First off I recommend you get your glider on a staple diet like the Bml, tpg, or critter love. These diets are balanced and known for offering all the vitamins and minerals gliders need to be healthy.
Secondly, what gender is your glider? If they're male are they neutered? Unneutered males are going to smell strongly regardless of diet.
As far as I'm aware diet doesn't dramatically affect the glider smell, it's just apart of owning these guys.