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Why Thomas Delauer Quit Intermittent Fasting & Stopped Skipping Breakfast — Key Takeaways

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Why Thomas Delauer Quit Intermittent Fasting & Stopped Skipping Breakfast

Jay Feldman Wellness18mOct 1, 2026

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Daily 16:8 fasting elevates morning cortisol and can flatten your circadian cortisol rhythm over time, so use intermittent fasting as a short-term tool rather than a daily long-term habit.

Key takeaways

Daily 16:8 fasting flattens circadian cortisol rhythm over years

Daily 16:8 fasting flattens circadian cortisol rhythm over years

  • Skipping breakfast prevents the food signal that lowers cortisol, keeping it elevated via gluconeogenesis
  • Chronic morning stress response trains the body into a sustained stressed state

Fasting elevates cortisol within days, not years

Fasting elevates cortisol within days, not years

  • Studies cited show cortisol shifts after just a few days of intermittent fasting, not only after years
  • Downstream negative effects appear within weeks, contradicting the 'only over years' framing

Morning carbs and protein lower cortisol via insulin

Morning carbs and protein lower cortisol via insulin

  • Eating signals HPA axis that resources are available, letting cortisol decline
  • Carbs are especially effective because they stimulate insulin, which opposes cortisol

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In this video

  1. 1mThomas Delauer admits that intermittent fasting increases cortisol
  2. 7mwhat fasting does to your digestion, thyroid, hormones, and metabolism
  3. 13mwhy intermittent fasting is stressful and increases cortisol

“You're essentially training your body to wake up in a slightly stressed state day after day after day.”

— Thomas DeLauer

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