A Robot That Runs On A Sugar High

Digitalia writes: "Using a biological soup that mimics our stomachs, the gastrobot is the first commercial robot that "feeds" on organic matter to get its energy. Chew Chew, as it is called, takes a cube of sugar and turns it into enough energy to roll around for 15 minutes. I particularly enjoyed the creator's explanation as to why his bots aren't carnivores. Check the article out here." 15 minutes seems a pretty good run for a sugar-cube, but hasn't anyone explained the carbohydrates theory to this robot?