How to live longer: The nerve in your body that you need to look after to add years to your life

She said: "The vagus nerve is the longest cranial nerve in the body and it plays a crucial role in regulating key processes that influence health and longevity.

"As part of the parasympathetic nervous system, it acts as a communication superhighway between the brain and vital organs, including the heart, lungs, and digestive system."

She added: "The vagus nerve helps control inflammation, heart rate, digestion, and stress responses, all of which are closely tied to ageing and overall well-being."

The vagal nerve almost works as a layer of protection on our immune system - which fights against germs and diseases.

The expert said: "One of its most critical functions is reducing inflammation through the 'vagal tone,' which helps keep the immune system in balance and prevents chronic inflammation. A significant driver of age-related diseases like cardiovascular disease, arthritis, and neurodegenerative conditions.

"The vagus nerve also influences the gut-brain axis, linking gut health to mental wellbeing and cognitive function, further underscoring its importance in a longevity-focused lifestyle."

With its value in our body for longevity, supporting the vagus nerve should be a necessity.

Kathryn said: "Stimulating the vagus nerve can have profound effects on health and longevity. Practices such as deep breathing, meditation, and yoga help activate the nerve, promoting relaxation and reducing stress.

"Physical exercise, especially moderate-intensity activities, has been shown to improve vagal tone and cardiovascular health.

"A diet rich in anti-inflammatory foods, such as omega-3 fatty acids and fermented foods, supports vagus nerve function by reducing inflammation and fostering a healthy gut microbiome."

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The expert continued: "Cold exposure, such as splashing cold water on the face or cold showers, is another simple method to stimulate the vagus nerve.

"By nurturing vagal health, you can enhance resilience to stress, improve systemic balance, and support a longer, healthier life."

Supporting our vagus nerve is not the only way we can support our body and our longevity - one 102-year-old recently revealed the five ingredients she has been drinking to maintain her vitality.