Unfortunately, when it comes down to who is eating how much of what and getting what percentage, we just do the best we can. It's kind of like when my husband feeds my kids breakfast and then they eat lunch at school. I have no idea if they ate how they "should" but I know they're healthy...if that makes sense. With gliders, their weights, coats and demeanor are good indicators of general health that you can physically see. If one starts gaining a lot, fast or if one seems to be losing weight, then you should be concerned. Lots of us have digital kitchen or postal scales that can weigh in grams and you can easily monitor weights that way if you're worried. I feed mealworms but I personally do not gutload them. Maybe someone else can answer that one.