How common is b12 deficiency in vegans?
Similarly, it is asked, how many vegans are b12 deficient? In one study, vitamin B12 deficiency affected 86 percent of all vegans. Vitamin B12 deficiency is serious and can cause anemia, nerve damage, neurocognitive changes, and, over time, paralysis—all problems that you don't need. Fortunately, vitamin B12 deficiency can easily be prevented.