Recently someone told me that some are really bad for your liver and in large amounts not healthier than large amounts of sugar.

I haven’t had time to look up their sources, but it was a professor at uni who told them. Do you have any insight that I might be lacking?

Now I am not interested in stuff like the bogus aspartam rat studies, those weren’t any good.

I mostly believe that most artificial sweeteners are not very unhealthy and thus miles better than sugars. So drinks or food sweetened with it should be good imo.