Why do dieters drink diet Coca-Cola? Sure, it’s got zero calories and no carbs, but could there be something else going on? According to some experts, the caffeine in diet sodas can actually suppress your appetite and cause you to eat less, which would help with weight loss. Others say that artificial sweeteners affect your brain in such a way that you are less likely to crave sweets or salty foods. However it works, drinking a diet of Coca-Cola while trying to lose weight has its benefits—but be sure to enjoy it in moderation!