[throwaway743950]

The majority.

See https://en.wikipedia.org/wiki/Dihydrogen_monoxide_parody

Jokes aside, soda is typically loaded with sugar, but diet sodas don't seem as bad.

[swader999]

Aspartame though.

[PeterHolzwarth]

Aspartame is profoundly safe and there is no mechanism through which it could be unsafe in the human body.

[TheCleric]

I think there’s more and more research coming out disproving this. Aspartame’s flavor can cause insulin release from the pancreas which lowers your body’s insulin sensitivity.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7014832/

[trehalose]

Well, there's phenylketonuria. (That's not relevant to the vast majority of people, but it's an extremely important exception.)

[PeterHolzwarth]

Phenylketonuria is an inherited genetic disorder. Aspartame doesn't make a food unsafe to those who do not suffer from this genetic disorder any more than peanuts do for people who do not have nut allergies.

[RadixDLT]

stevia is the safest

[PeterHolzwarth]

Where has that been demonstrated?

Aspartame is one of the most ridiculously well-studied food additives known to humankind.