I should be helping my character get out of her jam (on the run, doesn't know who she is, people want to kill her), but of course I find myself looking up pernicious anemia on the Internet instead. My grandfather had it. And I read this: "Dr. William Bosworth Castle performed an experiment whereby he ingested raw hamburger meat and regurgitated it after an hour and subsequently fed it to a group of ten patients. A control group were fed un-treated raw hamburger meat. The former group showed a disease response whereas the latter group did not. This was not a sustainable practice but it demonstrated the existence of an 'intrinsic factor' from gastric juice."