I love this topic
and first I have questions
How old are the gliders and how much do they weigh?
When it comes to weight there are a lot of things that can factor in, here's a few to consider...
gliders much like humans come in different sizes, weights and even body shapes. It is not uncommon for one to be heavier than the other.
Gliders don't really hit a plateau on their weight until they are between 1 and 2 years old, up until then they are still developing and filling out. Usually by 2 they will level off and be at their adult weight which should stay pretty consistent within a few grams up or down.
It is fall..... colder weather is coming and some gliders gain a little weight in preparation for winter and torpor. When gliders gain this type of weight it is usually in their chest area, the boobs or moobs are safe fat storage in case their body goes in to torpor, the fat is their reserves that the body utilizes to stay alive. Boobs/Moobs are not indicators of being overweight.
Every glider has their own role in the colony, ones job may require more activity than another gliders job... so one may use the wheel more than another.
Often we think gliders are over weight when in actuality they really aren't. Same with underweight. Especially owners in the states, our standards for gliders are quite high...
I've got some gliders ( adults ) that are petite and are barely 70 grams and I've got others that are 164-178 grams and one girl that is around 180-190 grams, others with weights in between. The only one that I personally consider "overweight" is the last one and even she is healthy and isn't obese. She is a corn hog though
If you are really concerned start weighing them and keep a journal of their weights... it's a good habit to do anyways as weight loss can be an indicator of illness. Use a digital kitchen scale, weigh the gliders around 1 pm every time prior to any treats and well after their last meal. This will give the most accurate weights.
To really tell if a glider is over weight feel the patagium. If the patagium is smooth and thin the glider is not over weight regardless of what it weighs.
If the patagium is thick or feels "lumpy" the lumps are fat deposits, THEN the glider is overweight. Only then would I worry about the glider losing any weight.
When I first got my big girl I tried to get her to lose weight... I regulated what food that cage got, how many treats she got, and I worked with her to stretch and climb more........ she never lost a gram. The only time she has lost weight is when she had a neck wound and infection. She lost about 30 grams and looked great weight wise. Once she healed she gained it all back with no changes in diet or anything else. I've come to the realization that she is just a big girl and I don't stress over it anymore.