Interesting question Dave, I guess a lot of us have used food to cope with stress, which is how come we are where we are.
Just trying to think what I do now.
Main one is 'count my blessings'. Sounds really old and grannyish, but I can always get to 10 and I'm always smiling before I do.
Try to picture my small place in the universe and my even smaller problems - gets most things back into perspective.
Try to remember inboxes will always have things in, even when I die, so don't stress trying to empty it - it'll still be there tomorrow.
Look out of the window or go for a quick walk - I'm lucky, I have a good view from my office and I can get outside legitimately, as the buildings in three bits, so I go and 'see someone'.
And I do still use food, its just now its almond muffins or brazil nuts, not doughnuts. Hey, old habits die hard!
That provoked some deep thinking - nice one Dave.
Take care, Jay