As people move into their fifties, sixties and seventies it is not unusual for medications to accumulate gradually over time. A drug may have been introduced for reflux many years earlier, another added for cholesterol, another for blood pressure, another for sleep, and sometimes antidepressants remain in the background as well. Each prescription may have been introduced at a different moment for understandable reasons, yet by the time someone reaches later life the nervous system may be living within a complex biochemical environment shaped by many different medications.

This phenomenon is often described as polypharmacy, but the word itself rarely captures the deeper biological story. The nervous system does not simply coexist with these medications. It adapts continuously to the chemical signals they create. Each drug interacts with specific pathways in the body, and many of those pathways are closely connected with the metabolism that supports the brain.

In practice I often see individuals who arrive carrying long medication histories and who feel that their health has become fragmented into separate prescriptions addressing separate symptoms. They may describe fatigue, brain fog, reduced resilience, sleep disturbances or changes in memory and concentration. When we begin exploring the biology beneath those experiences a different picture often emerges.

One of the most revealing patterns is nutrient depletion. Many commonly prescribed medications influence the absorption, metabolism or utilisation of vitamins and minerals that are essential for neurological health. These changes are usually subtle and unfold slowly over time, which means they may remain unnoticed for many years.

Proton pump inhibitors such as omeprazole provide a clear example. These medications are widely prescribed to reduce stomach acid and relieve reflux symptoms. Stomach acid, however, plays a critical role in releasing nutrients from food and enabling the absorption of certain vitamins. When stomach acid remains suppressed for long periods the absorption of vitamin B12 can gradually decline. Vitamin B12 is essential for methylation, myelin maintenance and energy metabolism within nerve cells. When B12 becomes depleted the nervous system can begin to struggle with memory, concentration, mood regulation and nerve function.

Magnesium levels can also be affected by long term use of proton pump inhibitors. Magnesium is deeply involved in neuronal stability and energy production within cells. Low magnesium can contribute to neurological irritability, anxiety, sleep disturbance and fatigue.

Other medications influence different biochemical pathways. Statins, commonly prescribed to lower cholesterol, reduce the body’s production of coenzyme Q10 because both cholesterol and CoQ10 share the same metabolic pathway. CoQ10 is essential for mitochondrial energy production. The brain is one of the most energy demanding organs in the body, and mitochondrial function plays a crucial role in maintaining cognitive clarity and neurological resilience.

Certain blood pressure medications influence electrolyte balance and may contribute to long term mineral depletion, particularly magnesium. Because magnesium is involved in regulating neuronal excitability, deficiencies in this mineral can affect nervous system stability and stress regulation.

When several medications affecting different nutrient pathways coexist within the same body, the cumulative effect can place additional pressure on the nervous system. Over time these subtle biochemical shifts may influence energy production, neurotransmitter balance, inflammatory signalling and cognitive resilience.

This is where the work I do with individuals often begins. Rather than focusing only on symptoms, we explore the biological terrain that has developed across the course of a person’s life. Genetic testing through LifeCode Gx reports helps reveal variations in methylation pathways, detoxification capacity, inflammatory signalling and neurotransmitter metabolism. Organic acid testing can highlight mitochondrial stress, microbial influences from the gut and metabolic pressures affecting brain function. Mineral analysis frequently uncovers imbalances that have never previously been identified.

When these patterns are understood it becomes possible to support the nervous system more effectively. Targeted nutritional strategies, mineral rebalancing, mitochondrial support and microbiome restoration can begin strengthening the biological environment in which the brain operates.

People often come to me because they feel that their health has become overly dependent on medication and they want to understand the deeper biology of what is happening within their body. When they begin to see how genetics, metabolism and nutrient status influence their nervous system, a different conversation becomes possible about how to support brain health as they age.

The goal of this work is not to interfere with prescribing decisions - my patients do that directly with their prescribing physician. Instead, my work, is to strengthen the biological terrain in which the nervous system lives. When the body receives the nutrients and metabolic support it requires, the brain often becomes more resilient, more stable and better able to maintain cognitive function across time.

Understanding the ageing nervous system in this way reveals something important. Cognitive decline is rarely the result of a single factor. It emerges from the interaction between genetics, metabolism, inflammation, environmental exposure and the chemical landscape that has shaped the body across decades.

When we begin to look at that landscape in detail, opportunities for supporting the nervous system often appear that had previously remained hidden.