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Your exposure to sunlight is limited. Because the body makes vitamin D when your skin is exposed to sunlight, you may be at risk of deficiency if you are homebound, live in northern latitudes, wear long robes or head coverings for religious reasons, or have an occupation that prevents sun exposure. You have dark skin.
But many people who avoid meat don't become deficient in vitamin B12. Many other foods, especially fish, contain vitamin B12. There are a couple of diseases that could cause low levels of vitamins D and B12. Celiac disease (gluten sensitivity) might cause vitamin and mineral deficiencies without specific symptoms. Crohn's disease could also cause both, but most people with Crohn's will have symptoms such as abdominal pain and frequent stools.