What is the worst fizzy drink for your health?

The worst fizzy drink for health is often considered regular Coca-Cola due to its high sugar content. According to the USDA Nutrients Database, a 12-ounce can of regular Coca-Cola contains 39 grams (approximately 9.75 teaspoons) of sugar, which significantly exceeds the American Heart Association's daily recommended limit of added sugar for men (36 grams) and women (25 grams). High consumption of sugar-sweetened beverages like regular Coke has been associated with various health concerns, such as obesity, insulin resistance, type 2 diabetes, heart disease, and tooth decay.