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Profound vitamin B12 deficiency is a known cause of disease, but the role oflow or intermediate levels of B12 in the development of neuropathy and otherneuropsychiatric symptoms as well as the relationship of eating meat and B12levels is unclear. Here we use food-related internet search patterns from asample of 8.5 million US-based people as a proxy to B12 intake and correlatethese searches with internet searches related to possible effects of B12deficiency. Food-related search patterns are highly correlated with knownconsumption and food-related searches (Spearman 0.69). Awareness of B12deficiency was associated with a higher consumption of B12-rich foods and withqueries for B12 supplements. Searches for terms related to neurologicaldisorders were correlated with searches for B12-poor foods, in contrast withcontrol terms. Popular medicines, those having fewer indications, and thosewhich are predominantly used to treat pain are more strongly correlated withthe ability to predict neuropathic pain queries using the B12 contents of food.Our findings provide evidence for the utility of using Internet search patternsto investigate health questions in large populations and suggest that low B12intake may be associated with a broader spectrum of neurological disorders thancurrently appreciated.

Evidence from web-based dietary search patterns to the role of B12 deficiency in chronic pain