THE CLAIM: Drinking flat soda can ease an upset stomach.

THE FACTS: It is not often that a soft drink is seen as medicinal. But when it comes to stomach distress, many people view a cup of flat soda as just what the doctor ordered.

The quick and popular remedy — usually in the form of cola, ginger ale or clear sodas — is said to help settle the stomach with its slight fizz and replenish fluids and glucose lost by vomiting and diarrhea.

But research shows that may not be a great idea. In a recent study, British researchers conducted a review of the medical literature going back to the 1950s in search of scientific evidence supporting the claim. They found none. The soft drinks, the authors found, contained very low amounts of potassium, sodium and other electrolytes.

THE BOTTOM LINE:

Flat soda, a popular remedy for upset stomach, may do more harm than good.