A glass of kefir at night is considered by many to be an old proven remedy for a good night's sleep. Modern studies show that this popular fermented dairy drink can indeed influence not only digestion but also brain function, mood, and quality of rest.
Kefir has long been considered one of the most beneficial products for gut health. However, in recent years, scientists have increasingly studied its impact on the nervous system and the psycho-emotional state of a person.
According to specialists, the connection between the gut and the brain is much closer than previously thought. This is why the state of the microbiome can reflect on mood, anxiety levels, and sleep quality.
Why Kefir Helps You Relax
Kefir contains tryptophan — an amino acid that is involved in the production of serotonin and melatonin. The former is responsible for emotional well-being, while the latter regulates sleep-wake cycles.
"In the evening, it is especially important for the body to transition from an active mode to a recovery mode. Foods containing tryptophan can facilitate this natural process," explains nutritionist Olga Yablokova.
Additionally, kefir contains live microorganisms that positively affect the gut microbiome.
The Gut and Brain Work Together
Scientists are increasingly discussing the "gut-brain axis" — a complex system of interaction between the digestive and nervous systems.
Some bacteria can influence the production of gamma-aminobutyric acid (GABA) — a substance that helps calm the nervous system and reduce anxiety levels.
"Normal gut microbiota plays an important role in a person's emotional state. Disruption of its balance is increasingly associated with anxiety disorders, chronic stress, and sleep problems," note clinical nutrition specialists.
What Bacteria Are Found in Kefir
Kefir is considered one of the richest sources of probiotics among fermented dairy products. It contains dozens of species of beneficial microorganisms, including lactobacilli, bifidobacteria, and yeasts.
Research shows that a significant portion of these bacteria successfully passes through the stomach and reaches the intestines, where they continue to perform their functions.
Particular interest is drawn to the bacterium Lactobacillus kefiri, which helps suppress the growth of pathogenic microorganisms and supports the immune system.
Can Kefir Improve Sleep?
Some studies indeed link regular consumption of kefir with improved sleep quality and reduced anxiety levels.
However, doctors emphasize that kefir is not a cure for insomnia. Its effect depends on the overall health, diet, stress levels, and lifestyle of a person.
"If a person regularly lacks sleep, experiences chronic stress, or suffers from serious sleep disorders, one glass of kefir will not be enough. But as part of a healthy evening diet, it can be quite beneficial," experts note.
When Is It Best to Drink Kefir?
Despite the popular recommendation to drink kefir right before bed, specialists advise doing so one and a half to two hours before going to sleep.
During this time, the drink will partially digest and will not cause discomfort for people with sensitive digestion.
This is especially important for those prone to bloating, gastroesophageal reflux, or other gastrointestinal issues.
Who Should Be Cautious
Doctors remind that kefir is not suitable for everyone. Its consumption should be limited for people with lactose intolerance, certain stomach diseases in the acute phase, and individual sensitivity to fermented dairy products.
Kefir should also not be viewed as a universal remedy for depression, anxiety, or insomnia.
Modern science confirms that kefir can positively influence gut microbiota, mood, and sleep quality. Thanks to its content of tryptophan and live probiotics, this drink can become a beneficial part of an evening diet. However, it provides maximum effect only in combination with a balanced diet, sufficient physical activity, and a healthy sleep regimen.
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