Indeed, Seneff & Kyriakopoulos noted that having too much deuterium in ATP synthesis ends up producing some dangerous molecules called reactive oxygen species (ROS), and ROS appear to be at the center of chronic disease. I’ve spoken earlier about how ROS are connected to cancer, so let’s dive into cancer now.
The ATP synthase protein is a molecular machine that’s responsible for making our cellular energy: ATP. It uses the flow of hydrogen ions, driven by a hydrogen ion gradient, to rotate a motor that leads to ATP synthesis.
Before I get into cancer, let me remark that deuterium has a bit of a cult following, e.g., due to the work of Laszslo Boros who keeps a catalog of the deuterium content of various foods. Special language has been invented to talk about it.
For example, “deutenomics” is the broad name for the study of deuterium in the human body, and “deupletion” is a short-hand phrase for deuterium depletion. I will also remark that drinking deupleted water has shown promising success in lengthening the lifespan of people with cancer.
Cancer tries to sequester deuterium
In their 2025 research paper, Seneff and Kyriakopoulos noted that cancer actually plays an important role in restoring deuterium homeostasis to the body, during times of deuterium overload.
Cancer cells actually upregulate vacuolar-type ATPase, which is a pump that preferentially exports light protons (¹H⁺) out of the cell. The net effect is that the cytoplasm becomes relatively enriched in deuterium (D⁺) — essentially sequestering the heavy isotope inside the cancer cell.
Cancer exports deuterium-depleted nutrients
On top of that, cancer cells go a step further. They rapidly convert glucose to lactate in a process called glycolysis. Crucially, the lactate is deupleted - it preferentially contains protium rather than deuterium. The lactate is then exported from the cancer cell’s cytoplasm into the extracellular space and the bloodstream. Normal cells in the body receive this deupleted lactate and use it for efficient ATP synthesis.
Shockingly, this implies that cancer cells are providing a wonderful service to the rest of the body! Needless to say, when I read Seneff’s and Kyriakopoulos’s paper saying that cancer cells export deupleted nutrients to help the body, it was mind-blowing for me to hear! It raises deep questions about whether cancer is a disease or is the body’s defense mechanism against toxic overload.
Deuterium and gut microbes
A key observation that Seneff and collaborators made is about the relation between gut microbes and deuterium. Gut microbes, particularly certain bacteria and archaea in the colon, produce molecular hydrogen gas (H₂) during fermentation. Remarkably, this microbially generated hydrogen is dramatically depleted in deuterium — containing roughly 80% less deuterium than regular water. To put that depletion in perspective, if ordinary water contains about 155 deuterium atoms per million hydrogen atoms, the microbial H₂ gas drops to roughly 30 ppm — a reduction by a factor of about five.
Seneff proposes that this “light hydrogen” serves as a valuable resource: the microbes use it as a reducing agent to synthesize deuterium-depleted metabolites, which can then be delivered to host cells to help the host.
For example, gut microbes use the deuterium-depleted hydrogen gas to synthesize short-chain fatty acids like acetate and butyrate. Because these molecules are built using the “light” hydrogen, the resulting short-chain fatty acids are themselves significantly depleted in deuterium compared to what would be expected from ordinary metabolic processes.
These deupleted fatty acids can serve as clean fuel sources that help deliver low-deuterium protons directly to our bodies’ mitochondria, supporting more efficient ATP production.
Methylation pathways appear to play a similar protective role. When gut microbes supply deuterium-depleted one-carbon units and methyl groups through their metabolic activity, these low-deuterium methyl donors are incorporated into the body’s methylation cycle via compounds like SAMe, methionine, and choline.
As a result, the methylation process itself becomes a delivery system for deuterium-depleted protons and methyl groups that can be shuttled to mitochondria, helping maintain low deuterium levels where energy production occurs.
This is a key contribution of Seneff et al.’s
newer 2025 paper. Methylation pathways — centered around SAMe, folate, methionine, choline, serine, and glycine — aren’t just for detox and gene regulation.
According to this paper, they act as a sophisticated delivery service, shuttling deuterium-depleted protons straight to your mitochondria.
When the gut microbiome is functioning well, it appears to help supply these deupleted materials, potentially supporting more efficient ATP production in the body. When significant dysbiosis is present, this protective process may be disrupted, allowing deuterium levels to rise inside mitochondria and contributing to energy issues observed in various chronic conditions.
Additionally, in her book Toxic Legacy, Seneff has long argued that certain environmental chemicals, particularly organophosphate pesticides and glyphosate (glyphosate is technically an organophosphONate), can severely disrupt the gut microbiome.
By interfering with microbial metabolism and methylation pathways, such exposures may promote dysbiosis and impair the body’s ability to maintain low deuterium levels in mitochondria.