All articles tagged with #vagus nerve
A US study published in Nature Communications suggests that signals from the digestive system, carried by the vagus nerve, can influence memory formation in rats, linking dietary choices to how the brain encodes memories.
A USC-led rat study shows a nutritious meal triggers a gut-to-brain signal via the vagus nerve that boosts acetylcholine release in the medial septum and hippocampus, strengthening memory-related brain activity; fats and sugars intensified the effect while a Western junk-food diet early in life weakened it. The effect depends on intact vagal afferents and septal acetylcholine neurons, and may not translate directly to humans, but points to gut-brain targets and vagus nerve stimulation as potential therapies—though further research is needed and the study used male rats only.
A rat study shows the vagus nerve senses gut state during eating and triggers acetylcholine release in the brain, supporting attention and memory; disrupting this pathway impairs cognitive signaling, and a Western-style high-fat/high-sugar diet may further weaken it, offering clues about diet-related cognitive decline and aging-related diseases like dementia.
Stanford researchers show age-related memory loss in mice can be driven by gut microbiome changes that weaken signals along the vagus nerve to the hippocampus; by modifying gut bacteria or stimulating the vagus nerve, old mice regained memory performance, suggesting peripheral gut-brain interventions could help human cognitive aging.
A new procedure called cardioneuroablation targets the heart’s vagus nerve pathways to reduce pauses in beating that cause fainting in cardioinhibitory syncope. Early results presented at a cardiovascular conference show 25 patients had markedly fewer fainting episodes (averaging under one per year) after treatment, with the broader series reaching 52 patients overall. While promising, the approach is still being studied, not yet peer‑reviewed, and longer-term durability remains to be established, especially as an alternative to pacemakers.
A 1985 death of a baby in the hands of neurosurgeon Kevin Tracey propelled him to study inflammation, culminating in the FDA-approved SetPoint System—a small neck implant that stimulates the vagus nerve for one minute daily to dampen inflammation in rheumatoid arthritis patients, offering dramatic relief for many while facing ongoing insurance denials; Tracey sees this as the dawn of bioelectronic medicine and a potential path to other inflammatory diseases.
A baby’s death in the arms of a young neurosurgeon in 1985 propelled Dr. Kevin Tracey to devote his career to understanding inflammation. His decades of research culminated in the FDA’s 2025 approval of the SetPoint System, a tiny implanted device that stimulates the vagus nerve to dampen inflammation in rheumatoid arthritis, with hopes it could treat other inflammatory diseases—an achievement born from a napkin sketch and a tragedy that reshaped medical science about inflammation.
The vagus nerve is a vast brain–body network that helps regulate heart rate, breathing, digestion and inflammation; higher vagal tone is linked to better well-being, while low tone is associated with chronic stress and disease. Implanted or noninvasive vagus nerve stimulation can help certain conditions, but at‑home devices and hype lack robust proof. Realistic ways to improve vagal tone include regular exercise, slow nasal diaphragmatic breathing, mindfulness meditation, and, to a lesser extent, cold exposure—though none replace medical care or a healthy lifestyle.
A new line of chronic-pain research points to a brain region, the caudal granular insular cortex, and the vagus nerve as key players in whether pain fades after an injury or becomes long-lasting; blocking the pathway early in animals prevents chronic pain, while later intervention can ease established pain. The work emphasizes that pain is not just tissue damage but an active nervous-system state influenced by brain circuits, inflammation, and interoceptive signaling, with taVNS emerging as a potential tool in specific clinical contexts—but findings are preliminary and condition-specific.
A 29-year-old man with atrial fibrillation experienced a racing heartbeat at hospital admission. A routine digital rectal exam, combined with a Valsalva maneuver, is thought to have stimulated the vagus nerve and slowed his heart rate to about 80 bpm, with the irregular rhythm resolving and not returning months later. Standard AFib treatments typically involve medications or electrical cardioversion; this rectal-exam approach is not established therapy and requires more research. The patient was also prescribed an anticoagulant to prevent clots.
A 29-year-old man in Queens developed sudden atrial fibrillation with a heart rate around 140 bpm. After admission, doctors planned cardioversion but first performed a digital rectal exam to check for GI bleeding before anticoagulation. During the exam, his heart rate slowed to 80 bpm and the AFib rhythm resolved to normal sinus rhythm; Palpitations subsided and he was discharged, with no recurrence at a 3‑month follow-up. The report suggests the rectal exam may have stimulated the vagus nerve via the Valsalva maneuver, increasing parasympathetic activity and slowing heart conduction, potentially counteracting the arrhythmia. Researchers caution it should not replace standard AFib treatments and call for more study to validate this approach.
When a conflict triggers the nervous system, rational thinking often shuts down. The article outlines six quick, body-first strategies to shift from reactivity to regulation: take a small step back to create distance; perform a horse flutter breath to release facial tension and interrupt escalation; shake out the body to discharge stress energy; emit a long, audible sigh to activate the parasympathetic system; use a butterfly hug with bilateral tapping to calm the amygdala; and look around (orienting) to reestablish safety. The goal is to create space between stimulus and response so you can choose a thoughtful, not reflexive, reply.
A Nature study shows aging gut microbiomes produce molecules that blunt gut-brain signaling via the vagus nerve, contributing to memory decline in mice. When older microbiomes were transferred to young mice, memory worsened, but antibiotics or a targeted phage against Parabacteroides_goldsteinii restored function. Direct vagus nerve stimulation through gut hormones also reversed memory deficits in old mice, suggesting that age-related memory loss may be driven by body-wide signals and could be reversible with existing or developing therapies, though human applicability remains to be determined.
Emory researchers in mouse models of leaky gut and disease show very small numbers of live gut bacteria can reach the brain, with evidence that the vagus nerve serves as the main route; blocking the nerve reduced brain bacterial presence, suggesting a gut-to-brain transmission axis influenced by diet and genetics and potentially reversible by restoring gut integrity. The findings, published in PLOS Biology, are not yet known to occur in humans and the bacteria were present in very low amounts, leaving open questions about their role in inflammation or disease and whether future gut-targeted therapies could affect brain conditions.
A study from Emory University in mice shows that a high-fat Western-style diet increases gut permeability, allowing live gut bacteria to travel through the vagus nerve into the brain, which could help explain links between diet and neurological conditions; the movement was tracked using an engineered barcoded bacterium, occurred without bacteria appearing in the blood, and returning to a normal diet reduced brain bacterial load, suggesting reversibility.