Do not eat foods that lie to your body.
This goes back to “eat real food”. It has been shown that artificially sweetened foods and beverages are not really associated with weight loss, and may actually go the other way. Why? The hypothesis is the psychology of rewarding one’s self later with higher-calorie food due to the (erroneous) perception of previously virtuous decisions. Another proposed mechanism is that fake sweets disrupt/fool our brain’s ability to gauge actually caloric content of foods.