Studie kopplar lägre normala B12-nivåer till hjärnförändringar

22 maj 2026

Rapporterad av AI

En studie från University of California San Francisco har kopplat lägre, men fortfarande normala, nivåer av aktivt vitamin B12 till långsammare tankeprocesser och skador på vit substans hos friska äldre vuxna. Forskningen, som publicerades i Annals of Neurology 2025, tyder på att nuvarande riktlinjer kan missa tidiga neurologiska risker. Forskarna undersökte 231 deltagare med en medelålder på 71 år.

Studien fokuserade på äldre vuxna utan demens eller lindrig kognitiv svikt. Deltagarna hade en genomsnittlig B12-nivå i blodet på 414,8 pmol/L, vilket är långt över det amerikanska minimivärdet på 148 pmol/L. De med lägre aktivt B12 uppvisade långsammare bearbetningshastighet och fördröjda visuella responser efter justeringar för ålder, kön, utbildning och kardiovaskulära risker.

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Studie kopplar lägre normala B12-nivåer till hjärnförändringar

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