I don't think the Mayo Clinic specifically is saying artificial sweeteners are good for us, they just say the should be safe. Most of them are chemicals, if we hate taking meds, which are chemicals, then why would we want to use artificial sweeteners, which are chemicals also? Just a thought!
Stevia is not a chemical, it's a natural product from a plant. I am raising my own this year, have 2 plants as I type. I tried for years to lose weight and never could..the harder I tried, the more upset I became. Through it all I used Splenda, Equal, and Nutrataste/Nutrasweet. When I gave them up and only used Truvia, the weight started coming off. I will not go back to artificial sweeteners ever again.
Not all Stevia products are the same. Some have maltodextrim in them and that product isn't as good for us.
I'm glad artificial sweeteners do not seem to bother everyone, we should all be able to enjoy things we like.