The Giants Shoulder #113 - Meet The Neuroscientist Decoding Your Bodies Cannabis System
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Apr 22, 2026 Dr. Matt Hill, cannabis neuroscientist and former International Cannabinoid Research Society president, unpacks how the endocannabinoid system shapes brain and body. He explains why people react so differently to cannabis. He covers retrograde signalling, dose-dependent calming versus anxiety, sex differences in THC metabolism, the research setbacks from Canadian legalization, and why precision clinical trials remain elusive.
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Low Dose Calms, High Dose Causes Paranoia
- Dose-dependent effects explain opposing anxiety outcomes: low THC calms excitatory-driven amygdala activity, high THC blocks inhibitory neurons and increases amygdala activity.
- Narrow titration windows with modern potent cannabis make accidental overconsumption common.
Women Produce More Potent THC Metabolite
- Women metabolise more THC into the potent 11-hydroxy-THC via liver enzymes, making them more sensitive to the effects and adverse outcomes.
- Edibles especially increase 11-hydroxy production, contributing to stronger responses in females.
We Can’t Map CB1 For Personalised Prescriptions
- Mapping individual CB1 receptor distribution in living humans would require PET scans, which are costly, radioactive, and impractical at scale.
- Without large funded PET studies, personalised neuroscience-guided cannabis matching is currently infeasible.