They found adults who drink one or more sodas a day — diet or regular — had about a 50 percent higher risk of metabolic syndrome — a cluster of risk factors such as excessive fat around the waist, low levels of “good” cholesterol, high blood pressure and other symptoms.

“When you have metabolic syndrome, your risk of developing heart disease or stroke doubles. You also have a risk of developing diabetes,” said Dr. Ramachandran Vasan of Boston University School of Medicine, whose work appears in the journal Circulation.