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The extra gas in carbonated water creates more pressure in your stomach, increasing the chances that your stomach will regurgitate contents upward. Some carbonated waters also include natural flavorings, such as lemon or lime, which can increase acidic content, making the heartburn worse.
It's true: Belly fat is the worst kind of fat -- and not just because of the way it looks in beach pictures. Deep belly fat (the kind that makes for a classic beer belly) actually churns out proteins and hormones that make all kinds of bad things worse, including LDL (lousy) cholesterol, blood sugar, blood pressure, and triglycerides. It's also a player in insulin resistance and red-alert-causing inflammation.