The Parasympathetic Nervous System: Rest & Digest
Dr. Sten Ekberg explores why the parasympathetic nervous system (PNS) is critical for health and how chronic stress disables our internal healing mechanisms.
Channel: Dr. Sten Ekberg
Video Link: Watch on YouTube
⚖️ The Autonomic Balance
The nervous system operates on a "seesaw" principle. The Sympathetic (Fight/Flight) system always takes precedence in an emergency, meaning the Parasympathetic (Rest/Digest) can only function when the body perceives safety [00:01:12].
🚀 Key Functions of the PNS
- Digestion
- Immunity & Repair
- Reproduction
- Hydrochloric Acid: Essential for breaking down proteins.
- Peristalsis: The muscular squeezing that moves food through the gut [00:03:56].
- Absorption: An active process that requires PNS energy to pull nutrients into the bloodstream.
- Cell-Mediated Immunity: Powers white blood cells to fight infections [00:04:25].
- Anabolism: The process of building, repairing, and regenerating tissues [00:04:44].
- Growth: All physical healing happens in a parasympathetic state.
- Libido & Fertility: These are non-essential for immediate survival, so they are the first to be "shut off" during stress [00:05:11].
- Secretions: Controls all forms of lubrication and tear duct function.
⚠️ Symptoms of Poor PNS Activation
When the "Rest and Digest" system is suppressed by chronic stress, individuals may experience:
- Malnutrition: Even with a good diet, you may only absorb ~50% of nutrients like B12 or Calcium [00:06:00].
- Frequent Illness: Increased susceptibility to colds and flus during stressful periods (e.g., "Finals Week") [00:06:44].
- Slow Healing: Atrophy and "wasting" due to lack of anabolic repair.
- Circulation Issues: Consistently cold hands and feet [00:02:32].
Simple relaxation, breathing exercises, and mastering your response to stress can shift the balance. Note that for chronic conditions, it may take 3–9 months of consistent practice to "re-habituate" the nervous system [00:08:28].