The bottom line on diet soda vs. regular soda
Researchers have noted that there are limitations to their findings on diet soda. For example, people struggling with their weight are more likely to drink diet soda rather than regular soda. And just because there’s an association between diet soda and a negative outcome, that doesn’t always mean diet soda is the cause—it means more study is needed and to be cautious until researchers discover more.
In the meantime, if you simply can’t give up soda but you’re gaining weight, it"s reasonable to switch to diet soda; studies have shown that people who choose diet soda over regular soda can curb weight gain. Better yet: Trade in your diet drink for water, milk or tea instead. For people on a low- or no-carb diet, such as the keto diet, diet soda may be technically acceptable, though it doesn’t support the overall health objectives keto diets are trying to achieve.