Synopsis

Source of validity: Traditional
Rating (out of 5): 1

Watermelon has been traditionally used in various cultures, especially in parts of Asia, as a remedy for edema (fluid retention). Its use is primarily based on folk medicine and traditional practices rather than robust scientific validation. The rationale stems from watermelon’s high water content and its mild diuretic properties, which are thought to help increase urine output and thus reduce excess fluid in tissues. Traditional Chinese Medicine (TCM), for example, prescribes watermelon and its rind (known as “Xi Gua Pi”) to help clear heat and promote urination in cases of swelling.

From a scientific perspective, watermelon does contain citrulline, an amino acid that may promote blood flow and has some diuretic effects. However, there is a lack of high-quality clinical trials or strong scientific consensus supporting its use specifically for the treatment of edema. The evidence is mostly anecdotal or based on small preliminary studies, which do not meet the criteria for strong scientific proof. Therefore, while watermelon may be safely consumed as part of a healthy diet and may offer mild diuretic effects, it should not be relied upon as a primary or sole treatment for edema, especially in cases where the condition is severe or related to underlying medical issues such as heart, liver, or kidney disease.

In summary, the use of watermelon for edema is mainly supported by traditional use with limited scientific backing, meriting a low evidence score.

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