Where Stress and Blood Sugar Fit In
Two hormones this guide doesn't cover in full — and why they still matter here
Cortisol and insulin both interact with the hormones covered throughout this guide, even though neither gets full treatment here. Chronically elevated cortisol — the primary stress hormone, released via the HPA axis (Section 1) — suppresses testosterone and disrupts sleep, which itself affects nearly every hormone in this guide; it can also disrupt the menstrual cycle. Insulin resistance is a central driver of PCOS and can likewise disrupt the menstrual cycle, and elevated insulin interacts with testosterone and SHBG in men.
Full mechanistic and practical depth on cortisol — the stress cascade and the breathing-based tools with genuine trial evidence for managing it — lives in the Stress, Breathing & the Nervous System guide. Full depth on insulin, including how it's tested, lives in the Heart & Metabolic Health guide.
Section takeaway
Cortisol and insulin aren't peripheral to the hormones covered in this guide — they actively suppress and interact with the reproductive axis, which is why managing stress and blood sugar is, among other things, a hormonal intervention.