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Last reviewed: May 16, 2026 Last updated: May 16, 2026 Written by: Jay Hastings , CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations

Table of Contents Why Gastric Sleeve Surgery Increases the Risk of B12 Deficiency Recognising the Symptoms of B12 Deficiency After Bariatric Surgery How B12 Deficiency Is Diagnosed and Monitored on the NHS Recommended B12 Supplementation Following Gastric Sleeve Surgery Dietary Sources of B12 and Their Limitations After Surgery When to Seek Medical Advice and Long-Term Nutritional Follow-Up Scientific References Frequently Asked Questions Why Gastric Sleeve Surgery Increases the Risk of B12 Deficiency Sleeve gastrectomy removes up to 80% of the stomach, reducing parietal cells and intrinsic factor production, which impairs B12 absorption alongside reduced gastric acid secretion and lower dietary intake

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