Brain Health Basics
When your brain's supply of key molecules runs short, neurons are among the first to suffer. Understanding metabolites — what they are, what they do, and what happens when they run out — is central to understanding how brain health breaks down, and how to protect it.
When a supply chain fails — when the right materials stop arriving at the right place at the right time — the consequences ripple outward fast. The same is true inside your cells. Right now, thousands of simultaneous chemical reactions are running continuously in your body, breaking down nutrients, generating energy, repairing damage, and building new structures. The molecules produced and consumed in this process are called metabolites. When their supply is disrupted, neurons are among the first cells to pay the price.
A metabolite is any small molecule produced during the normal chemical activity of a cell. That definition is deliberately broad because metabolites are extraordinarily diverse in what they do. Some carry energy and others act as signals, instructing cells to grow, divide, repair, or shut down. Some regulate which genes are switched on or off at any given moment. Together, the mix of metabolites present in a cell or tissue is a precise chemical portrait of its biological state.
Glucose
The primary fuel molecule. Cells break it down to extract energy for almost everything they do.
ATP (adenosine triphosphate)
The cell's universal energy currency, produced from glucose and used to power virtually every biological process.
SAM (S-adenosylmethionine)
A one-carbon metabolite critical for gene regulation, neurotransmitter production, and cellular repair.
What makes metabolites more than just chemical intermediates is that many are active signals in their own right. The particular mix present in a cell, tissue, or bloodstream at any given moment both reflects and shapes the state of health of the whole organism. When that mix is disrupted — when key metabolites fall short or accumulate in excess — the consequences can be far-reaching.
A metabolic pathway is a sequence of chemical reactions, each producing a metabolite that feeds into the next step. Think of it as a molecular assembly line: raw materials go in one end, a series of transformations occur, and a finished product, or several, emerge at the other.
Each step in a pathway is catalysed by a specific protein called an enzyme — a molecular tool precisely shaped to drive one particular reaction. If an enzyme is missing, mutated, or overwhelmed, the pathway can stall, causing upstream metabolites to accumulate and downstream ones to run short. These blockages are the basis of many metabolic diseases.
The body runs hundreds of distinct metabolic pathways simultaneously, many of them interconnected. Some generate energy; others build structural molecules like proteins or fats; others detoxify harmful compounds or synthesise signalling molecules. Together, they constitute the metabolome — the complete set of metabolic activity happening in a cell or organism at any given moment.
The brain is one of the most metabolically active organs in the body, consuming around 20% of the body's total energy despite accounting for only 2% of its weight. Neurons depend on a continuous, reliable supply of the right metabolites to generate energy, maintain their structure, clear cellular waste, and sustain the electrical activity that underlies thought and memory.
When the metabolic supply chain breaks down — when key metabolites are undersupplied, or pathways are disrupted — neurons are among the first cells to suffer the consequences. This is why metabolic dysfunction is a feature of so many neurological conditions, including Alzheimer's disease.
How this connects to OneCarbon
Our research identified one-carbon metabolism — a specific metabolic pathway — as a critical mechanism neurons use to protect themselves under the conditions of Alzheimer's disease. Our probiotic, 1C-01, works by delivering the key metabolites of this pathway directly to the gut, where they can be absorbed and used by the body. In effect, it replenishes a supply that neurons need to stay resilient.
This is also why the gut matters more to brain health than it might initially seem. Many of the metabolites that neurons rely on are produced not by the brain itself, but by bacteria living in the gastrointestinal tract — a discovery that has fundamentally changed how scientists think about the relationship between diet, the microbiome, and neurological health.