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Lack of Vitamin B-12 Leads to Weight Gain Somehow According to observational studies, people suffering from obesity or are overweight tend to have lower vitamin B-12 levels in their systems

Strict vegetarians who eat no animal products (vegans) need supplemental vitamin B 12 to meet their requirements

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[121] [123] Malabsorption [edit] Individuals with pernicious anemia do not have the ability to produce intrinsic factor

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