Forgot to add a couple of links:
Achlorhydria associated with pellegra (niacin deficiency):
http://en.wikipedia.org/wiki/Achlorhydria#Causes
Paul Jaminet’s 25lb weight loss due to scurvy:
http://perfecthealthdiet.com/category/nutrients/vitamin-c/
It doesn’t say how many calories he was consuming, but I’m guessing it was more than 1800! :)