Vitamin B12 deficiency symptoms can show up in anyone; however, vegetarians, elderly and malnourished people are the most susceptible. B12 deficiency is a common occurrence in vegetarians due to the fact that animal-derived products are not part of their diet.
According to Harvard Health, Vitamin B12 is only found in animal-derived products such as meats, dairy, poultry, eggs and fish. Elderly and individuals who suffer from stomach acid issues may also suffer and exhibit vitamin B12 deficiency symptoms. As people age, there is a lack of stomach acids in the human body that makes absorbing vitamin B12 difficult. People who take medications to aid and suppress stomach acids due to heartburn issues are also at risk. Recognizing Vitamin B12 deficiency symptoms are crucial, where as nerve damage and other serious disorders may develop.