🧬 The effect of white and black mulberry on gut bacteria and metabolism: promising prospects awaiting human studies
Mulberry, especially white mulberry (Morus alba) and black mulberry (Morus nigra), has long been used in food and traditional medicine across the ages. Recently, scientists have begun studying the effect of the bioactive compounds in this plant on gut microbiota and the associated potential effects on the body’s metabolism. Current research indicates that the results vary according to the type of mulberry used, the part extracted, and the processing method. This makes mulberry a complex and appealing subject for study in the fields of health and biology.
In this article, based on a recent review of nutrition and microbiology, we explain the scientific mechanisms linking mulberry to gut bacteria and the potential effects on metabolic disorders, while highlighting the need for clinical studies on humans to discover the extent to which these hypotheses are correct.
🧠 Gut bacteria and their role in metabolism
Gut bacteria form a complex ecosystem that directly affects digestive health and its functions, and its influence extends to the body’s metabolic processes in general.
These microbes produce short-chain fatty acid compounds such as acetate, propionate, and butyrate when fermenting food materials. These compounds play a vital role in:
- Supporting normal intestinal functions
- Improving nutrient absorption
- Regulating blood glucose and fat levels
Therefore, it is believed that modifying the composition and activity of gut bacteria may contribute to improving metabolic health, and mulberry, thanks to its rich composition of bioactive compounds, is a prime candidate to achieve this effect.
🌱 Bioactive compounds in mulberry and their varied effects
Mulberry compounds vary greatly depending on the species and the part of the plant used. Most research has focused on:
- The leaves of white mulberry, which contain the compound 1-deoxynojirimycin (DNJ), known for its effect on regulating carbohydrate metabolism, in addition to polyphenols and polysaccharides.
- In black mulberry, active compounds such as anthocyanins and phenolic compounds are concentrated, with polysaccharides also present.
The method used to process plant parts plays an important role in determining the final composition of the biological materials and their biological effect, and these methods include:
- Drying
- Testing through fermentation processes
- Different extraction methods
Accordingly, the active components of preparations can differ even if they are taken from the same plant material, leading to changes in the quality and quantity of health effects.
🧪 How does mulberry affect gut microbes?
Studies have shown that extracts from mulberry leaves and fruits may change the composition and activity of gut bacteria. The following has been observed in several experiments:
- An increase in some beneficial bacteria
- Higher production of short-chain fatty acids such as acetate and butyrate
- Improvement in indicators related to glucose and fat metabolism
However, the results were not always uniform, as the type of material used, along with the processing method, greatly affected the recorded effects.
For example, studies were conducted on polysaccharides from black mulberry fruit, where different extraction methods produced products with varying structural properties that enhanced their use by gut microbes to different degrees. Water extraction of polysaccharides with the addition of the enzyme pectate lyase showed the strongest prebiotic potential.
Other research on mulberry leaf polysaccharides showed that molecular weight and monosaccharide composition play a role in determining which bacteria are able to consume these compounds, and thus determine the type of fatty acids that are eventually formed.
🩺 Combined effects of compounds in mouse experiments
One of the most important findings came from experiments on mice fed a high-fat diet, where combined preparations from white mulberry products were used, bringing together polyphenols and polysaccharides.
The results showed that these complex formulations were more effective in modifying gut bacteria than using each compound separately, and at the same time several indicators related to metabolic syndrome and gut health improved.
Additional research used transplantation of gut microbes from animals that had consumed these preparations into other animals, and the latter saw improvement in some metabolic conditions, linking the change in microbes directly to the health effects.
These findings highlight the importance of the interaction of the different compounds in mulberry and their integrated effect, not just focusing on a single compound.
👩🔬 The origins of the research: multidisciplinary student collaboration
This project began in the Nutri-Sfera student research group at Wroclaw Medical University, where two students specializing in pharmaceutical dietetics and nutrition collaborated to develop the project idea.
This joint work helped integrate different approaches to understanding mulberry as a plant containing components with a biological effect that interacts with gut bacteria and affects metabolism.
🧬 The need for clinical studies on humans
Despite the encouraging results in the laboratory and in animal models, the bigger question remains about the extent to which these benefits apply to humans.
So far, there are no published clinical studies testing the effect of mulberry preparations on the composition and functions of gut bacteria in humans. In addition, the diversity in extraction and processing methods makes it difficult to make direct comparisons between the available studies.
The researchers believe that conducting clinical trials using standardized and chemically well-analyzed preparations will help in understanding:
- The extent of the different mulberry capacities to modify intestinal microbes in humans
- The size of the effects and the degree of their stability
- The link between those effects and tangible health outcomes in metabolism and gut health
This reflects the importance of precision in selecting plant materials, identifying their components, and designing clinical trials in a way that reflects the scientific reality of complex compounds rather than merely testing a single compound.
📌 Conclusion
Current evidence indicates that mulberry, especially white and black mulberry, contains active compounds that can modify gut bacteria and positively affect metabolism. It is becoming clear that the combination of polyphenols and polysaccharides may have a stronger effect than each compound alone.
The interaction between the type of mulberry, the plant part used, and the processing method determines the form and level of these effects, which necessitates precise manufacturing and good chemical analysis before application in humans.
The biggest challenge remains proving these results clinically in humans, which opens prospects for more research that can translate this knowledge into practical applications in the prevention of, or improvement in, metabolic health.
The information available so far gives us valuable insight into the potential of mulberry as a factor that enhances gut health and influences metabolic changes, but it also reminds us of the importance of evaluating these results in humans with precision and scientific transparency.
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