Testosterone Expert: The Truth About DAD BOD & Why Women Find Fathers More Attractive!
Dr. Darby Saxbe, a psychology professor, reveals the "parental brain" science, detailing how fatherhood reshapes men's brains, hormones, and relationships. She also discusses societal impacts on birth rates and offers practical advice for new parents.
Deep Dive Analysis
24 Topic Outline
Introduction to the "Parental Brain"
Father's Brain Shrinkage and Increased Efficiency
Maternal Brain Changes and Biological Investment
Cultural Influence on Fatherhood Engagement
Testosterone Drop in New Fathers and Its Adaptive Role
Fatherhood's Profound Shift in Values and Priorities
The Visible Downsides and Invisible Upsides of Parenting
Couple Conflict During Pregnancy and Birth Outcomes
Why There's No "Perfect Time" to Have Kids
Global Declining Birth Rates and Societal Impact
Neuroprotective Benefits of Parenthood for Brain Health
The Role of Oxytocin and Social Bonding
Daycare, Alloparenting, and Attachment
Maternal Gatekeeping and Weaponized Incompetence Dynamics
Relationship Satisfaction and Intimacy After a Baby
Understanding Paternal Postpartum Depression
Cortisol Interconnection as a Divorce Predictor
Concealed Ovulation and Human Pair Bonding
Comprehensive Advice for Expectant Fathers
The Adaptive Significance of the "Dad Bod"
Personal Influence on Fatherhood Research
Human Monogamy: "Monogamous with Benefits"
Major Concerns About Modern Parenthood
Systemic Changes to Support Parents
10 Key Concepts
Volume Reduction (Brain)
In the context of parenthood, this refers to the shrinking of gray matter in the brain, which is not a deficit but an adaptive process where the brain becomes more efficient by building better-connected pathways and consolidating information to focus on child-related inputs.
Facultative Adaptation
A biological adaptation that is optional but extremely useful, meaning it varies depending on cultural and environmental contexts. Fatherhood is described as facultative, as men's investment in parenting is modulated by what they learn from their environment.
Mentalizing Network
A part of the brain concentrated around the midline of the cortex, crucial for understanding other people's feelings and intentions. In new fathers, this network shows volume reduction, indicating improved efficiency in social information processing.
Alloparenting (Cooperative Breeders)
The concept that humans are a species designed to raise children in a community, with shared care from multiple individuals beyond the biological parents. This model evolved to provide support and reduce parental isolation.
Maternal Gatekeeping
A dynamic where a mother, consciously or unconsciously, creates roadblocks to a father's full participation in parenting, often by taking over tasks or not trusting his abilities, which can lead to dads feeling sidelined.
Weaponized Incompetence
A behavior where a partner, typically the father, feigns inability or lack of knowledge regarding household or childcare tasks, causing the other partner, typically the mother, to assume responsibility. This can lead to frustration and an imbalanced division of labor.
Perinatal Depression
A term for depression that occurs around the birth of a baby, applicable to both mothers and fathers. It acknowledges that the period following birth is a time of increased mental health risk for both parents due to various factors.
Concealed Ovulation
A unique human characteristic where female fertility cues are not overtly displayed. This encourages pair bonding and repeated sexual activity, fostering stable monogamous relationships and reducing male rivalry.
Proprioceptive Touch
A type of vigorous physical touch, such as picking up, moving, and playing with babies in space, often associated with fathers. This kind of touch can increase oxytocin levels in dads and helps children develop risk tolerance and emotion regulation skills.
Matrescence/Patrescence
These terms describe the profound psychological and identity transformations experienced by individuals as they become mothers (matrescence) or fathers (patrescence). It signifies a reordering of priorities and self-concept.
15 Questions Answered
A man's brain loses gray matter volume, particularly in the mentalizing and visual areas, which is an adaptive process making the brain more efficient at processing social information and understanding infant cues.
Testosterone typically drops by about 25% in hands-on fathers, which is an adaptive biological shift that helps men transition from a competitive, high-testosterone state (for maximizing offspring production) to a nurturing, investing mode for child-rearing.
No, men should not be overly concerned, as masculinity is not solely about a particular hormone level. Flexible, mid-range testosterone levels are adaptive for fatherhood, and very high or very low levels can have downsides for relationships and mental health.
Many fathers experience a profound shift in values, moving from material or career-focused goals to prioritizing their children and seeking meaning and purpose through their parenting role.
When couples engage in more negative conflict behaviors (criticism, contempt, stonewalling) during pregnancy, they are more likely to experience medically complex births and appraise the birth as more stressful.
No, there is no perfect time to have children; historically, having kids was a foundational life event that provided impetus for building stability, rather than a capstone achieved after all conditions are perfect.
Yes, emerging research suggests that being a parent is neuroprotective in late life, with studies finding that both men and women who have had more children (especially two or three) have markers of a younger-looking brain age.
Oxytocin, the bonding chemical, is neuroprotective, actively downregulating harmful pro-inflammatory cytokines in the brain and enhancing brain plasticity, which can improve learning and memory as parents age.
While very young babies (under 18 months) may benefit from a single caregiver, group care settings like daycare can be beneficial for toddlers (18 months and beyond) as humans are an alloparenting species designed for shared care.
Yes, fathers can experience postpartum depression, with new dads having about twice the risk of depression compared to non-fathering men, due to a combination of hormone, sleep, identity, and relationship changes.
While not a direct predictor, studies show that when couples have strongly linked cortisol levels (meaning they are contagious to each other's stress), they report lower marital satisfaction, suggesting that modulating stress is beneficial.
Human ovulation is concealed, unlike in many other animals, to encourage pair bonding and repeated sexual activity, fostering stable monogamous relationships, reducing male aggression, and increasing altruistic investment in children.
Reducing stress is important for conception, as stress makes it harder to conceive. Creating a calmer and safer environment, alongside optimizing nutrition, can help, though much is not entirely within one's control.
The "dad bod" refers to the mild weight gain men often experience as new fathers, which is an adaptive biological change. Research suggests women find it attractive as it signals a man is more likely to be a hands-on, attentive, and caring father.
Building a better policy environment around parenting, specifically universal paid parental leave, would be a positive change, as the U.S. is a significant outlier in not providing federal-level paid leave.
11 Actionable Insights
1. Prioritize Relationship Communication Before Birth
Work on communication with your partner and discuss how to divide baby care responsibilities and core values (e.g., extended families, religion, education) before the baby arrives to prevent frustration and conflict and foster mutual trust.
2. Build a Strong Social Support Network
Actively build or strengthen your social support network with friends, family, and other expectant parents before birth, as loneliness and isolation are common challenges, and community support is crucial for alloparenting.
3. Embrace Hands-On Baby Care
Actively engage in all baby care opportunities, even seemingly unpleasant ones like changing diapers, as these moments offer chances to bond, build confidence as a parent, and develop attuned caregiving skills.
4. Protect Your Sleep Foundation
Establish healthy sleep routines and good sleep hygiene (e.g., dimming lights, optimizing room temperature, avoiding devices before bed) before the baby comes, as sleep deprivation will be a major challenge, and a strong foundation helps mitigate risk.
5. Give Yourself Parental Grace
Recognize that the transition to parenthood is profoundly challenging but temporary, requiring short-term sacrifices that ultimately lead to long-term fulfillment, meaning, and a richer life purpose.
6. Address Negative Conflict Behaviors
During pregnancy, focus on effective conflict resolution by conveying understanding and validating your partner’s perspective, avoiding criticism, contempt, or stonewalling, as negative conflict can lead to more medically complex births and increased stress.
7. Don’t Wait for the “Perfect Time” to Have Kids
Understand there’s no ideal moment for parenthood; historically, having kids was a cornerstone that motivated building stability, rather than a capstone after achieving perfection, and biology doesn’t always wait.
8. Be Flexible with Testosterone Expectations
Don’t be overly concerned about a drop in testosterone with fatherhood; it’s an adaptive biological shift that helps men switch into nurturing mode, and mid-range, flexible levels are optimal for both parenting and relationship satisfaction.
9. Engage in Vigorous Physical Play with Kids
Fathers, especially, should engage in physically demanding play like picking up and throwing kids (safely), as it helps children build risk tolerance and emotion regulation skills by practicing fear and relief.
10. Consider Shared Care for Toddlers (18+ months)
Group care settings like daycare can be beneficial for children aged 18 months and older, allowing them to thrive with social interaction and providing sustainable support for parents, aligning with our alloparenting nature.
11. Prioritize Couple Time Post-Birth (Early Newborn Phase)
Take advantage of the early newborn phase, when babies are more portable, to go on “date nights” (e.g., bringing the baby in a car seat to a restaurant) to protect relationship quality before children become less portable.
8 Key Quotes
So we found that in fathers, the brain is actually shrinking, and I'll explain why. But also there are studies that find that both men and women who report having had more kids have markers of a younger-looking brain age.
Dr. Darby Saxbe
Volume reduction is not a bad thing. What it means is that the brain is actually working more efficiently because it's building better connected pathways and better channels for communicating information.
Dr. Darby Saxbe
I think a lot of the downsides are really visible. Yeah. Like we've all been on a plane with a crying kid and we've seen the frantic parent trying to calm them down. We've all seen a tantrum in the grocery store, right? Like that stuff is right in your face. But the upsides are sort of invisible...
Dr. Darby Saxbe
There is no right time. You just have to do it. You just have to make it work. Because once the baby shows up, you'll figure it out.
Dr. Darby Saxbe
We are an alloparenting species. So what that means, we're cooperative breeders. We raise our kids in community. That's how we evolved. That's if you look at hunter-gatherers, that's how they raise their kids. We are not designed to do this in isolation.
Dr. Darby Saxbe
It's like Sudoku for your social cognition, right? It's like you're doing crossword puzzles, but instead of like, you know, the sort of practice that you're getting for putting words together, you're getting practice understanding people's minds and intentions and communicating and responding to them and being sensitive to them.
Dr. Darby Saxbe
Great fathers are made not born. You might feel like you don't have the qualities to become an amazing dad, but it's really about your time, your investment, the practice that you get, and the extent that you care that is going to shape you.
Dr. Darby Saxbe
If you show women torsos of different kinds of male body types, the sort of dad bod is one that women say he's more likely to be a hands-on father. He's probably going to be more attentive. He's going to be more caring. And those are things that are really attractive to women.
Dr. Darby Saxbe
1 Protocols
Preparation for Fatherhood
Dr. Darby Saxbe- Take advantage of the window before birth to work on communication with your partner.
- Discuss how you want to divide up baby care responsibilities and core values (e.g., extended families, religion, education) before the baby comes.
- Build up your social support network with existing friends, family, and new community (e.g., other expectant parents, Daddy Stroller Social Club).
- Protect your sleep by establishing healthy routines and good sleep hygiene (e.g., dim lights, right room temperature, no devices before bed) before birth.
- Think of preparing for parenthood like running a marathon, focusing on overall health.
- Once the baby comes, take any opportunity to bond, like changing diapers, to get to know your baby and build confidence.
- Give yourself grace, knowing it's hard but temporary, and that sacrifices lead to long-term benefit.
- Prioritize date nights, even if it means bringing a newborn in a car seat to a restaurant, as newborns are more portable.