dsip johns hopkins Diversity Summer Internship Program for Undergraduates | DSIP Program Assistant (Academic Affairs-IDARE)
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5 Yang, W., Cai, X., Wu, H
Multiple pathologies are common and related to dementia in the oldestold: The 90+ Study

Here's the science
Neurology 2007;69:21972204

This can be due to having low levels of intrinsic factor in the digestive system, having a digestive condition, or following a plant-based diet