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People may be deficient in vitamin B12 if they dont eat animal products, or if their body does not absorb it well naturally
However, researchers do not know if the effects of obesity can cause a reduction in B12 levels or if reduced B12 levels may be a contributing factor to obesity
What Does the Research Say
Individuals who have had gastrointestinal surgery, such as weight loss surgery, may also have fewer cells through which to secrete stomach acid and intrinsic factor, inhibiting B12 absorption
A blood test tells you where you actually stand
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