In 2012, a study from Harvard University found that people who drink only one can of soda a day dramatically increase their risk of chronic heart disease (CHD). Compared to participants who drank the least soda, those who drank the most were 20 percent more likely to have a heart attack. “Consumption of sugar-sweetened beverages was associated with increased risk of CHD and some adverse changes in lipids, inflammatory factors, and leptin,” the researchers concluded.