How is artificial sweetener bad for you?

depends which sweetener it is. If it's aspertame then it's bad for you because when you eat aspertame it pickles your brain. If you're talking about splenda, it's bad for you because you are exposing yourself to a massive amount of chemicals that genetically alter the sugar (yes there is sugar in splenda) thus increasing your chance of cancer. Although there's no conclusive evidence to support that these artificial sweeteners are bad for you: we haven't had enough time to see their effects

When aspartame was put before the FDA to get approved, it was denied EIGHT times. FDA commissioner Hayes was appointed. He was for approval, despite what scientists had said. Hayes was later investigated for accepting gifts from FDA-regulated companies. Asparate's ingredient of methyl alcohol, turns into formaldehyde, which is toxic. High levels of phenylalanine can bring upon depression and increase chance of seizures. Sucralose can cause immune problems and reproductive damage.