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Biorhythm—How Our Internal Clock Affects Our Bodies

April 2, 2026Leilah FörsterReading time: 3,8 Minuten

Our bodies follow a natural rhythm—known as the biorhythm. This refers to the biological processes in the body that repeat themselves every day. This rhythm is like an invisible conductor: It ensures that hormones are released at the right time, that we’re awake in the morning and tired in the evening, and that our metabolism functions optimally.

This rhythm is regulated by our “internal clock” in the brain, which is guided by the natural alternation of light and darkness. In chronobiology, this is referred to as the circadian rhythm—a 24-hour cycle that regulates sleep, energy, digestion, and regeneration.

This means that because biological processes are synchronized with the circadian rhythm by our “internal clock,” our bodies do not function the same way around the clock. If this finely tuned schedule becomes disrupted, it can have a direct impact on sleep, energy levels, and well-being.

In this article, you’ll learn how your biorhythm works and how you can effectively support it through your lifestyle and specific nutrients.

What is the biorhythm?

The biorhythm describes the natural fluctuations in our bodies throughout the day. These include, among other things, the sleep-wake cycle, hormone production, and physical performance.

During the day, the body is geared toward activity: hormones such as cortisol boost alertness and energy. In the evening, melatonin takes over and prepares the body for rest and sleep.

These processes are closely interlinked. A stable circadian rhythm ensures that we feel energetic during the day and can rest at night. If it is disrupted—for example, by stress, shift work, or artificial light—it can have long-term effects on sleep, metabolism, and overall health.

What role does the biorhythm play in sleep and recovery?

A smiling man in a blue shirt is sitting on a train, looking out the window at a vast, green, rolling landscape; Image note: AI-assisted content

Above all, our sleep-wake cycle is largely controlled by our biorhythm. During the day, the hormone cortisol ensures that we are awake, alert, and productive, and as soon as it gets dark, melatonin takes over. Melatonin signals the body to wind down and transition into nighttime regeneration. This delicate interplay determines when we get tired, how deeply we sleep, and how refreshed we wake up in the morning.

If this rhythm is stable, sleep quality improves significantly. The body uses the night for rest, hormone regulation, and cell regeneration, and we start the day with more energy. However, if it is disrupted—for example, by stress or irregular sleep schedules—it affects nearly all processes in the body. Fatigue, difficulty concentrating, a slowed metabolism, and hormonal fluctuations are just a few of the possible consequences. A stable circadian rhythm is therefore much more than just a “healthy sleep routine.” It is the foundation for long-term health.

What is chronobiological nutrition?

A woman in a light-colored blazer and a smiling man in a white shirt are strolling and chatting along a park path between blossoming trees; Image note: AI-assisted content

Our metabolism also follows the internal rhythm of our biorhythm. Chronobiological nutrition, therefore, means planning meals in harmony with this rhythm, because our bodies process nutrients with varying degrees of efficiency depending on the time of day.

  • Metabolism is particularly active in the morning. Enzymes and hormones are now geared toward providing energy. 
  • Digestion usually peaks at noon. Nutrients are absorbed and processed particularly well at this time.
  • In the evening, the body gradually shifts into recovery mode. Metabolism and digestion slow down, and the body begins to prepare for sleep. 

Chronobiology makes it clear: It’s not just what’s on our plate that matters, but also “when.” Eating in harmony with your “internal clock” naturally supports your energy levels, metabolism, and recovery. In the next section, you’ll learn how to consciously plan your meals according to your biorhythm.

How can I incorporate biorhythm-based eating into my daily life?

Two smiling women are chatting in a bright, modern office while enjoying fresh salads during their lunch break together; Image note: AI-assisted content

But how exactly can you adjust your meals to your natural biorhythm? The following tips can help you do that:

  • Use breakfast to kick-start your energy: Your metabolism is active in the morning. That’s why a balanced meal containing protein (e.g., eggs, yogurt),  healthy fats (e.g., walnuts, flaxseeds), and complex carbohydrates (e.g., oats in the form of muesli or porridge) ensures a steady supply of energy and helps maintain performance.
  • Plan your main meal for lunchtime: Your digestive system works most effectively at lunchtime, which is why a nutritious main meal is particularly well absorbed then.
  • Eat lighter in the evening: When your body shifts into rest mode in the evening, it’s best to eat meals that are easy to digest—this helps promote sleep and nighttime recovery.
  • Stick to regular mealtimes: Set times help your “internal clock” stay on track and bring balance to your energy metabolism—which is also ideal for curbing cravings.
  • Avoid late-night snacking: Eating right before bed throws your metabolism off balance and can disrupt the quality of your sleep.

How can natural dietary supplements affect the biorhythm?

A person lying comfortably on a sofa is holding a glass of tea and a can of TISSO Pro Melatonin Depot

Certain micronutrients can also help your body stabilize its natural biorhythm. What matters most is not just what you consume, but especially when you consume it. This allows your body to distinguish more clearly between periods of activity and rest. 

Especially in the evening, specific combinations of nutrients can help ease the transition into rest:

  • Pro Melatonin Depot combines sustained-release melatonin with chamomile and reishi. The sustained-release technology helps you fall asleep and stay asleep, as the melatonin is released immediately and continues to be released over several hours.
  • Pro Somnia Relax contains a carefully selected combination of magnesium, alpha-casozepine (Lactium®), and asparagus extract (ETAS®50) to support the nervous system and mental well-being.
  • Pro Magnesium provides you with three organic forms of magnesium that support healthy muscle and nerve function—for greater relaxation and more energy.

When used strategically, these micronutrients can help restore balance to your natural biorhythm.

Conclusion: Why a Stable Biorhythm Is the Foundation of Good Health

Our biorhythm doesn’t just influence our sleep patterns. It regulates nearly all of the body’s key processes— from hormone production to metabolism and digestion, and on to energy and regeneration. When we live in harmony with our circadian rhythm (our “internal clock”), all these processes run more efficiently and harmoniously.

Even small changes in our sleep and eating habits can help stabilize our “internal clock.” A targeted supply of micronutrients can also be helpful—especially when stress or an irregular daily routine throws our balance off. In the products Pro Melatonin Depot, Pro Somnia Relax, and Pro Magnesium, you’ll find exactly the nutrients that can help ease the transition into nighttime regeneration.

Because when you live in harmony with your natural rhythm, you're not just investing in better sleep, but also in long-term health, balance, and performance.

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FREQUENTLY ASKED QUESTIONS

Yes. By maintaining a regular sleep schedule, eating meals at set times, getting enough natural light, and following mindful evening routines, you can stabilize your circadian rhythm. Exercise, stress management, and specific micronutrients can also help bring your “internal clock” back into balance.

The “internal clock” regulates the release of hormones such as melatonin and cortisol. It therefore influences when you get tired, how deeply you sleep, and how well your body recovers.

Regular meals and eating the right foods at the right times of day help your metabolism and digestion function according to their natural rhythms.

Regular sleep schedules, plenty of daylight, periods of rest in the evening, and reduced screen time can help restore balance to your “internal clock.” During stressful periods, specific nutrients such as Magnesium or Melatonin have a supportive effect.

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