• Introduction
• The Vortex of the Heart
• The Ventricles and CSF
• Vagal Tone and the Aorta
• The Vagus Nerve, Kidney, and Urine
• Breathing, Sweating, and Mastication
• Music and Vibrations
• Conclusion
• References

§Introduction

  When writing my first book which centered around the health implications of meditation, there was one nerve that constantly appeared in the literature: the vagus nerve. The vagus nerve is the tenth cranial nerve and the longest in the body. It begins in the brain and extends all the way down into the abdomen, innervating with major organs such as the heart, lungs, and various organs of the digestive track. It is the dominant nerve of the parasympathetic nervous system, which is why it is a focus in meditation research. When vagus nerve activity goes up due to these practices, it suggests that meditation is a way of bringing our bodies back into balance and away from our “fight or flight” system (the sympathetic nervous system). Increasing the activity of this nerve is often seen as crucial for our mental, physical, and spiritual health.  

§The Vortex of the Heart

  Following the line of inquiry from my previous articles, it is interesting to consider how the anatomy of our body is optimized to separate light protium-rich water from heavy deuterium-rich water for the purpose of our metabolic health. Our mitochondria prefer light water, as the protium is more thermodynamically efficient in the electron transport chain. However, consuming water containing deuterium is a natural consequence of living in our world, so the body is structured in a way to filter it out. For example, this may very well be the function of the heart. Spinning fluid is well known to separate heavy isotopes from the light ones (Wild et al. 2023). Furthermore, research beginning in 1972 had already begun to recognize that the heart forms a vortex of blood when it pumps, and later research found that this increases the efficiency of the bloods movement (Bellhouse 1972; Martínez-Legazpi et al. 2014). The health of this vortex has also been found to be correlated with both cardiac function and health (Kheradvar et al. 2019; Hong et al. 2008). While traditional perspectives view the heart as a pump, it may indeed be an organ that forms a vortex to separate the light water from the heavy water so that mainly light water is pumped up into the brain.  

§The Ventricles and CSF

  The heart may not be the only location where this water separation occurs. The neurons of the brain have a heavy concentration of mitochondria. While less than 2% of total body mass, the brain accounts for 20% of our metabolic activity and 1 neuron is estimated to have 1-2 million mitochondria (Misgeld and Schwarz 2017; Duarte, Ciampi, and Duarte 2023). The brain lacks a traditional lymphatic system, which is what the body uses to remove and drain cellular and metabolic waste from our cells. Instead, our brain uses cerebral spinal fluid (CSF), which is a specialized system that is refreshing the fluid surrounding the neurons with fresh water and draining away waste products through glymphatic pathways (Iliff et al. 2012). It is akin to the oil in a car: to keep the engines running efficiently, the old oil needs to be frequently replaced with fresh oil. The quality of the water surrounding our neurons, and therefore the quality of our CSF is vital to metabolic function. The lighter the fluid, the more efficiently the engines inside our neurons function. It is then interesting to consider how our anatomy is structured in a way to optimize the quality of CSF that arrives to the brain. CSF is produced by the choroid plexus and flows from the lateral ventricles through the interventricular foramina to the third ventricle, then passes through the cerebral aqueduct (a.k.a the Aqueduct of Sylvius) into the fourth ventricle (Lun, Monuki, and Lehtinen 2015). From there, it enters the subarachnoid space surrounding the brain and spinal cord, where it is eventually is resorbed by arachnoid granulations back into the superior sagittal sinus and systemic venous circulation. CSF mainly enter the blood via arachnoid villi, and this is done through pressure dependent flow (Laterra et al. 1999).

The physical structure of the cerebral aqueduct is worth noting. This corridor between the third and fourth ventricle is very narrow. The narrower the aqueduct, the higher the velocity will the fluid move given the same amount of pressure (Jacobson et al. 1999). Cerebrospinal fluid pulses back and forth through the brain’s narrow canal, shooting out in a quick burst into the fourth ventricle whenever it flows forward (Sincomb et al. 2020). Given the viscosity difference between light and heavy water, this high-velocity movement may separate the two forms of water: pushing the protium water further into the ventricle and pushing the heavier water to the sides.   This is where the vagus nerve may begin to play a role in the regulation of our body’s water quality. The core hypothesis here is that the vagus nerve plays a role in the regulation of water quality throughout the body. It is already well established that the area postrema, which was initially viewed as a brain region that triggered vomiting, is also monitoring chemical signals in the blood and integrating these circulating cues with sensory information transmitted via the vagus nerve to coordinate systemic autonomic responses and maintain physiological homeostasis (Price, Hoyda, and Ferguson 2008; Adachi et al. 1991).

          As illustrated in the above image, the area postrema sits right adjacent to the vagal trigone (a.k.a ala cinerea) which has anatomically been shown to be a surface region sitting at the floor of the fourth ventricle, suggesting that the ventricle floor serves as an anatomical landmark for vagal related brainstem control centers (Emmi et al. 2021). These anatomical relationships give rise to the hypothesis that the vagus nerve could be detecting the quality of CSF fluid interacting with our brains once it is squeezed through the aqueduct. Furthermore, there is a large body of research showing that the vagus nerve, alongside other cranial nerves, are in certain regions surrounded by CSF fluid (Fahmy et al. 2021; Falkenberg-Jensen et al. 2025). This not only suggests that the vagus nerve is detecting and reacting to the isotopic quality of the CSF water, but this may also provide insight into the meaning behind vagal tone.  

§Vagal Tone and the Aorta

  Vagal tone is a measurement of vagus nerve activity and is often used as a measurement of parasympathetic nervous system activity and overall health. The quality of water surrounding neurons influences the availability of protium that can be utilized for metabolic activity. The lighter the water surrounding the neurons, the more neuronal activity that can be expected. Vagal tone could then reflect the isotopic quality of the water surrounding it. If the vagus nerve is receiving positive signals and is surrounded by high quality light water, then this would indicate that the separation mechanism in the aqueduct is working well and CSF movement should be promoted. This is in alignment with scientific observations that vagus nerve stimulation can enhance CSF influx and CSF penetrance within the brain (Cheng et al. 2022; Choi et al. 2025). Furthermore, the detection of water quality affecting vagal tone will play a role in cardiovascular and respiratory activity.   For the sake of this article, the path the vagus nerve walks will be used as a guide to how the body is interconnected to handle the deuterium in our water. As the vagus nerve descends down the neck, it branches into the left recurrent laryngeal nerve (RLN) and loops under the aortic arch (Ghosh and Chaudhury 2019).

            This anatomical structure may serve the purpose of coordinating synchrony between the water separation processes in both areas. It is already well established that the pulsated rhythm of CSF flow is synchronized with cardiovascular and respiratory rhythms (Vinje et al. 2019; Mestre et al. 2018; Bergstrand et al. 1986). This may be mediated by the RLN in terms of heart synchronicity. When the heart pumps, the aorta moves and mechanically tugs on the nerve. Neurons can be surrounded by satellite glial cells, and glial cells in peripheral nerves have been shown to possess mechanosensitive ion channels that can modulate neuronal activity (Brandt and Smith 2023). Furthermore, it has been shown that the RLN sends afferent sensory up to the central nervous system for the regulation of the pharynx, larynx, trachea, esophagus (O’Flynn, Worthley, and Simonyan 2020). It is not difficult to further extrapolate that further signals can be sent higher. Vagus nerve stimulation has already been shown to influence CSF flow (Cheng et al. 2022).Therefore, it is possible that the mechanical tug of the RLN that wraps under the aorta is helping synchronize the flow between the heart and CSF. During the movement of CSF flow through the cerebral aqueduct, the pulsating rhythm of the fluid flow is vital towards the quality of fluid separation. When there is abnormal flow, there is an increase in CSF mixing (Maeda et al. 2025). When this happens, the aqueduct is not efficiently separating the isotopic water types, and the brain will be provided heavier water. Accordingly, this vast coordination between the heart, vagus nerve, and ventricles may all serve the purpose of optimizing a coherent rhythm of fluid flow to efficiency separate protium from deuterium.  

§The Vagus Nerve, Kidney, and Urine

  Consider how this coordination may expand throughout the vagus nerve. The vagus nerve plays a critical role in regulating kidney function, and defective vagal signaling can accelerate the progression to kidney failure (Morgunov and Baines 1985; Salman, Hildreth, and Phillips 2017). Furthermore, cardiovascular autonomic dysfunction caused by vagal impairment has been shown to be a strong predictor of the future development of chronic kidney disease (Yun et al. 2015). Perhaps the functions of the heart are strongly correlated to the functions of the kidney, and it is centered around the function the vagus nerve plays in regulating the isotopic quality of our water. Consider how the anatomical processes discussed above would lead to more deuterium in the blood and preferentially favors more protium being provided to the cells of the body with mitochondria. Indeed, experimental research has found that blood plasma has higher deuterium levels than visceral organs and breast milk (Basov et al. 2019). Red blood cells are also one of the few examples of cells in our bodies that do not have mitochondria of their own. The vagus nerve may be coordinating with the kidneys, in part, because it is the location where the deuterium is filtered out and removed from the body via urine.  

§Breathing, Sweating, and Mastication

  The body likely has many more biophysical processes that assist in the separation, filtration, and removal of deuterium from our bodies. Consider for a moment breathing, which influences intracranial pressure dynamics and has been shown to be a major driver of CSF flow (Delaidelli and Moiraghi 2017). Our bodies are constantly breathing, and this may also be contributing to the separation occurring in the ventricles. Furthermore, consider the breathing practices of meditation, Tai Chi, Qi Gong, and other such practices and how these may be practices may be promoting deuterium processing. There is also evidence to suggest that sweating serves as a pathway for the elimination of ingested deuterium-enriched water from the body (Armstrong et al. 2010; Church, Lee, and Buono 2017).   Our bodies are always moving, breathing, and vibrating, and much of this may be causing physical motion that help separate this heavier water from the lighter water and to ensure that the heavy water moves along the excretion path and does not stall. Consider then the role mastication may have on our deuterium removal process. Below is an image of the trigeminal cave (a.k.a Meckel’s cave), which houses the trigeminal nerve (CN V).

 Here is a mirror image view of this area of the head, to provide some idea of where the trigeminal nerve extends across the head and jaw.

 Arachnoid granulations are present in the trigeminal cave and this suggests that CSF drains here into the venous system as well (Wysiadecki et al. 2023). Mastication activates periodontal mechanoreceptors in teeth, providing sensory input to trigeminal neural circuits (Grigoriadis and Trulsson 2018). While the trigeminal nerve ganglion resides in Meckel’s Cave and the vagus nerve exits via the jugular foramen, their pathways converge centrally in the medulla of the brainstem. Research has found that trigeminal nerve activity, particularly via the mandibular and maxillary branches, can induce electrical changes in the vagal nuclear area of the medulla, suggesting a mechanism by which trigeminal stimulation increases the vagus nerve activity (Sugaya et al. 1986).  

§Music and Vibrations

  In both mastication and the beating of the heart, mechanical vibrations influence neuronal activity and are suggested here to play a role in CSF flow and deuterium processing. However, this may not simply be a neuron activity situation, but the very vibrations themselves may be playing a role in the regulation process. As previously stated, our bodies are constantly in motion, and slight vibrations are constant as long as the heart beats and the lungs breathe. However, this line of thinking causes me to reflect on research I found years ago surrounding the health benefits of external vibrations. Consider how human culture developed practices that added vibrations to the body, and how this may have been to enhance our health and ability to separate light from heavy water while simultaneously carrying with it holy significance. Consider the creation of music, or the existence of church bells, or even the placement of a grand piano in a home, as potentially healing modalities from our past.   There is a scientific basis for the idea that acoustic vibrations can influence fluid movement in biological systems. Ultrasound waves are known to induce acoustic streaming and move particles within fluids (Novotny, Lenshof, and Laurell 2022). Experimental evidence also suggests that focused ultrasound can enhance the movement of cerebrospinal fluid tracers and associated solutes into brain tissue in rodents (Yoo et al. 2022). Perhaps this explains why there is extensive research that shows how music therapy increases heart rate variability and parasympathetic tone, all indicators of increase vagus nerve activity (Zhang et al. 2026; Parizek et al. 2023). The vibrations may be helping the CSF flow as intended. In other words, the vibrations help ensure heavy water does not stagnate and that it moves out of the body as it should, all ensuring that the nerves are surrounded by high quality light water that optimizes mitochondria function and neuronal activity. When moms sing (distinct from just talking) to their baby’s in the NICU, the child’s vagal tone increases (Filippa et al. 2022). There is something about the humming, the vibrations, and the music that calls to us and is helpful for the flourishing of our minds and bodies.  

§Conclusion

  There is a profound relationship between mental, physical, and spiritual health. Complex life, as we know it on this earth, centers around biological life absorbing the light from the sun and acting as dissipative structures. For our mitochondria to work efficiently, they require light protium-rich water. Our body is likely structured in a manner that optimizes the separation, filtration, and processing of the water we naturally receive from food and drink so that our cells receive the lightest water possible and that the heavy water is removed from our bodies. Prolific throughout research involving healing modalities commonly associated with more holy connotations, such as meditation and music, is the vagus nerve in our experimental obversions. These more holistic practices almost always increase vagal tone, which we commonly interpret as our body relaxing and returning to a more natural state of nervous system balance. However, what if this is a more superficial understanding of these findings? What if our body’s ability to properly handle the isotopic quality of the water, which is highly dependent and regulated by the vagus nerve, not only promotes mitochondrial health but also our alignment with the greater thermodynamic flow of energy. We are dissipative structures, and our form is one such that helps facilitate the flow of energy of the universe. When aligned with that flow, we feel more at peace, one with ourselves and the greater whole, and feel connected with something greater. Our alignment, which feels holy, is likely tied to our energetic alignment.  The more coherent and thermodynamically efficient our bodies, the more we feel one.          

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