That is often claimed, but afaik unproven. And calories not present in your stomach cannot get metabolized.
A more realistic concern with sweeteners is that they may do damage to your guts microbiome. Xylit, Erythrit and Stevia do not belong to these. Guts are today understood to form two thirds of our immune system. High system relevance, I would say!
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If you feel nuts, consult an expert.
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