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To increase the amount of vitamin B12 in your diet, eat more foods that contain it, such as: Beef, liver, and chicken Fish and shellfish such as trout, salmon, tuna, and clams Fortified breakfast cereal Low-fat milk, yogurt, and cheese Eggs Your doctor might recommend that you also take a vitamin B12 supplement
Gastric Bypass Surgery: Procedures that remove or bypass parts of the stomach and small intestine dramatically reduce the body's ability to extract B12
Huang YC, Li YC, Chen TJ
Mol Immunol (2017) 91:13444
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