The Diary of a CEO

Dr. Sara Szal: Cortisol Is The Dictator Behind Belly Fat

How chronic cortisol elevation drives belly fat, mood crashes, and brain shrinkage; perimenopause symptoms go without proper treatment for most midlife women.

SSDr. Sara SzalguestSBSteven Bartletthost

Mar 27, 2025·1h 58m·Watch on YouTube ↗

📖 CHAPTERS

1. 1
   0:00 – 7:10

   Intro: Hormones, Belly Fat, and a Broken System for Women

   The episode opens with the stark statistic that roughly three-quarters of women don’t receive appropriate treatment for perimenopause and menopause, despite experiencing symptoms like new belly fat, stress intolerance, and low libido. Host Steven Bartlett introduces Dr. Sara Szal, a Harvard-trained hormone expert, who argues that hormone imbalance is rampant and that cortisol problems are especially widespread. She sets up her core thesis that many menopausal symptoms and hormone-related complaints are preventable or reversible with the right approach.

2. 2
   7:10 – 30:00

   From Surgeon to Healer: Training, Philosophy, and Precision Medicine

   Szal recounts her journey through elite bioengineering and medical training, including surgery and OB/GYN, and her evolution into a physician who bridges conventional medicine with Ayurvedic and Chinese traditions. She rejects the idea that doctors “heal” people, instead seeing herself as activating patients’ innate healing capacity. As a director of precision medicine, she contrasts individualized, data-rich care with what she calls conventional “medicine for the average,” critiquing profit-driven over-reliance on drugs.

3. 3
   30:00 – 44:10

   Trauma, ACEs, and Discovering Her Own Cortisol and Metabolic Crisis

   Szal links her career motivation to significant childhood trauma measured via a high ACE score (6/10), explaining how ACEs elevate risk for 45 chronic diseases. In her 30s she experienced depression, PMS, stubborn baby weight, high cortisol, and prediabetes—problems her doctor attempted to treat with Prozac, the pill, and generic diet/exercise advice. Unsatisfied, she ordered her own labs, uncovered severe cortisol dysregulation and prediabetes, and began a personal journey using scientific literature and lifestyle interventions to heal herself and later her patients.

4. 4
   44:10 – 59:10

   Cortisol: Dictator Hormone, Trauma Link, and Tools to Rebalance

   The conversation dives deep into cortisol’s outsized role among hormones. Szal explains its necessity for survival and its damaging effects when chronically elevated: belly fat gain, depression, brain shrinkage in women, and suppression of testosterone. She clarifies that stress reduction alone (like holidays) often doesn’t normalize cortisol because the body can become locked into maladaptive patterns, especially after trauma. She outlines top-down (cognitive) and bottom-up (sensory, breathwork, movement) approaches, plus targeted supplements, to restore balance.

5. 5
   59:10 – 1:11:40

   Endocrine Disruptors, Toxins, and the Modern Attention Economy

   Szal outlines how more than 700 endocrine-disrupting chemicals disrupt hormones, including BPA in plastics, parabens in skincare, and flame retardants. She notes that men also need estrogen and progesterone—for bones and sleep—even at lower levels. Both she and Bartlett observe a rise in nervous system dysregulation since the pandemic and with increasing digital engagement, as attention-maximizing algorithms often rely on dysregulating content to retain users.

6. 6
   1:11:40 – 1:30:00

   Metabolic Health, CGMs, Supplements, and Personalized Nutrition

   The discussion turns to blood sugar and metabolic health as foundations for hormonal balance and energy. Szal advocates for continuous glucose monitors as powerful behavior-change tools, explaining how she tailors diets to genetics, goals, and biomarker patterns. She highlights common nutrient deficiencies—especially vitamin D and B vitamins—and a case study of an executive with prediabetes, inflammation, and rising cholesterol whose athletic identity had faded. She repositions him as an “athlete” again to drive behavior change via exercise and methylated B vitamins.

7. 7
   1:30:00 – 2:15:50

   Testosterone, Estrogen, PCOS, and Keto: Sex Differences in Hormone–Food Interactions

   Szal explains the roles of testosterone and estrogen in both sexes, including libido, confidence, body composition, risk-taking, and bone and brain health. She discusses signs of low and high testosterone, especially PCOS in women, and how insulin resistance and diet influence androgen levels. The pair explore ketogenic diets and fasting: beneficial for some, but more challenging for women, with potential impacts on thyroid, cortisol, serotonin, and exercise performance. She stresses biomarker monitoring when adopting strict low-carb or long-term keto.

8. 8
   2:15:50 – 3:03:00

   Perimenopause, Menopause, and the Women’s Health Gap

   Szal outlines perimenopause as a dynamic 35–45+ life stage marked by ovarian aging, fluctuating hormones, brain fuel shifts, and heightened autoimmunity risk. She laments a large research and care gap: women are often misinformed, dismissed as “too young,” or given birth control pills instead of tailored hormone therapy and lifestyle plans. She critiques the pill for raising inflammation, increasing autoimmune risk, lowering free testosterone, and even shrinking the clitoris, arguing that most women aren’t given proper informed consent.

9. 9
   3:03:00 – 3:17:30

   Gender, Stress, Autoimmunity, and the Cost of Being Female

   The conversation zooms out to the systemic “women’s health gap.” Szal notes that women have higher rates of depression, PTSD, insomnia, autoimmune disease, and thyroid dysfunction, influenced by both biological sex differences and gendered social roles. Women experience more stress and trauma (including much higher rates of sexual violence), often shoulder disproportionate emotional labor, and struggle with boundaries and saying no. These patterns, she argues, interact with biology to make being female a health hazard—and must be addressed through cultural, structural, and personal changes.

10. 10
    3:17:30 – 4:00:00

    Relationships, Divorce, Sex, and Nervous System Regulation

    Szal shares her recent divorce after a 22‑year relationship, describing chronic misattunement, poor conflict repair, and loneliness within the marriage despite extensive couples therapy. She credits psychedelic-assisted therapy for helping her see her trauma patterns and “trauma bond” more objectively, though her ex was unwilling to pursue it. The discussion broadens into how sexual polarity, emotional connection, and intentional erotic exploration impact long-term relationships and nervous system regulation—orgasm being a potent way to shift into parasympathetic states.

11. 11
    4:00:00

    Behavior Change, Alcohol, HRV, Sleep, and Daily Brain Care

    In the closing section, Szal emphasizes sleep and recovery as foundational for hormonal and metabolic health. One night of poor sleep raises cortisol and insulin, increases carb cravings, and undermines energy. She uses wearables to track HRV, sleep stages, and breathing, and notes how alcohol can depress HRV for a week or more—one of the reasons Steven quit drinking. She also mentions practices like grounding, time in nature (especially Costa Rica), microdosing mushrooms, and morning sunlight exposure along the horizon as daily rituals that support brain health and circadian alignment.