When the body is unable to absorb vitamin B12, a low red blood cell count occurs within the body. This is dangerous to our nervous system because it leaves the body unable to send proper signals. Those with pernicious anemia are missing a protein in their stomach called intrinsic factor that helps with the absorption of vitamin B12. Many need to supplement their diets with vitamin B12, or even have B12 injections. Consider eating foods that contain B12, such as meat products and eggs. B12-fortified foods and nutritional yeast are suitable for people following vegan or vegetarian diets.

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