Thread by @CaloriesProper

"Only because a lot of stuff can toss you out of ketosis. Fiber, protein, sugar alcohols, even coffee"

what now? *smh*

fibre & coffee: nope
1/n

high protein: maybe in an energy surplus; less likely in a deficit
2/n

and any dose of sugar alcohols high enough to 'kick you out of ketosis' would cause violent diarrhea. Not all of 'em do this, but still, the dose would have to be ridiculously high to be on that list

if you want to avoid net carbs but still want something to sweeten cheap coffee (assuming you're going to pay for it in the end either way; either more expensive coffee, or inexpensive coffee + more sophisticated sweetener combinations), there are possibilities