I have the same habits -- when I eat lunch alone at home, if I'm not at the computer I'll turn the TV on (ESPN or Food Network, usually), and when I eat lunch at work I need something to read (magazines or newspaper, usually -- right now it's mostly Time, at a previous bookstore job it was Publisher's Weekly, at the big media chain it was usually Sports Illustrated).

Not sure if I have any specific associations like that, though.