Work out so you could eat whatever you want whenever you want. I consume several muffins (40g) daily, put a shitton of sugar in my tea and coffee. I also happen to love potato chips, which I consume in copious amounts. Still fit as heck.
I would think it's still not really healthy to load up on sugar even if you burn all those calories off. Overdoing it on sugar has some negative effects over the long haul and you gotta mix in some healthy foods too. I try and keep intake below 40 grams/day. The less the better.