The primary issue requiring management is that of the glucose cycle. In this, glucose in the bloodstream is made available to cells in the body; a process dependent upon the twin cycles of glucose entering the bloodstream, and insulin allowing appropriate uptake into the body cells. Both aspects can require management. Another issue that ties along with the glucose cycle is getting a balanced amount of the glucose to the major organs so they are not affected negatively.
Imagine our bodies to be a sugar bowl. A bowl of sugar. When we are young, our sugar bowl is empty. Over decades, we eat too much of the wrong things – sugary cereals, desserts and white bread. The sugar bowl gradually fills up with sugar until completely full. The next time you eat, sugar comes into the body, but the bowl is full, so it spills out into the blood.