Yes, sodo water does cause acid levels to remain elevated in the stomach and worsen your stomach condittion. But ,being obese is the number one killer to make reflux worse because of what or how much is eaten. Also, the extra weight puts pressure on the stomach. Smoking and eating certain foods (such as chocolate and peppermint) tend to weaken the sphincter muscle. For some people, eating fatty foods and foods with a high acid content (such as citrus fruits) makes reflux symptoms worse.