Researchers at Toho University have discovered that a natural plant compound found in rice bran and whole grains may help control how strongly the intestines contract.
The study, led by Dr. Keisuke Obara, Dr. Kento Yoshioka and Professor Yoshio Tanaka, was published as new research exploring ways to improve digestive health.
The findings suggest that the compound, called ferulic acid, could eventually become part of future dietary approaches for certain bowel disorders.
Ferulic acid is a natural substance found in rice bran, wheat, oats and many other plant foods. It is already known for its antioxidant properties, which help protect cells from damage.
Scientists have also studied its possible benefits for brain and heart health, but far less has been known about how it affects the digestive system.
The digestive tract relies on smooth muscle contractions to move food and waste through the intestines. When these movements become too fast or too slow, conditions such as irritable bowel syndrome and inflammatory bowel disease can develop or become worse. Finding safe ways to regulate these movements has become an important area of research.
The researchers tested ferulic acid on intestinal muscle taken from guinea pigs. They found that the compound reduced muscle contractions triggered by several natural chemicals involved in digestion. The effect disappeared after the compound was removed, showing that it did not permanently affect the tissue.
Further experiments showed that ferulic acid reduced the flow of calcium into muscle cells. Calcium acts as a signal that tells muscles when to tighten. By limiting this signal, the compound reduced excessive contractions without directly blocking the receptors used by digestive hormones.
The findings suggest that ferulic acid may be especially useful for conditions involving an overactive bowel, such as diarrhea-predominant forms of digestive disease. However, the same effect could be unhelpful for people with constipation because slowing bowel movements further may worsen symptoms.
The researchers also cautioned that the laboratory experiments used higher concentrations than people normally obtain from food alone. Although levels inside the intestine may temporarily rise after eating foods rich in ferulic acid, clinical studies are needed before any health recommendations can be made.
Review and analysis: This study provides an interesting biological explanation for how a natural food compound may influence gut function. While the work was performed in laboratory models rather than people, it opens the possibility that future foods or supplements could help manage some digestive disorders in a safer and more targeted way.
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Source: Toho University.
