Inadequate secretion of intrinsic factor, resulting from lesions that destroy the gastric mucosa (which can be caused by ingestion of corrosives, extensive tumors, and conditions associated with gastric atrophy, such as multiple sclerosis, certain endocrine disorders, iron deficiency, and subtotal gastrectomy) Structural lesions leading to vitamin B 12 deficiency, including regional ileitis, ileal reactions, and malignancies Competition for vitamin B 12 by intestinal parasites or bacteria
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However, certain individuals cannot absorb enough through diet alone, even with adequate intake
Researchers confirmed this through knockout studies in mice, where animals lacking beta-3 adrenergic receptors showed zero response to AOD 9604, proving the peptide works specifically through this receptor pathway in adipose tissue