Dear LFTP letter 1: Karen and the potluck brownies

• What is a good way to tell coworker Karen to stop taking too much food at the potluck?

The reader opens Dear LFTP with a letter from a small-company employee: a coworker named Karen takes far too much food at the office potluck — nibbling brownies, then eating two and taking five more. The hosts debate how to tell her, land on 'bunion face' as her nickname, read secular's advice for comparison, and close with a toffee/Heath riff.