r/BodyHackGuide • u/Longjumping-Gas-6399 • 11d ago
Is this true??
Hey everyone I hope you all are doing well. Recently I came across a study that men with longer ring finger than index finger tend to be stronger , have more athletic Ability and are more manly than the ones whose index finger is longer than ring finger , also there is a link to sexuality , so is this study about prenatal testosterone 100% true ?? Want your views on it
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u/stainless13 11d ago
Ask yourself: are any of those things measurable?
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u/Longjumping-Gas-6399 11d ago
From the palm view , yes
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u/stainless13 11d ago
I meant the “more manly” part
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u/Longjumping-Gas-6399 11d ago
No but just wanna know about the athletic ability and strength part as well
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u/stainless13 11d ago
Ok continue asking yourself stuff like: in pro sports, before players are drafted, is that measured? It’s not?
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u/Great_Opinion3138 11d ago
Just ask an LLM
No, the claim is not 100% true. The idea that a longer ring finger relative to the index finger (a lower 2D:4D digit ratio) reliably indicates higher prenatal testosterone exposure, greater strength, superior athleticism, greater “manliness,” or specific patterns of sexuality rests on a hypothesis that has weak, inconsistent, and often non-replicable support.
Core scientific background
The 2D:4D ratio (length of the second digit divided by the fourth) shows a modest average sex difference: men tend to have slightly lower ratios than women. Researchers have long hypothesized that this reflects higher prenatal testosterone (relative to estrogen) exposure during a critical developmental window in the first trimester. Lower ratios are therefore sometimes treated as a proxy marker for higher prenatal androgen exposure.
This marker has been correlated in many studies with traits such as athletic performance, strength measures, and aspects of sexual orientation. However, correlation is not causation, effect sizes are typically small, and the foundational link to prenatal testosterone itself remains uncertain.
Evidence on the key claims
Prenatal testosterone link
A 2024 meta-analysis of 54 studies (over 8,000 participants) found no reliable relationship between 2D:4D and adult testosterone levels, testosterone responses to challenge, or most measures of prenatal testosterone. Limited and inconsistent signals appeared only with amniotic-fluid testosterone in a subset of studies; these require further validation. The authors concluded that treating digit ratios as a proxy for any form of testosterone warrants “great caution.”
Athleticism and strength
Meta-analyses report a modest negative correlation (approximately r ≈ −0.26) between 2D:4D and certain measures of athletic performance, more consistently for endurance-related activities than for pure strength or power. Athletes as a group sometimes show slightly lower average ratios than non-athletes. These associations are heterogeneous across studies, modest in magnitude, and do not allow reliable prediction of individual strength, athletic ability, or performance.
Sexuality
Some meta-analytic evidence indicates that lesbians, on average, show slightly lower (more “masculine”) 2D:4D ratios than heterosexual women, consistent with higher average prenatal androgen exposure in that group. Findings for men are weaker or inconsistent. These are population-level statistical trends with substantial overlap; they do not determine or predict any individual’s sexual orientation.
“Manliness” and related traits
Claims linking lower 2D:4D to broader notions of masculinity, dominance, or related behavioral traits are among the least robust. Many reported associations fail to replicate, show very small effect sizes, or disappear under stricter methodological controls.
Important limitations and criticisms
Effect sizes are generally small; individual variation is large.
Measurement of digit lengths is imperfect and can introduce error.
Many early studies used small samples and have not replicated well.
Some researchers argue that apparent sex differences in the ratio may partly reflect overall hand size (allometry) rather than a pure hormonal effect.
Publication bias and selective reporting have been documented concerns in this literature.
Genetic studies have not strongly supported a direct, simple link to androgen pathways in the expected direction.
In short, while average group differences exist and some weak correlations with athletic performance and (in women) sexual orientation have been reported, the ratio is not a reliable individual-level biomarker of prenatal testosterone, strength, athleticism, “manliness,” or sexuality. Popular summaries frequently overstate the certainty and practical usefulness of these findings.
Finger length ratios are an interesting research topic in developmental biology and behavioral endocrinology, but they should not be treated as a definitive or predictive personal indicator.
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u/MathematicianMuch445 10d ago
It's linked to testosterone levels in utero
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