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Vitamin B12 deficiency is more common in people who follow a plant based or vegetarian diet, in people who do not produce intrinsic factor, or those where the intrinsic factor is not able to mix with the food such as after bariatric surgery

10.1292/jvms.57.599 [DOI] [PubMed] [Google Scholar] 73.Mazur-Bialy A, Buchala B, Plytycz B
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The result is that the dog becomes deficient despite eating, which explains why weight loss and digestive symptoms persist even when the diet appears adequate

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