The Mel Robbins Podcast

The Hidden Reason You Feel Exhausted & How to Feel Better Now

269 snips
Jun 8, 2026
Dr. Brennan Spiegel, gastroenterologist and researcher who wrote Pull, explores how gravity shapes gut health, posture, balance, and aging. He discusses gravity intolerance, quick posture and balance checks, foods that boost serotonin, and simple strength and hydration habits to better manage gravity. Short, practical strategies to feel lighter, steadier, and more energized.
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ANECDOTE

Family Experience Sparked Gravity Research

  • Spiegel's mother-in-law developed cognitive and digestive decline after lying in bed, inspiring his research into gravity's health effects.
  • He observed that getting her up and walking improved symptoms and led him to write the paper 'Gravity in the Gut.'
INSIGHT

Most Serotonin Comes From The Gut Not The Brain

  • About 95% of the body's serotonin is produced in the gut, not the brain, and it powers muscles, lymph flow, and blood pressure regulation.
  • Spiegel frames serotonin as a core 'gravity management' substance supplied by the microbiome and diet.
INSIGHT

Gut Feelings Act Like A G-Force Sensor

  • Gut 'butterflies' and rollercoaster distress illustrate the gut as a G-force accelerometer that signals perceived falling or threat.
  • Spiegel links IBS patients' aversion to rollercoasters to exaggerated visceral fear of falling and miscalibrated gut signals.
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