Vitamin B1 Deficiency: The Neglected Nutritional Crisis in Nigeria

A Deficiency That Hides in Plain Sight

Thiamine (vitamin B1) deficiency — causing conditions known as beriberi and Wernicke's encephalopathy — is catastrophically underdiagnosed in Nigeria. Despite being largely a historical problem in high-income countries, thiamine deficiency remains a real risk in Nigeria due to dietary patterns, cooking practices, and certain medical conditions.

Who Is at Risk in Nigeria

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• People who consume polished white rice as a staple — milling removes 80% of thiamine; multiple daily portions with no compensatory sources creates risk over time
• Regular alcohol consumers — alcohol dramatically impairs thiamine absorption and increases requirements; most alcoholics become thiamine-deficient
• Pregnant (see our antenatal care guide) and breastfeeding women — requirements increase significantly; deficiency in nursing mothers causes infantile beriberi in their babies
• People with chronic digestive illness — Crohn's disease, prolonged diarrhoea, and bariatric surgery impair absorption
• HIV patients on antiretroviral therapy — some ARTs affect B vitamin metabolism

Symptoms of Deficiency

• Wet beriberi: Heart failure, swollen legs, rapid heartbeat — the cardiac form
• Dry beriberi: Peripheral nerve damage — tingling, weakness, pain in hands and feet
• Wernicke's encephalopathy: Confusion, eye movement abnormalities, unsteady gait — a neurological emergency requiring IV thiamine

Testing and Treatment

FXMed includes thiamine status assessment in our comprehensive nutritional panels, particularly for patients with risk factors. Repletion is highly effective when deficiency is caught early — often producing dramatic improvement in symptoms within days. Prevention through dietary diversification and appropriate supplementation is part of our nutrition counselling service.