Gongguan is far from Donghu...
Surely you are not tethered to Neihu District. Just hop on the 278. It's a long ride but eventually you'll wind up in Gongguan.
I think the solo joints are much better than the chains. Don't get me wrong, the Santa Cruz/Uni-President organic shops are fine, but they can't hold a candle to the one I mentioned in the above post. These are grocery/market type establishments, mind you, not technically restaurants.
As for restaurants providing healthy choices, I'm down with that. But Mister Donut is a donut shop. It's more like a bakery than a restaurant, so I think it might be exempt from the discussion. Come to think of it, they do offer a Japanese green-tea style ring donut. That may be the one Doc is referring to there. I bet it's as healthy as a lot of the night market/street vendor fare they cook up in the adjacent alleys...
For some reason, the museum of sewer pipes just doesn't bring the crowds in like you'd think it would.