Why Your Nervous System Reacts to What You Eat

By Carola Schröder

Many people with chronic conditions are very conscious of stress, sleep, and exercise. They try to make their daily lives calmer, recover better, and relieve their nervous system.

However, one potential influencing factor is surprisingly often overlooked: nutrition.

Yet, the body doesn't just react to external stress or emotional strain. What we eat constantly changes the internal conditions under which our nervous system operates. Blood sugar, fatty acids, amino acids, and specific micronutrients influence processes closely linked to energy, sensory processing, and inflammatory responses.

I constantly notice that this connection is often underestimated. Many people do pay attention to a "healthy" diet and yet experience situations where they become very tired after eating, their energy drops, or their body reacts more sensitively on some days.

Of course, nutrition is never the only factor. Chronic conditions almost always arise from a combination of various influences. Nevertheless, what we eat daily can play a larger role than many realize.

A look at some typical dietary factors shows why the nervous system can react sensitively to what ends up on our plate.

Blood Sugar, Energy, and the Nervous System

A primary factor that can play a role here is blood sugar.

Many people are familiar with the situation: after a meal, you feel full, perhaps even briefly energetic. But not long after, a significant energy dip follows. Some become tired, others experience concentration problems, head pressure, or even headaches. Still others suddenly feel restless or irritable.

Such reactions can be caused, among other things, by strong fluctuations in blood sugar levels.

Especially meals containing many readily available carbohydrates can cause blood sugar to rise relatively quickly. The body reacts by releasing insulin to transport the sugar from the blood into the cells. In some cases, however, the blood sugar level drops relatively quickly afterward.

For the body, this means a kind of internal stress situation. The nervous system reacts by trying to stabilize the energy balance again. This can activate hormones and stress responses, which in turn affect concentration, mood, and resilience.

It's not necessarily about blood sugar being "too high" or "too low." Many people have completely normal lab values. Instead, the fluctuations within this range can be decisive. If blood sugar rises sharply again and again throughout the day and then drops again, it can put a significantly greater strain on the metabolism than stable values.

People with chronic fatigue, in particular, often report feeling such changes particularly clearly. After certain meals, they suddenly feel much more exhausted than before or notice an inner restlessness that they initially can hardly explain.

It's not just the carbohydrates themselves that are crucial, but above all, how stable blood sugar remains throughout the day and how much individual meals burden the metabolism.

Healthy Fats, Omega-3, and the Nervous System

Besides blood sugar, another often underestimated factor plays a role: the composition of fats in our diet.

The nervous system is one of the fattiest structures in our body. The brain also largely consists of fat. Especially the cell membranes of nerve cells – the coverings through which signals are transmitted and information processed – are made up of complex fatty acids.

For these membranes to remain stable yet flexible, the body relies on obtaining suitable fatty acids through food. The fats regularly eaten can therefore influence how well these processes function.

Not all fats act the same way. Highly processed fats can be particularly problematic, such as trans fats found in some industrial baked goods, heavily fried foods, or ready-made products. Such fats can adversely affect the composition of cell membranes and have long been suspected of promoting inflammatory processes in the body. Therefore, in a diet with as many natural foods as possible, natural fat sources are often used, such as high-quality olive oil.

In addition to the overall fat quality, the ratio of certain fatty acids also plays a role – especially the ratio of omega-6 to omega-3 fatty acids.

Both belong to the essential fatty acids that the body cannot produce itself and must therefore obtain through diet. In the body, they are processed into various signaling substances. Omega-6 fatty acids are involved, among other things, in the formation of messenger substances that can promote inflammatory reactions. Omega-3 fatty acids, on the other hand, tend to regulate inflammatory processes and also play an important role in the structure of cell membranes.

However, the actual problem rarely lies in a single fatty acid. The crucial factor is primarily the ratio between the two. In today's diet, omega-6 fatty acids often clearly predominate, while omega-3 is consumed comparatively rarely.

Over time, this imbalance can affect various processes in the body – including inflammatory reactions, metabolic processes, and possibly also the functioning of cell membranes in the nervous system.

Energy Production in Cells: The Role of Mitochondria

Another aspect that has been investigated in research for a long time concerns energy production in cells.

In almost every body cell, there are small structures called mitochondria. They are often described as the "powerhouses of the cell" because they produce energy from nutrients. The body needs this energy for almost all processes – from muscle movements to metabolic reactions to nervous system activity.

For this energy production to function reliably, mitochondria depend on various nutrients. These include fatty acids, certain amino acids, and various micronutrients such as B vitamins, magnesium, and coenzyme Q10.

If these building blocks are only available in limited quantities through diet over the long term, or if the metabolism is under severe strain, this can affect the efficiency of energy production. Therefore, research is increasingly investigating the role that changes in mitochondrial function might play in chronic fatigue and reduced resilience.

Here again, it becomes clear that nutrition is not a single lever that changes everything immediately. However, it can influence the conditions under which cells operate.

Especially with persistent fatigue, it can therefore be beneficial to provide the body with sufficient nutrients regularly – for example, through as natural foods as possible and freshly prepared meals instead of heavily processed products.

Such changes don't have to be complicated. It often starts with preparing simple dishes yourself, consciously choosing ingredients, and regularly giving the body what it needs for energy production and metabolism.

Protein, Amino Acids, and the Nervous System

Besides fats and carbohydrates, protein also plays an important role in many bodily processes. Proteins consist of so-called amino acids, which the body needs for numerous functions.

Some of these amino acids are particularly important for the nervous system. They are used to form neurotransmitters – messenger substances through which nerve cells communicate with each other. These include, for example, serotonin, dopamine, and norepinephrine, which are involved in regulating mood, concentration, and stress responses.

For the body to produce these messenger substances, the corresponding amino acids must be regularly consumed through diet. Protein-rich foods therefore not only provide building blocks for muscles or tissues but also important starting materials for processes in the brain and nervous system.

However, in practice, protein often plays a rather minor role in many diets. Meals often consist primarily of carbohydrates, while protein-rich foods are consumed only in small quantities – for example, at breakfast or in snacks.

Here again, a similar principle applies as with other dietary factors: it is not a single food item that is crucial, but the long-term supply of the body with the necessary building blocks.

A diet that regularly contains enough protein and focuses on natural foods can therefore help to provide the body with the amino acids needed for many metabolic and nervous system processes.

Protein can come from both animal and plant-based foods. Animal protein sources usually have a particularly complete amino acid profile and are often efficiently utilized by the body. Plant-based protein sources can also make an important contribution but often require a more conscious combination of different foods.

Nutrition as a Building Block for Energy and the Nervous System   

When these various aspects are considered together, it becomes clear that nutrition can be linked to energy, metabolism, and the nervous system on multiple levels.

Blood sugar influences how stably energy is available to the body. The composition of fats can play a role in cell membranes and inflammatory processes. Protein provides amino acids, which are used to create important messenger substances for the nervous system, among other things. And finally, in the mitochondria, the energy molecules that the body needs for almost all functions are produced from nutrients.

Of course, this does not mean that nutrition alone determines health or illness. Chronic conditions usually arise from a combination of various factors – such as stress, sleep, nervous system strain, or individual metabolic peculiarities.

Nevertheless, nutrition can be an important building block that either additionally burdens the body or helps it to function more stably.

If you're interested in which dietary habits are particularly often underestimated in this context, you can find a helpful explanation in the following video. While the title refers to fibromyalgia, many of the connections described also apply to other forms of chronic fatigue or sensitive stress reactions of the body.

The video discusses three common dietary mistakes that occur surprisingly often in everyday life and can influence energy and metabolism more significantly than many suspect.

In it, I discuss, among other things, typical dietary mistakes that can play a role, especially in chronic fatigue – even if many people initially don't associate them with their energy levels.

Anyone who wants to delve deeper into topics such as the nervous system, stress regulation, and practical strategies for chronic conditions can find further content in the Vital Generation membership area. Various approaches are regularly explored there in videos, lectures, and practical everyday tips.

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