Most People Are Deficient In This 1 Vitamin And You've Probably Never Heard Of It
BuzzFeed
Last updated: May 25, 2026
Thiamine, or vitamin B1, is a water-soluble nutrient essential for energy metabolism and nerve function. It helps convert carbohydrates into usable energy for the body and brain, making adequate intake important for overall cognitive and physical health.
- A September 2021 Cells review found thiamine deficiency rates from 20% to over 90% across populations, with modern lifestyles and medications hindering absorption. Deficiency can cause fatigue, irritability, poor concentration, muscle weakness, and nausea; advanced stages include numbness, tingling, or blurred vision. Worsening deficiency can cause numbness, difficulty walking, and, in rare cases, Wernicke encephalopathy, a neurologic emergency. Groups at higher risk include diets high in processed carbs, chronic alcohol use, malnutrition, GI disorders, or bariatric surgery; increased metabolic demand (illness, pregnancy) also raises risk. Diabetes and older adults are at higher risk; some medications can slow absorption. Food fortification helps maintain adequate thiamine; severe deficiency is rare in developed countries. Early recognition and medical consultation are important.
- Objectivity: The article presents expert opinions and notes that thiamine deficiency symptoms can mimic other conditions, underscoring the need for professional evaluation.
- Clarity and tone: Information is conveyed in concise, neutral language to highlight the nutrient's importance and practical steps to maintain adequate intake.
