LONGEVITY with Nathalie Niddam #417: Depression and Weight Gain In Kids & Adults | A Long Term Post-COVID Problem & How To Reverse It With Dr. Cynthia Keller
Mar 3, 2026
Dr. Cynthia Keller, a pediatrician turned integrative-functional clinician who founded Centered in Wellness, discusses post-COVID nutrient depletion and its effects on mood, energy, and unexpected weight gain. She explains patterns like tryptophan and cofactor loss, gut and microbiome disruption, practical symptom-based nutrient trials, and why longer visits, listening, and family-wide approaches speed recovery.
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Suicidal Patient Recovered Quickly With Tryptophan
- A long-term patient became suicidal after a COVID infection; tryptophan supplementation resolved her symptoms in two weeks and allowed removal of multiple meds.
- Keller used this case as the pivot to investigate nutrient depletion across patients.
Shared Cofactor Depletion Explains Mood And Energy Loss
- Three shared cofactors (BH4/methylfolate, P5P/B6, and zinc) are required for both serotonin and catecholamine synthesis and get depleted.
- Repleting methylfolate, P5P, and zinc restored joy and energy in cases resistant to medications.
COVID Can Persist In The Gut And Cause Continuous Nutrient Drain
- SARS‑CoV‑2 can persist in or interact with the gut/microbiome (bactriophage behavior and spike protein presence), causing continuous stimulation and cytokine cascades.
- This creates chronic drain on nutrients and ongoing systemic/brain inflammation.