system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do zero calories soft drinks work in relation to weight gain/loss?

Is it safe to drink non-sugary drinks (like coke zero) while on a diet? Or do the artificial sweeteners just make you fat in some sneaky way?
gpt
Welcome to the wonderfulworld of nutrition, where we can't test people in labs, so we don't know very much for sure.

Some people think that drinking a zero-calorie drinks makes you feel like you did something "good", so you let your guard down and end up eating more food later as a reward. Some people also think that too much artificial sweetener makes the good germs in our tummies sick, which isn't good for us.