DiploLife has an interesting post about the Foreign Service 15. It is, according to DiploLife, "the typical pounds gained when leaving D.C., on R&R in the U.S., and now I have discovered it can also occur when leaving an overseas post."
I have never heard it called that, but I have certainly experienced it. I would add to his list of times you gain them any time you work on one of the Watches here at Main State. It is not a case of "this may be the last time I get to eat this," but it certainly is a need for extra energy. And in the Operations Center, you can find all the junk food your heart desires on the food trough.
Do you have the foods you have to eat? I know I do! I think I have gained weight every time I came back to the states from overseas or when I was about to leave. When I was in Jerusalem, I made a two-week trip home for some training about a year into my tour. I found my first Starbucks on the way to the baggage claim in New Jersey and got a ginourmous strawberries and creme frappachino. And I ate bagels every day and nearly cried because you can't get good bagels in Jerusalem (yeah, I know, I didn't think that made sense either). And BACON. Any time I got out of Jerusalem, I wanted bacon on EVERYTHING. Turns out, it is not so good on ice cream.
I also eat Arby's roast beefs and of course you have to have a jamocca shake with it. And good mexican. And Outback at least once.
And sushi...though really, I eat sushi at least once a week, not counting the cafeteria sushi, because you just never know if this is the last time you will get to eat it.