Modern WisdomThe War Inside Women: How Hormones Influence Psychology - Dr Sarah Hill
CHAPTERS
- 0:00 – 1:54
Why Sarah Hill wrote a second book: the evolutionary puzzle of PMS
Chris opens by joking about Hill’s body of work, and Hill explains the real motivation behind her new book. She frames the last two weeks of the menstrual cycle as an evolutionary mystery: why would so many women feel mentally and physically worse so often if it served no purpose?
- •Hill contrasts her first book (sparked by personal experiences with the pill) with this one (sparked by questions about the luteal phase)
- •PMS as an evolutionary puzzle: widespread misery shouldn’t be “design” without function
- •The idea that a lack of understanding—not biology alone—may drive much of the suffering
- 1:54 – 5:39
Menstrual cycle 101: two reproductive “jobs” and two dominant hormones
Hill lays out the cycle’s core logic: female reproduction requires both mating and pregnancy preparation. Estrogen largely coordinates attraction/sex, while progesterone coordinates implantation and pregnancy readiness—yet progesterone is culturally neglected.
- •Reproduction as two tasks: sex/attraction vs implantation/pregnancy
- •Estrogen’s role in energizing and mating-oriented behavior
- •Progesterone as the under-discussed hormone shaping the second half of the cycle
- •Claim: medicine/science often treats women as ‘small men,’ overlooking cyclical biology
- 5:39 – 6:39
Follicular phase lived experience: low hormones → rising estrogen → ‘best self’ window
Hill describes the first half of the cycle starting at menstruation, when hormones are low and many feel depleted. As estrogen rises, many women experience increases in energy, libido, sociability, and overall wellbeing—changes that align with fertility timing.
- •Day 1 begins with menstruation; early days often feel draining
- •Rising estrogen boosts energy, sexual desire, and outward orientation
- •Behavioral shifts interpreted as functional: increasing odds of conception
- •Ovulation typically around day 14 in a 28-day cycle (as a reference point)
- 6:39 – 10:11
Luteal phase biology: progesterone, the ‘sensitive smoke detector,’ and energy conservation
After ovulation, progesterone becomes dominant and changes threat processing, motivation, sleepiness, and appetite. Hill explains how the luteal phase can make the amygdala more threat-sensitive and the body more geared toward conserving energy for possible pregnancy.
- •Corpus luteum produces progesterone post-ovulation
- •Amygdala connectivity and threat sensitivity increase; lower threshold for “alarm bells”
- •More homebody/withdrawal tendencies; reduced approach motivation
- •Increased GABAergic activity contributes to a calmer/slower brain state
- 10:11 – 13:31
Metabolism, immunity, and medication: why the second half can feel worse than it should
Hill expands beyond mood into physiology: basal metabolic rate rises, cravings can reflect real energy needs, and immune responses shift. She argues many PMS-like symptoms are amplified by a lack of cycle-specific guidance (food, training, sleep, medication timing).
- •Basal metabolic rate increases ~8–11% in luteal phase; some need ~150–200 extra calories/day
- •Body temperature rises; sleep and recovery demands change
- •Immune response shifts (pro- to anti-inflammatory patterns) affecting symptoms of conditions (e.g., asthma, autoimmune issues)
- •Medication effects can vary; some report ADHD meds feel less effective
- •PMS framed partly as an avoidable mismatch: one-size-fits-all routines vs cyclical needs
- 13:31 – 20:25
Sexual “high-resolution perception”: testosterone cues, mate choice, and ‘good genes’ logic
Hill reviews research suggesting women become more attuned to subtle testosterone-related cues near high fertility. She connects scent and facial perception to hypotheses about genetic quality and immunocompetence, while acknowledging complexity in how these cues are interpreted.
- •Women detect finer differences in testosterone metabolites near high estrogen/high fertility
- •Lab work on perceptual thresholds (e.g., subtle face morphs) changes across cycle
- •Testosterone as a proxy cue: immunosuppression implies only robust individuals can “afford” high T
- •Masculinized traits (face/voice/build) linked to developmental hormone exposure
- 20:25 – 24:25
Ovulatory Shift Hypothesis: replication controversies and what seems most robust
Chris presses on the replication crisis around ovulatory shifts in preferences. Hill argues the strongest evidence comes from longitudinal within-woman designs and that some effects (like libido increases) replicate more reliably than specific preference shifts.
- •Replication mixed: preference shifts appear in some studies and not others
- •Methodological issues: fertility assessment and between-women comparisons can muddy results
- •Most robust: increased sexual motivation around high fertility
- •Hill’s stance: testosterone/masculinization preference shifts likely exist but vary by trait and method
- 24:25 – 34:19
Fertility signals to men: T-shirt studies, ‘panty liner nebulizer’ research, and male hormones
The conversation turns to how men respond to ovulatory cues. Hill describes scent studies (including an unusually provocative experimental design) showing men rate high-fertility odors as more attractive and may show hormonal changes in response.
- •T-shirt studies: men prefer scent of high-fertility phase vs luteal phase in the same women
- •Panty-liner odor experiments: high-fertility exposure increases men’s liking and may raise testosterone/cortisol
- •Discussion of other possible cues (e.g., gait/silhouette attractiveness studies)
- •Broader implication: fertility cues can operate below conscious awareness
- 34:19 – 44:03
Why humans have non-conceptive sex: luteal sex as pair-bonding and ‘relationship cement’
Hill explains why humans differ from many mammals by having sex outside fertile windows. She argues luteal-phase sex may be more motivated by bonding and security than raw desire, and may be linked to relationship maintenance when vulnerability is higher.
- •In many mammals, sex is restricted to estrus; human sex is more continuous
- •Sex can be physiologically costly (inflammation/immune activity), especially luteally
- •Luteal sex often shifts toward connection/pair bonding (oxytocin-related mechanisms)
- •Women who feel more relational insecurity may show higher luteal sexual motivation
- •Practical implication: libido and “what sex is for” can change across the month
- 44:03 – 48:17
So why does PMS feel so miserable? Missing blueprints, modern mismatch, and self-care timing
Chris highlights the gap between ‘adaptive shifts’ and lived misery. Hill attributes much of the suffering to cultural ignorance and modern environmental mismatch—diet, sleep, inflammation, training load, and expectations that women remain identical every day.
- •Cultural narrative treats women as constant-state ‘small men,’ obscuring phase-specific needs
- •Under-fueling and under-recovering can worsen crankiness, cravings, and fatigue
- •Physiology shifts: higher HR, lower HRV, higher temperature, harder deep sleep
- •Inflammation and lifestyle factors reduce resilience to hormonal swings
- •Idea: track, adjust, and “ride the wave” rather than fall off a cliff
- 48:17 – 56:27
Are women ‘more hormonal’ than men? Predictability vs reactivity in sex hormones
Hill rejects the idea that women are more hormonally driven than men—both sexes are hormonally mediated, but in different ways. Women’s sex hormones change more predictably over weeks; men’s testosterone follows circadian rhythms and reacts more acutely to context.
- •Men: testosterone peaks in the morning and responds to environmental cues (competition, attraction, context)
- •Women: estrogen/progesterone follow more predictable cyclical patterns
- •Volatility vs predictability: male hormones can be less predictable day-to-day
- •Narrative critique: ‘women are hormonal’ is partly an artifact of men being studied first
- 56:27 – 1:02:21
The pill and the ‘period brain’: flattening the cycle, progestins, and mood mechanisms
Hill explains how hormonal contraception suppresses ovulation and flattens endogenous hormone production. She distinguishes natural progesterone from synthetic progestins, arguing differences in metabolism (including reduced allopregnanolone) may underlie mood and anxiety effects.
- •Pill inhibits ovulation via progestin signaling to the brain; estrogen/progesterone production is suppressed
- •Pill state resembles aspects of the luteal phase but isn’t identical
- •Progestins are not progesterone; many are derived from testosterone or spironolactone pathways
- •Natural progesterone metabolizes into allopregnanolone (calming neurosteroid); pill users may have less
- •Links discussed: increased depression risk, especially in teens; anxiety/mood side effects and under-communication in clinical settings
- 1:02:21 – 1:05:58
Downstream relationship effects and ‘authentic self’ debate: libido, satisfaction, and tradeoffs
Chris probes claims about relationship satisfaction and identity changes on the pill. Hill suggests lowered desire and mood changes can reduce relationship satisfaction, and frames contraception as masking parts of the cyclical self—sometimes welcomed, sometimes not.
- •Reported lower relationship satisfaction may be mediated by mood changes and/or reduced sexual desire
- •Lower libido and attraction can reduce perceived relationship “bandwidth”
- •Hill’s framing: the pill can mask aspects of the authentic cyclical self (analogous to other psych meds)
- •Acknowledges individual differences: some women prefer the stability/predictability
- 1:05:58 – 1:11:31
Could female fertility suppression affect male testosterone? Two pathways: cues + fatherhood effects
Chris and Hill explore a speculative but plausible macro-level idea: widespread suppression of ovulatory cues might reduce men’s testosterone. Hill adds a second pathway—testosterone decreases with pair-bonding and caregiving—and argues modern shifts in parenting roles may contribute too.
- •Hypothesis 1: fewer ovulatory cues in the environment could mean fewer testosterone-boosting signals for men
- •Hypothesis 2: testosterone drops in long-term relationships and with fatherhood, especially with more caregiving
- •Greater egalitarian parenting could ‘tap the brakes’ on male testosterone more than in past generations
- •They note lack of direct research and call for studies
- 1:11:31 – 1:17:51
Work, burnout, and designing life around physiology (without ‘schedule meetings by period’)
Chris asks whether modern work structures push women toward burnout by ignoring cyclical needs. Hill says women do show higher burnout rates and argues practical mitigation is less about workplace accommodation and more about personal recovery, fueling, and expectations—especially in the luteal phase.
- •Modern 9-to-5 norms don’t flex with predictable monthly physiology
- •Women may be more burnout-prone given luteal recovery constraints (sleep, HRV, temperature)
- •Hill rejects impractical workplace demands; emphasizes self-care adjustments instead
- •Discussion of birth control as “flattening” (but not necessarily enhancing) performance
- 1:17:51 – 1:21:49
Why sex differences matter in science, medicine, and policy—and the cost of pretending they don’t
Hill critiques sex-blind research and ‘bikini medicine,’ arguing it harms women in drug safety, treatment efficacy, and even product design. She connects this to political and cultural pressures that discourage acknowledging sex differences, and argues the result is worse outcomes for women.
- •Research often studies men, then generalizes to women; women included less and analyzed separately even less
- •Examples: drug side effects disproportionately harming women; sex differences ignored in neuroscience studies
- •Bias in standards/design: seat belts, legal ‘reasonable person’ standards, and more
- •Core claim: sex differences are real, non-hierarchical, and crucial for accurate science
- 1:21:49 – 1:36:27
Feminism, biology, and why periods remain understudied—plus practical takeaways and where to find Hill
The conversation closes by contrasting ‘deny differences’ feminism with approaches that integrate biology without prescribing roles. Hill explains how convenience and historical research norms minimized women’s hormonal realities, then offers a practical first step: track your cycle to learn your personal pattern and adjust accordingly.
- •Hill distinguishes acknowledging sex differences from enforcing gender roles (‘sex matters but needn’t be limiting’)
- •Why understudied: convenience, pregnancy concerns, and designing research around non-cycling male baselines
- •Research workaround critique: studying women only when hormones are low or removing ovaries in animal models
- •Actionable advice: track cycle-linked energy, mood, sleep, appetite, libido; then tailor food/rest/training
- •Outro: Hill shares website and social handles
