The Diary of a CEODr. Stacy Sims: Why women need different training rules
Sports scientist Stacy Sims explains why male-data fitness backfires; cycle-aware fueling, heavier resistance work, and creatine carry women through menopause.
CHAPTERS
- 0:00 – 23:30
Why Women Aren’t Just Smaller Men in Sports Science
Sims explains how nearly all existing exercise and nutrition protocols are based on male participants, and how that skews both guidelines and outcomes for women. She shares the formative experiences that revealed this bias to her and led to a career focused on sex differences in physiology.
- 23:30 – 41:00
Dr. Stacy Sims’ Background and Research Focus
Sims outlines her academic and athletic CV, from competitive endurance sport to research at Springfield, AUT, and Stanford. She describes how questions from her own racing and teammates shaped her studies on heat, hydration, menstrual phases, and contraceptives.
- 41:00 – 59:00
Core Physiological Sex Differences: Muscle, Fat, Heart, Lungs, Q‑Angle
The conversation dives into the biological differences between male and female bodies that shape performance and injury risk. Sims covers in‑utero differences, puberty changes, muscle-fiber types, fat distribution, and structural aspects like Q‑angle that influence movement.
- 59:00 – 1:22:00
Q‑Angle, ACL Injuries, and How Women Should Train to Stay Safe
Sims explains why women suffer ACL injuries at rates 3–4 times higher than men and what can actually be done to prevent them. She connects structure (Q‑angle), neuromuscular patterns (quad dominance), and inadequate grassroots coaching to this injury epidemic.
- 1:22:00 – 1:46:00
Male vs Female Metabolism: Why Calories-In-Calories-Out Fails Women
The discussion shifts to metabolic sex differences, focusing on the hypothalamus, kisspeptin neurons, and energy availability. Sims explains why popular regimes like fasted training, intermittent fasting, and low-carb diets often work for men but backfire for women.
- 1:46:00 – 2:21:00
Fasting, Keto, Autophagy, and Exercise as a Stronger Longevity Lever
Sims critiques the blanket promotion of intermittent fasting, warrior fasting, and ketogenic diets for women. She contrasts male and female responses and emphasizes that exercise itself is a more robust and safer driver of autophagy and longevity.
- 2:21:00 – 2:53:00
Creatine, Vitamin D, Iron, Omega‑3: What Women Actually Need
The conversation turns practical with supplements. Sims debunks myths around creatine ‘bulking’ women, highlights vitamin D’s systemic importance, clarifies iron deficiency norms, and explains when Omega‑3 is useful.
- 2:53:00 – 3:36:00
Sleep, Jet Lag, and Chronobiology Differences Between Men and Women
Sims unpacks how men and women differ in circadian timing, sleep architecture, and responses to jet lag. She connects these differences to hormone pulses, appetite regulation, and practical strategies for eating and sleeping.
- 3:36:00 – 4:46:00
Perimenopause and Menopause: Reverse Puberty, Not a Personal Failure
This section focuses on perimenopause as a multi-year, system-wide hormonal transition that many women mistake for personal burnout or depression. Sims reframes it as reverse puberty, outlines its metabolic consequences, and clarifies the role of menopause hormone therapy.
- 4:46:00 – 5:00:00
PCOS, Endometriosis, and Using Training & Environment as Therapy
Sims briefly addresses how conditions like PCOS and endometriosis change the training and recovery picture. She notes emerging perspectives on endometriosis and how high-intensity work can help counter insulin resistance in PCOS.
- 5:00:00
Cycle Literacy, Tracking, and Why Men Must Join the Conversation
The episode closes with a call for menstrual and menopause literacy for everyone, not just women. Sims and Bartlett reflect on how little is taught in schools and how understanding female physiology improves relationships, coaching, and healthcare.
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