.co/oarKb2MvEG via @SciShow
Why do humans have periods when most mammals dont? https://t.co/oarKb2MvEG via @SciShow
Why Do People Have Periods When Most Mammals Don't? https://t.co/O16vaz9g78 via @YouTube
@KelarRiss Yeah, Aunt Flo isn't nice, but it's kinda just the effect of how humans are set up to start preparing for a baby even before the egg is fertilized, giving them like, 3 days of head-start in case fertilization DOES occur. Topical video: https://t.co/0FWz7aMI4h
Why Do People Have Periods When Most Mammals Don't? https://t.co/iQd5JZqWS2 via @YouTube
https://t.co/UYC0XKl6Vo
#TodayILearned The cycling construction & destruction of the female human uterine lining serves as a filtering process to protect the mother (host) from metabolically aggressive fetal aneuploidies that can act like parasites. https://t.co/4NZOxIVqo7 via @YouTube
This is an interesting video. I know I've frequently asked this question, even though I've been incredibly lucky at not having a regular period. 3-4 times a year mostly, sometimes more, but more frequently less. But when I do have one, I'm pretty... https://t.co/fLgP9WbBS8
This is actually enlightening. https://t.co/6siaXoSu6m
RT @SciShow: Most mammals don't menstruate, so why do humans? Scientists have had some bizarre ideas over the centuries, but we seem to fin…
I recommend this @SciShow video: "Why Do People Have Periods When Most Mammals Don't?" As a man, I never knew much about the topic beyond being glad that I didn't get them. Bonus points for being gender neutral when talking about it. https://t.co/FWLXVZjUrX
This seems like good information. @DrJenGunter is this accurate? As a man that isn't a doctor or a biologist I don't know much about this subject. https://t.co/SVT6Ux2sW6
Why Do People Have Periods When Most Mammals Don't? https://t.co/XFxh68GuZF
RT @SciShow: Most mammals don't menstruate, so why do humans? Scientists have had some bizarre ideas over the centuries, but we seem to fin…
RT @kevinpbreslin: https://t.co/HXADn0SKZ9
Most mammals don't menstruate, so why do humans? Scientists have had some bizarre ideas over the centuries, but we seem to finally be getting somewhere. https://t.co/vT0AXVYcPZ https://t.co/SgUNrTqRIY
https://t.co/HXADn0SKZ9
Why Do People Have Periods When Most Mammals Don't? https://t.co/7PQTZ1WFhv vía @YouTube
Why do we menstruate? https://t.co/5MmI7JPBoA
Why Do People Have Periods When Most Mammals Don't? https://t.co/QYTyhMhrth via @YouTube
I am so into the Choosy Uterus Hypothesis for menstruation, miscarriages, and why not all zygotes become fetuses. https://t.co/JTPP1vzJ4I
https://t.co/D1LcB6wNkj
Why Do People Have Periods When Most Mammals Don't? https://t.co/GLuZlDf5Bu via @YouTube
Why Do People Have Periods When Most Mammals Don't? https://t.co/5sERZWGjAe via @YouTube
Why Do People Have Periods When Most Mammals Don't? https://t.co/ESg6fGYCG5 via @YouTube
Why Do People Have Periods When Most Mammals Don't? https://t.co/v3flel4vfr via @YouTube
.@scishow drinking game rules - 1 sip every time they avoid using male/female Their latest video is on periods: F̶e̶m̶a̶l̶e̶ Humans Menstrators Half of People We/Us Half of humanity Menstrating people People Parent Host Half of us People whose uteruses https://t.co/WFkT0fwsvl
https://t.co/BNxj9Lfhrg
Why Do People Have Periods When Most Mammals Don't? https://t.co/0WTXm59FUE via @YouTube
Important information.. https://t.co/QhgvbcWaDe
RT @kryes: மனிதப் பெண்களுக்கு மட்டுமே "மாத விலக்கு" ஏன்? ஏவாள் சாபமா?:) சில விலங்குகட்கும் எப்படி? அவையும் ஆப்பிள் தின்னுச்சா?
https://t.co/7Kv5nrf1JV I have always had thought about whether female animals menstruate! Surprisingly some animals do... but not all
TS
A
MH
P
كن
YT