Be careful with this one. There was once a war. A war between artificial sweeteners. Scientists and politicians were bought. All sides went dark, spreading fear, uncertainty, and doubt that persists to this very day.

It's probably fine at any sane level. It takes so little to make things sweet and the metabolic products aren't a problem at low levels (you're already getting them from other natural sources).

I wouldn't eat a pure spoonful a day. A few diet drinks won't hurt you.

The dose makes the poison.