Can eating watermelon and drinking beer cause diarrhea?

Eating watermelon and drinking beer may cause diarrhea.

Watermelon is a common fruit in daily life, rich in nutrients such as sugars, amino acids, and vitamins. Regular consumption offers diuretic and anti-inflammatory effects and can promote intestinal motility to aid bowel movements. However, both watermelon and beer are considered “cold” in nature according to traditional Chinese medicine. Individuals with a weak constitution may experience gastrointestinal chilling after consuming them together, leading to gastric discomfort—such as gastric spasms and abdominal pain—and even diarrhea, electrolyte imbalances, and dehydration. Additionally, this combination may place extra strain on the kidneys and bladder, resulting in excessive fluid loss, reduced blood volume, inadequate perfusion, and consequent dizziness.

Moreover, the alcohol in beer typically irritates the gastric mucosa; chronic alcohol consumption may lead to gastric disorders, including diarrhea. Furthermore, for individuals with chronic conditions such as diabetes, consuming watermelon and beer together may elevate blood glucose levels, impairing glycemic control and adversely affecting overall health.