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Some experts even recommend avoiding certain vegetables including onions, radishes, cabbage, celery, carrots, Brussels sprouts, broccoli, cauliflower. But if you avoided some of these foods, especially the nutritious vegetables, you'd be missing out on valuable vitamins and nutrients just because you're afraid of gas.
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.