It is important to consider the science behind artificial sweeteners. American Heart Association and American Diabetes Association have cautioned against eating high levels of artificial sweeteners (via Harvard Health Publishing). According to HealthlineSome experts worry that artificial sweeteners could cause weight gain. The lack of long-term studies on sugar substitutes is part of the problem. Artificial sweeteners can also cause weight loss if they are used in place of calorie-heavy natural sweetness. It is a good idea, however, to limit artificial sweeteners from your diet. There is very little scientific evidence.
All of this said, there is not much evidence that artificial sweeteners can cause any health problems if consumed in moderation (via). Mayo Clinic). They are safe when consumed in moderation, according to many studies. You don’t need to worry about drinking diet sodas once a week. However, you shouldn’t drink them all day.