Eating hamburgers while drinking diet beverages

For Americans, eating a hamburger while drinking a soda is as normal as the combination of soy milk and fried dough twists in China. Although tasty and convenient, the combination has a high calorie count. Amid growing obesity problems, many Americans have developed a habit of drinking reduced-sugar beverages referred to as "diet sodas," which contain 99 percent less of the calories in regular sodas. Hamburgers and french fries already contain a huge amount of calories, so what is the point of only drinking diet soda?