I think the goal was to use the least amount of sugar possible. Typically liquefied products have tons of sugar and perhaps even preservatives.
You can use that if you wish but the risk is fat and unhealthy glider in a year.
These critters can live so long and their bodies are so tiny that the only real medical treatment one can give them is prevention from the beginning. So people can get a little crazy with their diet plans to try to get their critters to be healthy as long as possible.