I’m not sure because I think more studies need to be done.
What I do know is I never liked diet coke or anything with artificial sweeteners. Never drank them. But when I got cancer I craved it. During chemo it was the only thing I could drink without issue. So there’s that.
I let my kids, 8 & 9 watch his videos every once and a while. Out of most of the YouTubers out there he is the least problematic iny opinion. For the most part though I only allow educational stuff on YouTube with the occasional fun channels. Snake Discovery and anything about guitars are huge around here.