Healthy aging starts in everyday life: Dr. Rainer Gith on stress, mind-body approaches, and nutrients

Understanding Regulatory Capacity and Why It Is So Important for Healthy Aging

1. Dr. Gith, you work extensively with regulatory and mind-body approaches. What role do well-functioning regulatory mechanisms play in healthy aging, and how can people best support these processes in their daily lives?

Dr. Rainer Gith: Regulatory capacity means that our body is able to respond flexibly to stressors and subsequently return to a balanced state. Healthy aging depends less on individual biomarkers than on this biological adaptability. This applies to the stress axis, the immune system, metabolism, and emotional regulation.

What we know from longevity research: The more stable our regulatory system is, the better processes such as cell repair, immune function, metabolism, anti-inflammation, and hormonal balance function. A dysregulated system, on the other hand, leads in the long term to chronic stress, increased oxidative damage, and premature aging.

In everyday life, we can support our regulatory capacity by regularly introducing short, targeted stress stimuli (e.g., exercise, cold, heat) while consciously promoting recovery phases, such as through breathing, sleep quality, or mental calm. Balance makes all the difference.

In my view, longevity does not mean maximum optimization, but rather the preservation of adaptability. Those who can switch between activation and regeneration age more slowly and with greater resilience.

“Regulatory capacity means that our body is able to respond flexibly to stressors and subsequently return to a balanced state. Healthy aging depends less on individual biomarkers than on this biological adaptability.”

Better Stress Regulation: Foundations for Greater Balance and Well-being

2. Many people experience chronic high stress. What insights from stress physiology show how consciously managing stress can positively impact overall well-being, and which of your proven everyday strategies do you consider particularly helpful?

Dr. Rainer Gith: Stress is not inherently negative. What matters is how well we can regulate it. Stress physiology clearly shows: Short-term stress can enhance performance, but prolonged activation of the sympathetic nervous system leads to elevated cortisol, inflammatory processes, and, in the long term, exhaustion. So the problem is not stress itself, but a lack of downregulation.

What helps many people is awareness of how stress arises: not only through external events, but above all through the interpretation and evaluation of these stimuli. That is the starting point for stress competence.

Three of my tried-and-true everyday strategies:

1. Breathing for regulation – especially prolonged exhalation (parasympathetic activation).
2. Incorporate short recovery breaks – 1–3 minutes several times a day are more effective than one long relaxation session per week.
3. Exercise as an outlet (especially in nature) – even 10 minutes of moderate walking reliably regulates cortisol levels.

If stress is managed early on, the body remains resilient and mental stability is significantly higher.

“Short-term stress can boost performance, but prolonged activation of the sympathetic nervous system leads to elevated cortisol, inflammatory processes, and, in the long term, exhaustion. The problem, therefore, is not stress itself, but a lack of downregulation.”

Mind-body methods for energy and inner stability

3. In your work, the connection between mental state and physical health plays a major role. In your view, which mind-body techniques have proven helpful in promoting energy levels and inner balance in everyday life?

In my experience, three mind-body approaches in particular have proven effective:

• Movement as an activating and adaptive stimulus Both moderate daily movement and more intense forms of exercise, such as strength training or interval training, can boost energy levels. Short-term exertion activates metabolism and stress responses; in the long term, it improves the system’s resilience. The interplay between stimulation and regeneration is crucial.
• Breathing techniques – regulating and activating Slow nasal breathing with prolonged exhalation can calm an overloaded system and improve the ability to recover. More dynamic breathing patterns or brief breath holds, on the other hand, have an activating effect and subjectively increase alertness and focus. Breathing is thus a direct tool for managing energy.
• Mindfulness and Focus Training Regular mindfulness practice improves attention control and reduces chronic cognitive tension. Those who learn to perceive their thoughts more consciously increase their inner stability and use mental resources more effectively. This increases the available energy for performance in daily life.

The key point is: Energy does not arise from constant rest, but from adaptive flexibility. Those who can consciously manage activation and recovery remain capable and stable in the long term.

“Energy does not arise from constant rest, but from adaptive flexibility. Those who can consciously manage activation and recovery remain capable and stable in the long term.”

Promoting the body’s own protective mechanisms

4. Oxidative stress and modern daily stresses are often the focus of the longevity discourse. How can people contribute in their daily lives to supporting their body’s own protective mechanisms—within the framework of what is scientifically sound and compliant with health claims?

Lifestyle factors are particularly crucial here:

• regular exercise
• periods of metabolic rest, e.g., fasting intervals
• sufficient sleep
• a plant-based, nutrient-rich diet
• avoidance of chronic overload

Interestingly, moderate, short-term stress—such as exercise or cold exposure—activates adaptive protective programs at the cellular level. This principle is called hormesis.

In my view, it is important not to overwhelm the system with extremes, but rather to provide regular, small, healthy stimuli.

Side Fact: Allostatic load – when regulation is chronically overwhelmed

The term “allostatic load” describes the cumulative strain on the body caused by chronic stress. If downregulation fails to occur over an extended period, this can be associated with elevated inflammatory markers, metabolic changes, and accelerated aging processes.

Source: McEwen, B. S. (2007). Physiology and neurobiology of stress and adaptation. Physiological Reviews, 87(3), 873–904.

⁠⁠Link: https://doi.org/10.1152/physrev.00041.2006 

Breathing, the Nervous System & Recovery: An Underestimated Longevity Factor

5. You emphasize the importance of breathing for regulating the nervous system. What connections do you see between conscious breathing, recovery, and long-term well-being? How can beginners easily incorporate these techniques?

Dr. Rainer Gith: Breathing is one of the few systems that can be controlled both autonomously and voluntarily. That is precisely why it provides direct access to the nervous system. Many people breathe shallowly and irregularly in everyday life, often unconsciously in “stress mode.” This keeps the sympathetic nervous system active and hinders true recovery.

Conscious, slower breathing, especially with prolonged exhalation, can activate the parasympathetic nervous system and improve heart rate variability. This is considered a marker of regulatory capacity and resilience. At the same time, breathing can also be used to energize, for example through more dynamic breathing patterns in the morning. What matters is not the technique itself, but using it appropriately depending on your state.

For beginners, I recommend:

• The 4-6 breath: 4 seconds in, 6 seconds out
• Box Breathing: 4–4–4–4 (4 seconds in, 4 seconds hold, 4 seconds out, 4 seconds hold)
• Coherent Breathing: 5–6 breaths per minute

These techniques provide immediate relief, but their greatest value comes from regular practice. Just a few minutes a day can already yield very good results.

Breathing is not a trend, but a biological regulatory tool. Those who learn to use it consciously promote long-term recovery, energy, and emotional stability.

Side Fact: Parasympathetic Activation & Respiratory Rate

Studies link slow respiratory rates (about 5–6 breaths per minute) to improved vagal activity (the activity of the vagus nerve, the primary nerve for relaxation and regeneration) and increased heart rate variability. This can modulate the stress response in the short term and support the body’s ability to recover.

Source: Lehrer, P. M., et al. (2003). Heart rate variability biofeedback increases baroreflex gain and peak expiratory flow. Psychosomatic Medicine, 65(5), 796–805. 

Link: https://doi.org/10.1097/01.psy.0000089200.81962.19 

Understanding Nutrients: Which Functions Are Scientifically Proven

6. Many people are interested in micronutrients. Which vitamins or minerals can—within the scope of their scientifically proven and approved effects—support normal bodily functions such as energy metabolism, the immune system, or the nervous system? And what should one look for when making a selection?

Dr. Rainer Gith: Micronutrients fulfill clearly defined, scientifically proven functions in the body. However, it is important to note that they act within the context of an overall system—not in isolation.

Examples of well-documented functions include:

• Vitamin D contributes to the normal function of the immune system and to the maintenance of bones.
• Magnesium supports normal muscle function and the nervous system.
• Omega-3 fatty acids contribute to normal heart function (when consumed in adequate amounts).
• Zinc supports the normal function of the immune system and protects cells from oxidative stress.

However, the key point is this: a balanced, plant-based diet forms the foundation. Supplements can be useful if there is a deficiency or in specific life situations. I therefore recommend an individualized approach, ideally based on blood test results.

“Integrative longevity will likely be less about ‘anti-aging’ and more about training one’s own body to function optimally. The goal is to empower people to maintain their biological and mental resources in a stable, long-term manner using easily implementable, realistic strategies.”

Looking to the Future: Where Integrative Longevity Is Headed

7. Which developments in integrative or mind-body-oriented medicine do you currently find particularly exciting when it comes to helping people remain vital and balanced for as long as possible?

Dr. Rainer Gith: I see three key developments in integrative longevity medicine:

First: We are moving away from isolated individual interventions toward systemic thinking. Sleep, metabolism, stress regulation, social integration, and mental health are no longer viewed in isolation but as interconnected systems.

Second: Individualization is gaining importance. Biomarkers, genetic predispositions, and lifestyle factors increasingly allow for personalized strategies—not in the sense of pressure to optimize, but rather targeted prevention.

Third—and I consider this particularly important—the importance of regulatory capacity is coming more into focus. Heart rate variability, metabolic flexibility, or stress resilience are more meaningful than isolated lab values.

Integrative longevity will likely be less about “anti-aging” and more about training one’s own body to function effectively. The goal is to empower people to maintain the long-term stability of their biological and mental resources through simple, realistic strategies.

Side Fact: Heart Rate Variability as a Measure of Regulatory Capacity

Heart rate variability (HRV) describes the temporal variation between individual heartbeats. In stress research, it is considered an objective marker of the adaptive capacity of the autonomic nervous system. Higher HRV is associated with better stress resilience, more flexible regulation, and lower mortality.

Source: Shaffer, F., & Ginsberg, J. P. (2017). An Overview of Heart Rate Variability Metrics and Norms. Frontiers in Public Health, 5, 258. Link: https://doi.org/10.3389/fpubh.2017.00258 

Note: This interview is intended solely for general informational purposes. The assessments and statements presented reflect the personal scientific opinion and clinical experience of the interviewed expert and are based, among other things, on their own research.

The information shared reflects the expert’s personal professional experience and does not constitute official statements or claims by Vitamin Express.

The content does not constitute health claims authorized under EU Regulation (EC) No. 1924/2006 and should not be interpreted as statements regarding the prevention, treatment, or cure of diseases. This interview is not a substitute for individual medical advice. For health-related questions, please consult a healthcare professional.