Scurvy Campaign had a lack of vitamin C in their diet which caused many of the soldiers to contract scurvy. It is thought that scurvy is one of many reasons that the Allied attack on Gallipoli failed. Vilhjalmur Stefansson, an arctic explorer who had lived among the Inuit, proved that the all-meat diet they consumed did not lead to vitamin deficiencies. He participated in a study in New York's Bellevue Hospital in February 1928, where he and a companion ate only meat for a year while under close medical observation, yet remained in good health. In 1927, Hungarian biochemist Szent-Györgyi isolated
Vitamin B12 deficiency be considered only if blood testing is inconclusive. The Schilling test was a radio-isotope method, now outdated, of testing for low vitamin B. The National Institutes of Health (NIH) has found that "Large amounts of folic acid can mask the damaging effects of vitamin B deficiency by correcting the megaloblastic anemia caused by vitamin B deficiency without correcting the neurological damage that also occurs", there are also indications that "high serum folate levels might not only mask vitamin B deficiency, but could also exacerbate the anemia and worsen the cognitive symptoms associated with vitamin B deficiency". Due to the fact