Sure they're not healthy for you, but neither is the stress you carry when you spend time doing things you hate. All of these things are better with donuts:
Math class
Doing the laundry
Visits to the dentist
Posing for headshots
Running on the treadmill
Handwriting thank you letters
If you think I'm full of hyperbole, you're wrong and I'm not the only that feels this way.
"The good thing about donuts is that they make everything in the known and unknown universe better whether or not you believe it."
— Neil deGrasse Tyson