The Vagus Nerve: An Emerging Key Player in Health

“How long do you have?” is Professor Owen Epstein’s playful reply when I ask about the vagus nerve’s functions. He’s a leading gastroenterologist, particularly focused on the vagus nerve’s impact on gastrointestinal health.

Much like fashion, certain areas of physiology trend based on breakthroughs in medical understanding. Consider the gut microbiome—it rapidly transitioned from an obscure term to a trendy buzzword, capturing attention from both experts and everyday folks.

Now, the vagus nerve is stepping into the spotlight. It may be new to some, but trust me, once you know about it, you’ll start seeing references pop up everywhere. It’s only been over the last decade that people have begun seriously recognizing its vital role, with interest lately reaching a noticeable high.

While there’s still a lot to learn, the vagus nerve serves as the body’s internal communication backbone. It connects nearly all our internal organs to the brain, acting like an internal radar system monitoring bodily conditions. While our senses keep watch for external perils, the vagus nerve monitors our internal landscape.

“It’s now widely accepted that it provides consciousness with crucial information about our internal organs,” explains Professor Epstein. “By delivering this information beautifully and precisely to the brain, it orchestrates communication among organs to ensure stability and wellbeing.”

The vagus nerve constantly tunes our organs, as Epstein puts it—a conductor for our internal symphony. For example, it signals whether we’re hungry, full, need the restroom, or feel bloated, and similar processes happen throughout our organs.

Interestingly, the vagus nerve is actually two nerves—one on each side of the body, made up of around 100,000 nerve fibers each. “In reality, you don’t just have one vagus nerve; you have 200,000,” says Dr. Kevin Tracey, a neurosurgeon and author of an upcoming book on the subject. Each of those fibers has specific roles and destinations, refined over millions of years of evolution.

Dr. Tracey’s interest in the vagus nerve began unexpectedly during his research on inflammation in the 1990s. His team discovered that an anti-inflammatory molecule used in animals’ brains also affected inflammation throughout their bodies, which was quite surprising. “We realized the vagus nerve was the bridge connecting brain and body,” he adds.

This connection holds immense potential for health outcomes, leading to innovations in what’s called “bioelectric medicine.” This includes vagus nerve stimulation with devices that can “reboot” the system, much like restarting a computer.

Clinical trials have yielded promising results for conditions from epilepsy to Crohn’s disease using this technique. However, while some studies suggest its effectiveness in alleviating depression, it only works in about half of the cases—a mystery still unsolved.

Dr. Tracey’s team has developed a small device designed to treat rheumatoid arthritis through vagus nerve stimulation, receiving FDA approval recently. Other devices, like non-invasive wearables, also target the vagus nerve but with varying approaches.

This nerve plays a crucial role in immune system regulation. Blocking or cutting the vagus can trigger inappropriate immune responses. Some experts speculate that autoimmune disorders could be related to a dysfunctional vagus nerve.

Professor Epstein suggests this could also relate to conditions like long Covid or post-viral fatigue. Typically, when people present health issues, doctors check for “hardware” problems through imaging. But if results are normal, it often points to a “software” issue with the communication pathways in the body.

This concept connects to PTSD and chronic anxiety, reflecting the broader “polyvagal theory” developed by psychologist Stephen Porges. He posits that our nervous systems alternate between three states: “fight or flight,” which is our immediate response to danger; “immobilization,” feeling overwhelmed and unable to act; and “social engagement,” when we feel connected and safe.

Movement between these states isn’t something we can easily control. For those who have experienced trauma, being “stuck” in a reactive phase can lead to numbness or dissociation.

However, alongside genuine medical advancements, there’s an abundance of misinformation surrounding the vagus nerve in the wellness sphere, especially on social media. Every other post seems to promise miraculous effects from vague DIY treatments or unverified devices.

Dr. Tracey highlights that while unproven methods won’t typically present health risks, conflating them with robust scientific research can lead to wider skepticism. “When misinformation spreads, it can erode trust in actual findings,” he cautions.

In some instances, unaffiliated practitioners are using legitimate technologies without the necessary knowledge, essentially applying treatments indiscriminately. “Vagus nerve stimulation isn’t a universal solution,” warns Epstein. It shouldn’t be utilized without proper evaluation.

Even more concerning are unverified devices claiming to stimulate the vagus nerve through questionable methods, often lacking scientific backing and rigorous testing. Some companies market these devices with inflated claims based on studies that aren’t properly reviewed or replicated.

It’s reasonable to wonder if techniques like deep breathing or yoga genuinely “wake up” the vagus nerve. “People aren’t necessarily being deceitful,” Dr. Tracey acknowledges, “but they might be misinterpreting the data or driven by profit.”

The silver lining? Trying out these novel therapies hasn’t proven harmful, but there is concern that mixing real advancement with flimsy claims undermines serious science.

Ultimately, it’s important to discern between eyebrow-raising fads and scientifically validated treatments. Because when buzzwords overshadow genuine breakthroughs, we all end up losing faith in what’s possible.