Low-carb, low-fat bagel-like microwave bun. More information here:
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Please note that I make no health claims and no nutritional claims. There are enough alternologists and quacks on the Internet already and I have no intention of joining them.
I sincerely encourage you to talk to an actual medical doctor or registered dietitian before making any health- or nutrition-related decisions.
If I made any mistakes in this post, please *do* feel free to point them out in the comments.