Because if consume too much, it can cause many diseases, such as diabetes which damages one person's health....

Here, people are taught to eat or drink less sugar- or fructose-added foods and drinks. See attached table. It shows how much white sugar in a can of a specific drink.

Thanks Dr. Yuan-Yeu Yau

Thanks Dr. Jakob Leskovec

High sugar in diet leads to many diseases among them is diabetes meliteus, which is serious disease that affect on all body system. Our prophet Mohamed peace up on him tell us to avoid much sugar and salt

If possible point out the natural food, fruits and others having less sugar and high fructose content for eating & drinkings.

High sugar levels could alter basic metabolic activities

This link is very useful

https://recipes.timesofindia.com/articles/food-facts/7-reasons-why-sugar-is-called-the-white-death/affects-muscle-protein/photostory/60388572.cms

Very important