[godshatter]

Diet sodas get a bad rap and for good reason, but I've been unable to stick with anything other than diet soda long term (though I've tried multiple times). I know that diet sodas can spike blood sugar in some people, but it doesn't break me out of ketosis when fasting. YMMV.

[m348e912]

Just my perspective, but I think diet soda certainly breaks a fast. I can see how it could potentially not affect ketosis, but as far as fasting goes, water & minerals are truly the way to go. I will also concede a true "water" fast makes the fast much harder, although I think that's part of the experience. It's not supposed to be easy.