Why would someone eat something that contains almost no nourishment
To enjoy the pleasure of food without contributing as much to obesity? cf. the entire diet-foods industry.
That said, I've had some of these yam-like noodle products, and the ones I got tasted like hell and digested even worse. Hopefully a large dose of cellulose can fix that. I'd love to have some chee cheong fun with the majority of calories coming from the sauce and meats!
You need either carbs or fat just to survive.