Why am I CRAVING eggs??

In my nearly 30 years, I've never craved anything. Could never understand what was going on with folks who seemed almost half posessed, NEEDING a certain food. Well, for the past month, I have been fiending for eggs. I've never been a big fan of them, having had maybe 12 in the past 3 years, and none since last October. I finally broke Sunday and had an organic brown Sunny Side up. It was heaven. So of course I had to scrable one up. Not as good. Since then, the cravings somewhat subsided for a couple of days, but they've come back with a vengance. What's going on? Why do we crave stuff? Why eggs?? Any thoughts?

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