Your Brain Isn’t Broken. It’s Overwhelmed.

What I Learned from neurologist, Dr Olivia Lesslar

We have mistaken nervous system overload for a personal performance problem. The Gen X women I work with are so overloaded, they are running complex lives on nervous systems with no margin. Many are supporting teenagers or adult children at home while caring for ageing parents. Their careers are often peaking in intensity just as their physiology is shifting. Their cognitive load is high. Their recovery time is shrinking.

What I see is not fragility. It is women running complex lives on nervous systems with no margin.

The dominant response to this has been optimisation. Track your sleep. Hack your morning. Stack supplements. Add breathwork. Mediate. Add cold exposure. Journal. Add red light. Add more effort to the effort.

Optimisation culture has reframed exhaustion as a performance problem. But what if the issue isn’t that you’re underperforming? What if the issue is that your brain is interpreting modern life as unsafe?

I recently heard Dr Olivia Lesslar, a neurologist working in psychoneuroimmunology, speak about how the brain, immune system and nervous system communicate. Her work maps how ancient threat-detection systems are misfiring in modern environments. Her central insight was simple: many symptoms are not signs of failure. They are survival adaptations.

The brain’s primary role is not elegant thinking. It is threat detection. It constantly integrates signals from light exposure, posture, gut activity, immune signalling, hormonal shifts, sound, temperature and social cues to answer one question: Am I safe?

When enough inputs feel unpredictable, excessive or incoherent, the system shifts into protection mode. Energy conservation increases. Inflammatory tone rises. Sensitivity heightens. Sleep fragments. Mood destabilises. Cognitive clarity drops.

From an evolutionary standpoint, this is intelligent. From a productivity standpoint, it looks like dysfunction.

Dr Lesslar describes nine categories of ancient survival threats that the brain evolved to monitor. The language is metaphorical, but the framework highlights something important: the human nervous system evolved in embodied, rhythmically regulated environments. Daylight aligned with wakefulness. Movement accompanied cognition. Social contact regulated physiology. Food was intermittent but real. Darkness meant rest.

Modern life disrupts all of those rhythms. We consume intense visual input from screens without movement. We sit for hours. We eat irregularly. We are socially connected but physiologically isolated. Artificial light extends the day indefinitely. Cognitive demand rarely switches off.

Whether or not one agrees with every element of her categorisation, the pattern is biologically plausible. The brain struggles with incoherence. When sensory input does not match physical context, the nervous system does not interpret this as “busy but successful.” It interprets unpredictability. And unpredictability, to a threat-detection system shaped by evolution, often reads as danger.

This reframes much of midlife physiology. Blue light late at night disrupts sleep architecture not because you lack discipline, but because circadian signalling is being overridden. Blood sugar instability amplifies anxiety because famine signalling remains one of the most powerful evolutionary alarms. Chronic sitting alters proprioceptive input and reduces neurochemical regulation. Loneliness increases inflammatory markers because tribal belonging has always been a survival requirement.

In midlife, as oestrogen shifts and resilience narrows, the buffering capacity decreases. The same inputs that were tolerable at 32 can feel destabilising at 48. Optimisation culture tells women to try harder. Track more. Restrict more. Improve more.

But if the nervous system is already in threat mode, more input is not neutral. It is additive.

This is where I think the wellness industry has quietly gone wrong. It has medicalised normal protective responses and then sold complexity as the solution. The assumption is that symptoms reflect deficiency, laziness, or poor compliance. The answer becomes layering protocols onto already overloaded systems.

What if the first intervention is not optimisation, but recalibration?

Recalibration is not glamorous. It looks like daylight exposure within thirty minutes of waking. It looks like consistent meals to reduce famine signalling. It looks like reducing artificial light at night. It looks like head movement, balance, proprioception, and embodied physical input. It looks like time with people who regulate rather than deplete you. It looks like rhythm.

None of this is revolutionary. But it is foundational.

This seminar sharpened how I think about The Health Edit. Investigation and data matter. Biomarkers matter. Precision matters. But nothing holds without regulation. If the brain is constantly scanning for danger, every intervention feels like more stimulation. Sequencing becomes critical. Safety first. Strategy second. Complexity last.

If you feel wired but tired, inflamed, hyper-aware, reactive, or unusually sensitive, your brain may not trust your environment. That is not weakness. It may be an intelligent system stuck in protection mode.

The solution is not to override it with more optimisation. It is to restore enough safety for adaptation to occur.

Healing does not happen in a system that feels under siege. It happens in one that feels safe enough to change.

If you are ready to approach your health strategically rather than reactively, that is exactly what my one-on-one Health Reset Intensive work is designed to do. Book an introductory call. 

Susan Hunter is a registered naturopath, author and speaker with twenty years of clinical experience and the creator of The Health Edit framework. She works predominantly with women over 40 to identify and address the root cause of their health problems with relevant, thorough testing and clear strategy that educates and empowers them.