Is FUT2 useful for Schlaf?

Based on current evidence, FUT2 is not useful for assessing or improving sleep. The FUT2 gene determines secretor status and influences gut microbiota composition, but a direct, causal link to sleep quality or disorders is not established. The provided context contains no studies or markers connecting FUT2 to sleep. While the gut-brain axis may play a role in sleep regulation, attributing sleep issues to a single genetic variant like FUT2 is not supported by robust evidence. Consumers should be cautious of marketing claims that overstate the relevance of such genetic tests for sleep. For sleep problems, evidence-based approaches like sleep hygiene, cognitive behavioral therapy, and medical consultation are recommended. The evidence grade for FUT2 and sleep is 'unclear' due to lack of data.