The GutFit Nutrition Podcast · Leigh Merotto, Dietitian | IBS, Gut Health and Fitness Expert

35: Cortisol, Burnout and Adrenal Fatigue— What's Really Happening? Sifting Myth from Fact

·1 hr 5 min·4 clips

Krista says thyroid function can slow down long before labs show anything.

1. The GutFit Nutrition Podcast episode centers on cortisol, burnout, and “adrenal fatigue” with Lee Murado and Krista Bigler. 2. Lee Murado is the host and registered dietitian, and Krista Bigler is a private-practice clinician with more than 10 years in practice. 3. The episode asks how to sift myth from fact in stress, burnout, and hormone function. 4. Krista says her own 2017-2018 health crisis came after working at an intermittent fasting program. 5. She describes “trash[ing] my adrenals and thyroid” and links it to undernourishment and slowed hormone production. 6. Krista says she started the podcast The Less Stressed Life in 2017 because she wanted a synonym for inflammation. 7. Lee describes her own shift away from six-hour sleep, six-day training, and side jobs during university and master’s years. 8. She says boundaries now matter because she does not want to return to that burned-out place. 9. Krista defines burnout as a mismatch between daily life and how someone wants to live. 10. She uses Gay Hendricks’ The Big Leap and the contrast between “zone of genius” and “zone of excellence” to make that mismatch concrete. 11. Krista also frames burnout as a bank-account problem, where withdrawals outpace deposits. 12. She says even work you love can drain you, and she needs quiet after talking to people all day. 13. Krista describes talking fast as a stress response that raised her heart rate and cortisol. 14. She says boundaries often appear only after friction forces a new decision. 15. Krista says cortisol is not bad or good and that people without cortisol are dead. 16. She says cortisol should rise after waking, decline in the afternoon, and be lowest at night. 17. Krista connects afternoon crashes, late-night alertness, and “wired and tired” patterns to that rhythm. 18. She says cortisol can dump potassium and magnesium, while standard blood work may miss those shifts. 19. Krista argues that thyroid function can slow before lab results change, and that TSH is a pituitary alarm signal rather than a thyroid hormone. 20. She says people interested in symptom-based screening, light hygiene, and stress physiology would get the most from this episode, while listeners wanting a quick lab-only explanation may skip it.

As heard by us

A careful look at thyroid, cortisol, DHEA, and the limits of testing when symptoms do not match the labs.

The episode draws a clear line between symptoms and lab results, arguing that thyroid function can slow down well before it shows up on blood work.

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Why you'd press play

When your labs look normal but your body still feels wrong.

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