I think it may have been mentioned before...but if not...if you are feeding blended smoothies...while there is a variety in the mix, the gliders will taste the same thing every day until you make a new batch which can make gliders picky eaters.
I know I don't like to eat the same thing everyday. If I did that, food would be very boring!
Food should really be an 'enrichment' for captive animals, so anything they can forage for or if they can pick up chunks and carry it off to eat somewhere else like they would in nature. I offer things cut up in different sizes, some things are served cooked til soft like sweet potatoes, apples, peaches and butternut squash. You can put cubes on a skewer (found in the pet bird/food section), place bowls at different heights and hide some of their dinner where they have to forage for it a bit.
So if you can make it fun, different and interesting, you not only are adding activity, you are adding a rotation of nutritional elements.
I feed one fruit and one veggie a nite so I can see who eats what, who likes what and I often find a new fruit, veggie or treat for them to check out.
It's part of the Glider-itis I have...always on the look out for something for the gliders!