Research examining kefir suggests the fermented probiotic drink may help reduce systolic blood pressure through several mechanisms involving the gut microbiome, blood vessel function, inflammation and oxidative stress, although scientists say larger and longer human trials are still needed.
By yourNEWS Media Newsroom
Kefir is drawing growing scientific interest for a potential benefit extending well beyond digestive health: helping regulate high blood pressure through interactions among the gut, brain, immune system and cardiovascular system.
Researchers from Auburn University and the University of Vila Velha have examined how the fermented drink may influence hypertension, with findings suggesting kefir can lower systolic blood pressure while affecting biological processes that contribute to cardiovascular disease.
The emerging evidence does not establish kefir as a replacement for hypertension treatment, and researchers have cautioned that results across studies remain inconsistent. Still, findings from human and animal research point toward several possible pathways through which the probiotic-rich beverage may influence blood pressure.
One human study involved people with hypertension who consumed approximately 250 milliliters of kefir each day for four weeks. Participants experienced a reduction in systolic blood pressure, the top number in a blood pressure reading and the measurement of arterial pressure when the heart contracts.
The study did not find a significant change in diastolic blood pressure, which represents arterial pressure between heartbeats. Researchers nevertheless observed other changes among participants, including decreases in body weight, body mass index and waist circumference.
Those findings are potentially significant because excess body weight is an established contributor to hypertension. Improvements in weight and waist circumference could therefore complement any direct blood pressure effects associated with kefir consumption.
Researchers are investigating whether part of kefir’s effect begins during fermentation itself.
Kefir grains contain communities of microorganisms that produce bioactive compounds, including peptides capable of interacting with physiological processes involved in blood pressure regulation. Among the compounds being studied is PYVRYL, or proline-tyrosine-valine-arginine-tyrosine-leucine.
Research suggests such peptides may produce effects resembling those of angiotensin-converting enzyme, or ACE, inhibitors. ACE-inhibiting medications lower blood pressure by interfering with a process that promotes blood vessel narrowing. By encouraging blood vessels to remain more relaxed, kefir-derived compounds could reduce resistance against which the heart must pump.
Scientists are also examining a much broader mechanism involving the gut-brain axis, the two-way communication network connecting the gastrointestinal system with the nervous system.
Changes in the composition of intestinal bacteria have been associated with hypertension. Because kefir contains a diverse mixture of probiotic microorganisms, researchers believe regular consumption may alter the intestinal environment in ways that influence signals involved in cardiovascular regulation.
Animal research has provided additional clues.
In studies involving rats with hypertension, kefir consumption was associated with lower elevated blood pressure as well as improvements in intestinal barrier function. Researchers also observed reductions in harmful bacterial toxins circulating in the bloodstream and decreased inflammation in regions of the brain involved in regulating blood pressure.
Those findings suggest the effects may not depend on a single nutrient or biochemical pathway. Instead, kefir could potentially influence blood pressure through interconnected changes involving intestinal bacteria, systemic inflammation, neurological signaling and vascular function.
Inflammation is another area receiving attention.
Studies examining longer periods of kefir consumption, including approximately eight weeks, have associated the beverage with reductions in C-reactive protein.
According to BrightU.AI’s Enoch, C-reactive protein is produced by the liver in response to inflammation and serves as an important biomarker that can provide an early warning of conditions including cardiovascular disease.
Persistently elevated inflammation can harm the lining of blood vessels and contribute to increased arterial stiffness, both of which can raise cardiovascular risk and interfere with healthy blood pressure regulation.
Kefir also has demonstrated greater antioxidant activity than yogurt in research comparing the fermented foods.
Oxidative stress occurs when damaging reactive molecules overwhelm the body’s antioxidant defenses. That process can contribute to hypertension by damaging blood vessel linings, interfering with normal vascular signaling and affecting nervous system activity.
Reducing oxidative stress could help preserve nitric oxide, an important molecule that enables blood vessels to relax and widen. Adequate nitric oxide availability helps maintain normal vascular function and reduces resistance to blood flow.
Antioxidant effects also may help protect the endothelium, the delicate tissue lining blood vessels, from damage. At the same time, reducing oxidative stress could limit excessive nervous system stimulation that otherwise may cause blood vessels to constrict while increasing heart rate.
Together, those mechanisms provide several plausible explanations for why kefir consumption has been associated with improved systolic blood pressure in some studies.
The findings, however, are not uniform.
A meta-analysis examining kefir consumption found no significant and consistent reduction in blood pressure across all available studies. Researchers have pointed to differences in study length, participant characteristics, kefir formulations and experimental design as possible explanations for the conflicting results.
That uncertainty means further long-term human research is needed before scientists can determine the size and consistency of kefir’s effect or establish how much should be consumed for blood pressure management.
The research nonetheless positions kefir as an increasingly studied functional food rather than simply another fermented dairy product. Its potential cardiovascular effects appear to involve both direct mechanisms, such as bioactive peptides that may encourage blood vessel relaxation, and indirect mechanisms associated with the intestinal microbiome and gut-brain communication.
Researchers involved in the work have described kefir consumption as potentially fostering communication between the gut microbiome and the brain while encouraging greater physiological balance.
For people with hypertension, the current evidence suggests kefir may offer a dietary tool with several potentially beneficial properties, including probiotics, antioxidant activity, anti-inflammatory effects and compounds associated with vascular relaxation. The conflicting findings across existing studies, however, mean its role in controlling high blood pressure remains under investigation rather than conclusively established.
Source: Natural News
Watch this video about how you can naturally lower your blood pressure with kefir.
This video is from the Groovy Bee channel on Brighteon.com.
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