Just to point out, this thread is 2 years old
as for the rest of it, nutritional disorders are fairly known, novice keepers are constantly asking same questions and run into the same problems and it is why it is important to keep telling them the proper way of doing things, helping save one frog at a time.
obesity is a big problem in north america in general, in people and in their pets. Frogs are different. Actually obesity in not that common in guinea pigs unless they are fed commercially made food.