Video summary
The discussion centers on the relationship between Body Mass Index (BMI) and female attractiveness, challenging the Western-centric view that lower BMIs are universally preferred by men. While it is acknowledged that in industrialized contexts where food scarcity is not an issue—such as among wealthy groups or historically affluent populations—men often prefer lighter body weights, this preference does not hold across all human history or cultures. In many traditional societies and those facing resource instability, such as the South African Zulu community, higher BMIs are considered highly attractive; for instance, a BMI of 38 is viewed positively in that context despite being classified as obese by Western standards. This divergence highlights a critical flaw in relying solely on evolutionary psychology theories without considering environmental factors like food availability and economic stability. The core argument presented is the "Environmental Security Hypothesis," which posits that human mate preferences are flexible rather than fixed, adapting to current ecological conditions based on caloric security. In environments characterized by unstable resources or famine risks, men tend to prefer women with more body fat because such deposits serve as a conspicuous sexual signal of fertility and survival capability. Unlike other primates, humans possess year-round fat deposits in specific areas like the breasts, buttocks, and hips, which function specifically as signals for reproductive health. When calories are scarce or unpredictable, a woman's ability to maintain these reserves indicates she can survive famine periods while remaining fertile, whereas low body fat is associated with infertility after a certain point. Consequently, during times of economic downturns or scarcity, men across cultures show a stronger preference for heavier mates who signal resilience and resource acquisition skills through gathering activities like collecting tubers, fruits, nuts, and berries. Conversely, in periods of abundance where resources are plentiful, the criteria for attractiveness shift toward signaling status, youth, and null parity (having not yet given birth), which are often associated with a leaner physique. This dynamic is observable both within cultures over time and across different cultural groups; for example, American Playboy centerfold models have historically become heavier when the economy declines and lighter during economic booms. A particularly illustrative study conducted at a university dining hall demonstrated this psychological shift in real-time: men preferred women with higher body weights before dinner but shifted their preference toward thinner bodies after eating, suggesting that immediate caloric security alters mating calculus instantly. This evidence supports the idea that our evolved psychology is not rigidly programmed to prefer thinness by default but rather calculates mate value based on whether an environment feels secure or precarious regarding food supply. The conversation also addresses common misconceptions in evolutionary literature and popular culture, noting a tendency for some researchers to overemphasize preferences for thinness while ignoring the behavioral ecology perspective that emphasizes environmental adaptability. The speaker references Jordan Peterson's public comments regarding plus-size models with favorable waist-to-hip ratios as an example of how mainstream discourse often overlooks established scientific findings about mate preference plasticity. If a recession were to occur, even individuals who previously preferred thinner partners might find curvaceous figures more attractive due to the subconscious activation of survival-based selection mechanisms. Ultimately, the summary concludes that female BMI attractiveness is not a static trait but a fluid response to socio-ecological contexts, where heavier mates are favored when environmental security is low and lighter mates become preferable only when resource abundance allows for different signaling priorities like status and youth.
Read the full video transcript
body shape BMI body shape BMI yeah so
this this
is in a western context quite low bmis
are attractive to men right I'm not
denying that at all right for the most
part in in and in an industrialized
context generally right among wealthy
groups of people right or historically
wealthy where where starvation isn't a
problem yeah there there's there's a lot
of evidence that men prefer lighter body
weights right but if you take a more
Broad View
it doesn't this is not and this is this
is going to get into some of the
reservations I have about just jumping
to Evy as the tool to use because people
have come up with these Evy theories for
like why women why why thinner women are
you know a better choice and then it's
like okay well we didn't evolve in like
a modern Western media uh hyper wealthy
at least historically unlimited food at
the grocery store down the street
situation right we evolved in a pretty
you know probably unstable probably
relatively scarce environment or can we
at least say that and so if you look at
you know more traditional societies
often
times often times plumper is better
right where it's literally women with
more body fat are considered sexier
right and presumably up to a
limit yeah but you'd be shocked I mean
if you look at for example uh and this
isn't this isn't necessarily a more
traditional Society it's just a society
that historically has dealt with more
resource scarcity than Urban Japan but
if you look at say the South African
Zulu you'll consistently find bmis of up
to 38 being considered very attractive
and and in the west we'd be like that is
a that a very heavy person right just
frankly
right so what what's going on there well
one thing to notice first is that tons
of women's tons of women's evolved
sexual signaling is conspicuous fat
deposits right so we're the only primate
that has year round fat deposits on the
breasts right for example we have
conspic conspicuous fat deposits on the
buttocks as well especially in women
right and on the hips right so fat to an
extent in women is clearly works as a
sexual signal right there's something
desirable there and it seems that right
in a in a within in a within cultures
context there's some
evidence
that within cultures at least people who
are enduring more stress and scarcity
tend to opt for heavier mates right men
tend to opt for heavier women and those
who are in a period of abundance right
they they've got lots of resource
resources tend to opt for relatively
lighter mates another piece of evidence
for this right can be found so that's
within cultures cross-sectionally we can
also see this evidence across time right
for example American Playboy colds right
they become heavier when the economy
goes down and they become lighter when
the economy goes up you're kidding me
yeah yeah yeah no that that that that's
a real result and I'll send you the PDF
another what's the before you get on
that what's the proposed mechanism what
do you think's going on to to make oh
excuse me I should have I should have
set up
front imagine you're in an environment
where calories are either absent or
unstable right so you're in a situation
where it's like I don't know either I
don't have food right now or I don't
know if I'm going to have food next
month your brain is trying to determine
who you should M with it's doing it's
doing calculations behind the scenes
saying whose mate value in this socio
eological context is desirable and so
the theory right and this this certainly
isn't my theory I'm I'm I'm not
presenting it as such but the theory
from this tradition of research the the
environmental security
hypothesis proposes that and there's
convergent forms of evidence which we'll
discuss and already have discussed in
any sent proposes that if you're in that
situation it's like okay well who's
going to be fertile if there's a famine
or who's going to be fertile during
famine right who's going who is able to
obtain calories right so women engage in
tons of caloric acquisition and
traditional environments often times
more than the men in fact despite you
know Western conceptions of this and so
because they're doing you know they're
they're Gathering tubers and to an
extent engaged in hunting as well but
mostly Gathering right Gathering fruits
nuts berries all the stereotypical
things and so you're looking around
you're in the situation where you're
literally hungry and it's like who's
who's sexy right now and then a woman
who is clearly advertising that she can
obtain calories survive a famine and
stay fertile right during periods of
scarcity right because low body fat is
associated with infertility after a
point right it's it's an incredible
supressant well that that woman is going
to be more attractive than the woman who
looks like if anything goes wrong she's
going to die right now in a western
context where you're not necessarily
thinking that right where that's that's
not an issue well then you might be
concerned with things like status right
signaling that like you can afford to go
to the gym that sort of thing then
you're going to be concerned with things
like youth right having you know Youth
and let's say null parity right the
state of not having had kids yet right
which is signaled by an incredibly spelt
body right and so maybe it makes sense
in a resource abundant context to prefer
that but in a resource scarce context
which is where most of our evolved
psychology occurred uh we see we see the
we see that heavier mates seem to be
preferred now the evidence for this and
I'll just recap very very
quickly within cultures it seems that
those who are you know on the on the
lower end of things resources wise tend
to prefer heavier mates across time
right it seems that the media that men
consume of you know pornographic media
the women get heavier when things are
going poorly economically and they get
lighter when things are going well so
that's across time within cultures now
let's talk about within individuals
there's a very funny study where they
literally they showed up at the
University dining hall and it's genius
study to be honest and they're like okay
you guys are about to have dinner which
of these you know what what do you think
what what weight do you think is sexiest
what body type do you think is sexiest
and they found that before dinner the
men preferred heavier mates than after
dinner right so now we've got within
person's evidence within cultures
evidence and across time evidence and
then we've got this very you know we
talked about flashy theories that that
do well we've got a great story as well
uh so you were asking about BMI and its
attractiveness in women yes it's true
that in you know a a western context and
maybe broadly in an industrialized
context this this is more attractive but
that doesn't mean that that's the
default state of our species and you
know plenty of men prefer women with uh
with more curvaceous figures I mean I I
honestly I remember um I think did you
recently have Jordan Peterson on right
I'm remembering correctly y I remember
when he you know had the G to tweet not
attractive with the picture of the
plus-size model who has a hip to waist r
a waist to hip ratio of like s an
incredibly feminine symmetrical average
face and it's like maybe not to you but
to most men throughout history that
would be one of the highest mate value
women that they'd ever encountered if we
entered a recession next week then it
might get a little bit more she might be
a little bit more attractive to
everybody and I think that she she all I
mean not speaking about any specific
women you know that that's certainly not
it's not certainly not my style to talk
to comment on like specific women
women's bodies but like it was one of
those glaring examples where it's like
okay well you know Dr Peterson you're
clearly not aware of this literature
yeah so couple of interesting first off
is there a name for this is it like the
economic mediation of female BMI
hypothesis I've it called the
environmental security hypothesis uh but
you know the last it it started getting
research on it about 20 years ago then
you know it just they just hit a few
home runs and then it was like okay this
seems to be true all right um but again
it's this is the difference between
behavioral ecology and evolutionary
psychology is that evolutionary
psychology if you read one of their
literature reviews on thinness you'll
just read about how you know not you
know I'm not trying to character anybody
but you'll often read stuff about just
why thinness is our psychology evolved
prefer thinness and then if you read
someone from a more behavioral ecology
standpoint it's like well in as much as
we have a default state it seems to be
towards you know slightly heavier right
than is current um but we don't really
have a default State it's flexible based
on the environment and uh and that's
yeah I'd say that that's pretty tied up
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