I am thankful for sucralose.
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Caffeine is a drug so saying "it feels like" is rather understating it.
It is hard to understand how aspartame influences the gut microbiota because this NNS is rapidly hydrolyzed in the small intestine. In fact, even with the ingestion of very high doses of aspartame (>200 mg/kg), no aspartame is found in the blood because of its rapid breakdown (29).