;5. Vitamin B12: Numbness, Fatigue, Swollen Tongue, and More;Vitamin B12 aids the production of red blood cells and DNA, and also improves neurotransmitter function, according to the NIH. Vegetarians and vegans may be at particular risk for vitamin B12 deficiency because plants don’t make the nutrient, and people who’ve had weight loss surgery may also lack B12 because the procedure makes it difficult for the body to extract the nutrient from food, according to Harvard Health Publishing.

 

 

 

 

 

– “;5. Vitamin B12: Numbness, Fatigue, Swollen Tongue, and More;Vitamin B12 aids the production of red blood cells and DNA, and also improves neurotransmitter function, according to the NIH. Vegetarians and vegans may be at particular risk for vitamin B12 deficiency because plants don’t make the nutrient, and people who’ve had weight loss surgery may also lack B12 because the procedure makes it difficult for the body to extract the nutrient from food, according to Harvard Health Publishing.”