Overview of The Hidden Reason You Feel Exhausted & How to Feel Better Now
In this episode, Mel Robbins interviews gastroenterologist and researcher Dr. Brennan Spiegel about a provocative framework: many common problems — including exhaustion, GI issues, IBS, back pain, dizziness, swelling, anxiety, depression, and fatigue — may be connected to how well your body manages gravity. Dr. Spiegel argues that “gravity intolerance” can show up across multiple body systems and that simple changes in posture, movement, breathing, sleep, hydration, and strength can help you feel better and function better.
Key Idea: “Gravity Intolerance”
Dr. Spiegel’s central thesis is that the human body is constantly working against gravity, and when that system starts to break down, symptoms can appear in many different forms.
What he means by gravity intolerance
- The body is designed to stand up, stay up, and move against gravity
- Modern life can weaken that system through:
- sedentary behavior
- poor posture
- excess weight
- stress and anxiety
- depression
- ultra-processed foods
- lack of hydration
- weakness and poor balance
Symptoms he says may point to gravity intolerance
- low back pain
- bloating, constipation, IBS, stomach pain
- dizziness or lightheadedness when standing
- swelling, especially in the legs/ankles
- exhaustion
- feeling mentally “down”
- anxiety and a feeling of “falling” or instability
How Gravity Connects to the Gut
A major part of the conversation focused on digestion and why a gastroenterologist would care about gravity.
Gut, serotonin, and posture
- Dr. Spiegel explains that about 95% of the body’s serotonin is made in the gut
- Serotonin helps support:
- muscle tone
- circulation
- lymph movement
- overall physical “uprightness”
- He frames serotonin as a kind of gravity-management chemical
Why posture matters for digestion
- Slouching compresses the abdomen and chest
- Sitting all day can “kink” the digestive system, like a garden hose
- Better posture can help the gut and internal organs function more comfortably
IBS and movement
- He says exercise is one of the most effective therapies for IBS
- Activities mentioned:
- yoga
- tai chi
- strength training
- swimming
- running
- osteopathic movement-based approaches
Practical Ways to Improve Your Relationship with Gravity
Dr. Spiegel shared several simple tools listeners can try immediately.
1. Improve posture
- Don’t over-correct into stiffness
- Aim to be a little more upright and aware of your shoulders, chest, and spine
- Think of posture as organ support, not just appearance
2. Stand on one leg
- A quick self-check for balance and gravity tolerance
- He suggests aiming for at least 10 seconds per leg
- This reflects strength, balance, vestibular function, and proprioception
3. Try a dead hang
- Hang from a pull-up bar with feet off the ground
- Benefits:
- decompresses the spine
- improves grip strength
- challenges the shoulders
- His goal: build toward 1 minute
4. Use a weighted vest
- Dr. Spiegel says he wears one regularly
- The idea is to train your body as if gravity were stronger
- He also mentioned ankle weights and balance boards as passive ways to build strength
5. Practice breathing for grounding
- Slow, deep breathing can help shift the nervous system
- He recommends:
- sit up
- breathe down and in
- then up and out
- Even 1–2 minutes can help reduce stress and restore a sense of stability
6. Hydrate well
- He emphasized drinking enough water, roughly 10–13 glasses a day depending on the person
- Hydration supports blood flow, lymph movement, and energy levels
7. Prioritize sleep
- When you lie down, you get a “gravity break”
- Sleep supports brain cleanup and recovery
- He connected poor sleep with fatigue and possible cognitive decline risk
8. Eat serotonin-supportive foods
He described his “Stack 10” approach: a weekly rotation of tryptophan-rich foods that help the body produce serotonin.
Examples he mentioned:
- salmon
- turkey
- avocado
- chicken
- chickpeas
- kidney beans
- tempeh
- tofu
- eggs
- nuts
Notable Concepts and Analogies
Dr. Spiegel used a few memorable ideas to make the science stick:
Tensegrity
- The body is like a structure that must bend without breaking
- Back, gut, posture, and internal organs are all connected in a dynamic system
“Up” vs. “down” in language and emotion
- He pointed out that humans associate up with good feelings:
- “high”
- “uplifted”
- “glorious”
- And down with negative states:
- “down in the dumps”
- depression
- heaviness
Gut feelings as survival signals
- He linked “gut feelings” to the body sensing danger, instability, or falling
- He even described roller coasters as a kind of simulated falling response
Who This Episode Is For
This conversation is especially relevant for people who:
- feel chronically exhausted
- have digestive issues or IBS
- struggle with back pain or poor posture
- feel dizzy, weak, or off-balance
- want a new lens for understanding anxiety, depression, or low energy
- need motivation to move, stand, stretch, and strengthen their bodies
Bottom Line
Dr. Spiegel’s message is that your symptoms may not be random — they may be signs that your body is struggling to manage gravity. His solution is not complicated or extreme: stand taller, move more, strengthen your body, breathe deeply, hydrate, sleep well, and give your system better support.
The overall takeaway: you may not be “broken” — you may just need to improve your relationship with the planet you live on.
Action Items from the Episode
- Try standing on one leg for 10 seconds per side
- Practice a 1–2 minute breathing reset
- Spend less time slouched over a phone or desk
- Add strength training, yoga, or balance work
- Consider a dead hang challenge
- Improve sleep and hydration
- Include tryptophan-rich foods regularly
- If symptoms are persistent, use this framework as a conversation starter with a doctor