Low level of vitamin b12 and vitamin d can cause ibs with diarrhea or ibs diarrhea causes low level of vitamin b12 and vitamin d?

The latter...: Patients with severe symptoms of irritable bowel syndrome may develop vitamin b-12 deficiency due to problems with food intake, digestion and absorption. Some patients with ibs may not tolerate dairy products and meat products leading to less b-12 intake. Ibs also causes chronic diarrhea which leads to loss of other vitamins and minerals too.

Low B12: If you have low levels of b12- that needs to be investigated and treated. There is a cause for a low B12 level. Untreated it can lead to irreversible neurologic damage. While the cause can be dietary, there are more serious causes such as pernicious anemia- an autoimmune disease. So i suggest an investigation into why low b12.