Drinking just one 12-ounce soda a day may increase the risk of Type 2 diabetes, a new study from Europe suggests. In the study, people who drank a 12-ounce sugar-sweetened soda daily were 18 percent more likely to develop Type 2 diabetes over a 16-year period compared with those who did not consume soda. And people who drank two sodas daily were 18 percent more likely to have a stroke than those who drank one; those who drank three sodas daily saw the same risk increase compared with those who drank two, and so on.