Not meaning to be rude, but, several of us use the Darcy diet with great success. I have used it for several years and never had a sick glider. Also it does not cause gliders to be fat. My gliders all have the same size cages, ( 55" tall) all have the same wheels, same toys, and the same out of the cage playtimes. Some are fluffy and some are tiny. If it was the diet, then all my gliders would be big.
Diet is VERY important. I found out how important when I did change my diet last year for 1 1/2 months and lost 5 joeys, their mom's could not make enough milk.
I changed back to Darcy's and have not lost another one. BTW: I had had 26 happy, healthy joeys before the change. These were 5 joeys from 3 different moms, who had all had healthy joeys prior. My vet is the one that told me to go back to Darcy's ASAP to save the rest of my joeys.
There is no diet that is perfect for all gliders. No matter how great a diet is, if your gliders won't eat it, it won't work. It's up to you and your vet as to what the best diet for YOUR gliders is. Whatever diet you chose, please follow the full intructions, don't just use part of this one and part of that. These little one's systems are just to delicate to mess with.