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Patients are asked to drink barium sulfate before an X-ray examination of the stomach because X-rays can pass through soft tissues like those in the stomach without producing a clear image. Barium sulfate is a radiopaque contrast agent, meaning it does not allow X-rays to pass through. When ingested, it coats the lining of the stomach and intestines, providing a stark contrast on the X-ray image. This contrast enhances the visibility of the stomach’s structure and any abnormalities, allowing for a more accurate diagnosis. The procedure helps in identifying issues such as ulcers, tumors, or other gastrointestinal conditions.