Depression is not just psychological: The role inflammation and the nervous system can play

By Carola Schröder

Many people experience depression not just as a "thought problem." They wake up in the morning feeling heavy, exhausted, and internally blocked. Sometimes it's hard to describe exactly what's missing, but something just isn't right anymore.

I often hear sentences like:

"I used to be a positive person."
"I don't recognize myself at all."
"It feels physical somehow."

And that's an important clue.

Because recent research shows that for some affected individuals, physical processes can be involved in addition to psychological factors. So-called low-grade, or subclinical, inflammatory processes and nervous system regulation are particularly discussed in this context.

This article explores what we know about this and why targeted nervous system regulation is more than just a trend.

Why depression often feels physical

Depression is often explained primarily psychologically. This is understandable and, in many cases, correct.

At the same time, many affected individuals report very physical sensations: leaden fatigue, inner restlessness, irritability, a feeling of constant tension, or sleep that doesn't truly refresh.

These are not purely thought processes. Your autonomic nervous system, your immune system, and hormonal processes play a role here.

From my own experience with chronic stress, I know how significantly a permanently activated system can manifest in the body. If something feels physical, one should at least consider the physical level.

Inflammation markers and depression: What research shows

Several meta-analyses have investigated whether increased inflammation-related markers are detectable in the blood of people with depression. In some affected individuals, elevated levels of C-reactive protein (CRP), interleukin-6 (IL-6), and TNF-α have indeed been found.

This does not mean that depression is fundamentally an inflammation. It's not that simple. However, the data suggest that inflammation-related processes may be involved in some affected individuals (Osimo et al., 2020; Osimo et al., 2019).

IL-6 is a signaling molecule of the immune system that is increasingly released during stress reactions, among other things. Such messengers can also act in the brain and influence areas associated with motivation, energy, drive, and mood.

It is important to note: This does not apply to every person with depression. However, it broadens the perspective and shows that the psyche and body work together more closely than we long thought.

Video on the topic of inflammation and mood
In this video, I explain the connections between inflammation, IL-6, and mood in more detail. 

Stress, immune system, and nervous system: A close connection

Your autonomic nervous system unconsciously controls your heartbeat, breathing, digestion, and stress responses. It constantly decides whether your body should be in activation or calming mode.

If activation predominates over a longer period, it not only affects your subjective experience of stress. Biological processes such as the immune system also react to it.

Chronic stress can intensify inflammatory processes, influence the release of certain messenger substances, worsen sleep, and hinder regeneration.

A body in constant alarm functions differently than a body that feels safe. Your system may have been operating under persistent stress or in protection mode for a long time. This is not a malfunction, but a comprehensible adaptation reaction to ongoing stress.

This is where nervous system regulation comes in.

Why regulation is more important than mere symptom treatment

If physical processes can be involved, a fundamental question arises: Is it enough to only consider individual symptoms? Or is it more sensible to look at the entire regulatory system?

Targeted regulation of the autonomic nervous system does not mean thinking away problems. It's about repeatedly giving the body signals of safety, reducing activation, and strengthening the calming parts of the nervous system.

The vagus nerve plays an important role in this.

The vagus nerve as a key to regulation

The vagus nerve connects the brain and the body. Among other things, it influences heart rate, digestion, inflammation regulation, and stress responses.

If vagal activity is stable, the body can switch more quickly between tension and relaxation. In cases of chronic stress, this balance sometimes gets out of whack.

That's precisely why targeted support of the vagus nerve is increasingly becoming a focus.

Sleep, blood sugar, and Omega-3: Keeping an eye on the system

In addition to targeted nervous system work, there are other factors that influence your biological balance.

Sleep: During the night, stress hormones and immune processes regulate themselves. If your nervous system doesn't truly calm down even during sleep, the foundation for stability during the day is missing.

Blood sugar: Strong fluctuations can trigger stress responses. Every counter-regulation costs energy. A balanced diet with sufficient protein, good fats, and fiber can provide relief here.

Omega-3 fatty acids: Meta-analyses show that EPA-dominant omega-3 preparations, in particular, can have moderate effects on depressive symptoms, supplementing existing therapies (Liao et al., 2019; Mocking et al., 2016). Omega-3 does not replace medical treatment, but it can be a building block within a holistic concept.

Targeted vagal stimulation: What does that mean in concrete terms?

If regulation largely runs through your nervous system, the practical question arises of how you can support these processes in everyday life.

Besides breathing exercises, movement, or conscious breaks, there are now also technical approaches to support vagal processes. These involve using targeted impulses to stimulate parasympathetic activity.

Such methods do not replace medical or psychotherapeutic treatment. However, they can be a supplementary component of a more comprehensive regulatory approach.

One example is the Vitalnerv-Stimulator 3.0 from Vital Generation. It uses targeted impulses to support vagal activation and is used by many users as a supplement to breathing and regulation techniques.

You can find more information here:

Regulation is a process: Not a one-time measure

Nervous system work is not a quick fix. It is a process that requires repetition, patience, and a certain understanding of one's own stress patterns.

Especially with chronic stress, a structured framework can be helpful. In the Vital Generation Plus program, the connections between the nervous system, inflammation, stress, and everyday practice are explored in depth. In addition to expert classification, practical impulses and continuous support are central to this member area. The program can also be tested for 14 days free of charge.

If you want to integrate regulation into your daily life long-term, such a framework can support you.

More information here:

A broader perspective

Depression is complex. It cannot be explained solely psychologically or solely physically.

When we broaden our view, it becomes clear how closely the nervous system, sleep, stress, and inflammation are connected. Understanding these connections does not replace therapy. But it can help to categorize one's own experience and identify new starting points for regulation.

If you are interested in how vagal regulation can be practically supported, you will find a detailed classification of vagus nerve stimulation and its biological background here:

In-depth content on nervous system regulation, stress mechanisms, and practical approaches for everyday life is also offered by the Vital Generation PLUS Program.

Sources

• Osimo EF et al. (2020). Inflammatory markers in depression: a meta-analysis of mean differences and variability. Brain, Behavior, and Immunity. https://doi.org/10.1016/j.bbi.2020.02.010
• Osimo EF et al. (2019). Prevalence of low-grade inflammation in depression: a meta-analysis of CRP levels. Psychological Medicine. https://doi.org/10.1017/S0033291719001454
• Liao Y et al. (2019). Efficacy of omega-3 PUFAs in depression: a meta-analysis. Translational Psychiatry. https://doi.org/10.1038/s41398-019-0515-5
• Mocking RJT et al. (2016). Meta-analysis and meta-regression of omega-3 PUFA supplementation for major depressive disorder. Translational Psychiatry. https://doi.org/10.1038/tp.2016.29