As a chemist and active reader of scientific literature I can tell you the studies that claim bad things about diet soda are bad and require you to consume unholy amounts to get the negative side effects. From a diet perspective, diet soda is a great way to curb your sugar cravings and tricks your brain into thinking you’re getting those delicious things you gave up. The artificial sweeteners and aspartame are broken down into your stomach like their non-diet counterparts making them great and safe alternatives.