A vitamin B12 deficiency can lead to megaloblastic anemia, a condition characterized by a low number of red blood cells that are larger than normal ( Megaloblastic anemia can cause a variety of symptoms and side effects, including ( shortness of breath headache heart palpitations fatigue poor balance memory loss That said, being low in vitamin B12 doesnt always lead to megaloblastic anemia, and many people may only experience mild symptoms like fatigue ( Furthermore, while a deficiency in vitamin B12 may not cause weight gain, it can decrease energy levels and contribute to fatigue, making it harder to stay active and manage your weight
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The NIH Office of Dietary Supplements, citing Institute of Medicine recommendations, advises that it is advisable for those older than 50 years to meet their RDA mainly by consuming foods fortified with vitamin B12 or a supplement containing vitamin B12. This recommendation reflects the fact that 10 to 30% of older adults lose the ability to efficiently absorb naturally occurring B12 from food
B12 is not always the only factor, so our providers may check for iron deficiency, thyroid issues, or other causes of your symptoms during your visit
More research in this area is needed to further understand the effects of taking B12 if you have kidney disease