Beet (Beta vulgaris) is commonly used to support digestive health, including the management of constipation, primarily due to its high fiber content. Dietary fiber is well-established in the scientific literature as a means to increase stool bulk and promote regular bowel movements, which can help relieve constipation. One cup of boiled beets contains about 3-4 grams of dietary fiber, which consists of both soluble and insoluble types. Insoluble fiber in particular is known to add bulk to stools and speed up intestinal transit time.

While there are no large, direct clinical trials specifically investigating beetroot for constipation in adults, the general role of fiber-rich foods in constipation management is supported by guidelines from major health organizations, such as the American Gastroenterological Association. Furthermore, beets also contain compounds like betaine, which may support liver and digestive function, though evidence for direct laxative effects of these compounds is limited.

In summary, the use of beet for constipation is scientifically plausible due to its fiber content, even though there is a lack of clinical trials focusing explicitly on beets. Its role in constipation relief is largely extrapolated from broader research on dietary fiber. Therefore, the evidence is moderate but not beet-specific, justifying a rating of 2 on the evidence scale.