I don't think there's any such thing as nitrate-free bacon regardless of the sugar content. The bacon that has no sodium nitrate added tends to use sea salt or celery salt instead, which contains natural nitrates. A bacon without nitrates of any kind would rot. Some people thing the sodium-nitrate-added kind might actually be better, because the quantity of nitrates can be more carefully controlled to hit the sweet spot between too little (food will rot) to too much (not healthy).
Zone diet on and off for several years....worked, but too much focus on exact meal composition
Primal since July 2010...skinniest I've ever been and the least stressed about food