Vegemite contains folic acid. Folate is good for you. To quote from The Ohio State University Extension Fact Sheet:
Folate, a water-soluble vitamin, helps the body form red blood cells and aids in the formation of genetic material within every body cell.But bizarre and useless U.S. food laws say that the only foods that may contain added folic acid are breads and cereals.
Therefore Vegemite is banned, as of now.
Um. Did you know strawberries and asparagus are good sources of folic acid? Liver? Sunflower seeds? Beans? Better not add any of those to your menu.
Pshaw. I find it ridiculous, and I'm going to go have a contraband sandwich. I figure I can get this jar to last me a little while longer; already, it's been in my pantry for — oh, gosh — years?
Then I'll probably have to switch over to Marmite, if that's still allowed.
Man. Sometimes I'm just embarrassed to be American.
UPDATE: Or maybe this whole kettle of concentrated autolyzed yeast extract is just one big misunderstanding. Thanks to a tip at Cooking With Amy, I clicked through to this story, which concluded that it is the Kraft corporation that has discontinued importing Vegemite because of a misreading of the FDA regulations. If that's true, the bottom line is still: No Vegemite.