Lethargy Muscle weakness Mood swings Memory loss Tingling in the fingers and toes Weight gain Though B12 is found in many different foods, including meat, eggs, and fortified grains, it may be difficult to get enough of this nutrient from your diet, especially if you are following a specific diet for weight loss
serine hydroxymethyltransferase, MS
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Older adults are more likely to have a vitamin B12 deficiency because they're prone to not having enough hydrochloric acid in their stomachs
People taking metformin, the common diabetes drug, are known to develop B12 deficiency as well, and people who avoid animal products can be deficient