Anemia, fatigue. weakness, constipation, loss of appetite, and weight loss are all signs of a B12 deficiency, which becomes more common as you age.
Four ounces of fish and about 6 ounces of beef provide more than the daily recommended 2.4 micrograms (mcg), but eating dairy products such as cheese, eggs, milk, and yogurt will give your B12 levels a boost, too.
Source: Consumer Reports on Health November 2017 says Marvin M. Lipman, M.D., CR’s chief medical advisor
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