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On the other hand, if a vitamin B12 deficiency does occur, it is associated with several undesirable health risks, some of which are as follows: shortness of breath heart palpitations tingling or numbness in the extremities poor balance mood changes incontinence insomnia loss of concentration poor memory chronic fatigue Those who smoke cigarettes, consume excessive amounts of alcohol, or adhere to a vegetarian or vegan diet are at a greater risk of acquiring a nutritional deficiency than younger adults
Abstract Pregnant women in resource-poor areas are at risk of multiple micronutrient deficiencies, and indicators of low vitamin B-12 status have been associated with adverse pregnancy outcomes, including anemia, low birth weight, and intrauterine growth retardation
doi:10.1073/pnas.0308082100
doi:10.1136/bmj.325.7374.1202
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