What is the most likely reason for the development of a vitamin b12 deficiency ?

Vegans are especially at risk for B12 deficiency due to the lack of the vitamin in their diet. Vegetarians are also at risk but due to less strict dietary constraints their chances for B12 consumptions are drastically higher than a vegan's. B12 is found primarily in meat, eggs and dairy products.

Depends on which disease, but as a general rule eat healthy. many vegetables.                                                        hope my answer has come to your . you for posting your question here in we hope to answer more of your questions and inquiries soon. have a nice day ahead! : )     (p.s mark as brainliest if )

What are the items? ?