Brain Health Basics
Neurons face a lifetime of threats — from toxic proteins to energy shortfalls to chronic stress. How well they withstand that pressure is not fixed. It can be influenced. Here's how.
Not all brains age at the same rate. Some people reach their eighties with sharp cognition intact; others begin to show signs of decline decades earlier. Genetics plays a role, but it does not determine everything. Increasingly, scientists understand that a key variable is neuronal resilience — the capacity of individual neurons to withstand stress, maintain function under pressure, and recover from damage. And crucially, it is a capacity that can be supported or undermined by biological and environmental factors throughout life.
Neurons face a remarkable range of threats across a lifetime. Some are acute; many are slow and cumulative. The most damaging share a common mechanism: they compromise the neuron's ability to generate energy.
Toxic protein accumulation
In Alzheimer's disease, amyloid plaques and tau tangles impair mitochondrial function — cutting off the energy supply neurons depend on to survive.
Chronic inflammation
Sustained neuroinflammation, triggered by infection, metabolic stress, or disease, damages neurons and disrupts the chemical environment they need to function.
Oxidative stress
Neurons produce high levels of reactive oxygen species as a byproduct of their energy demands. Without adequate antioxidant defences, this damages cellular structures over time.
Metabolic disruption
Conditions like type 2 diabetes, poor sleep, and sedentary behaviour reduce the availability of key metabolites neurons rely on for energy and repair.
What these threats have in common is that they all converge on the same vulnerability: a neuron that cannot generate enough energy to maintain itself, clear damage, and sustain its connections will eventually lose function and cannot be replaced.
Neurons are not passive in the face of these threats. When placed under stress, they activate a suite of protective responses, such as upregulating repair pathways, shifting their metabolic activity, and drawing on reserves to keep their energy supply stable. One of the most important of these responses, our research has found, is the activation of one-carbon metabolism: a cellular pathway that supports mitochondrial function, helps neutralise oxidative damage, and provides the raw materials for DNA repair.
Neurons that can sustain this response under prolonged stress are more resilient. They survive longer, maintain their connections more effectively, and are better able to resist the progression of neurodegenerative disease. Neurons that cannot mount or maintain this response are significantly more vulnerable.
The OneCarbon approach
Our research at the University of Cambridge showed that neurons naturally upregulate one-carbon metabolism as a protective response to Alzheimer's-related stress — and that people with genetic variants associated with stronger one-carbon activity in neurons appear to have a lower risk of developing the disease, though this is based on associative rather than direct causal evidence.
1C-01 takes a probiotic approach to supporting this pathway. The details of how it works are subject to ongoing scientific and intellectual property development — the goal is to complement the neuron's own defences, not override them.
Alongside our research on one-carbon metabolism, a growing body of evidence points to lifestyle factors that may influence neuronal resilience. Regular aerobic exercise increases the production of BDNF (brain-derived neurotrophic factor), a protein that supports neuronal survival and the formation of new connections — though the magnitude of this effect in humans remains an active area of research. Quality sleep is essential for the brain's glymphatic system — a waste-clearance mechanism that removes the toxic proteins implicated in Alzheimer's during rest. A diet rich in B vitamins, folate, and choline directly supports one-carbon metabolism. And chronic psychological stress, left unmanaged, elevates cortisol to levels that are demonstrably toxic to neurons in the hippocampus over time.
Neuronal resilience, in other words, is not a fixed trait. It is the product of a lifetime of biological inputs — some within our control, some not. The earlier those inputs are optimised, the larger the window of protection before irreversible damage occurs.