Here is a good video explaining it in more detail: https://youtu.be/dBnniua6-oM
Most people shouldn't be taking glucose. People should get their energy from food so that they get the nutrients and fibre with it. For most people taking glucose means either you'll get too much energy (and get fat) or not enough nutrients from real food.
On top of that it causes a strong insulin response which will decrease insulin sensitivity.
Fructose isn't good for you (or sucrose 50% fructose, high fructose corn syrup 42%-65% fructose etc) https://www.youtube.com/watch?v=dBnniua6-oM
But its sweeter than glucose; and has side-effects like switching of appetite suppression and prolonged exposure does similar damage to the liver as alcohol. Glucose doesn't do that.