Hi Jawad, welcome to the forum. Supposedly it sounds like a simple solution: Eat more sugar, and take more insulin to counteract it. However, unfortunately it is not nearly that simple.
Firstly, as you take more insulin, over time your body becomes resistant to it, so it loses it's effectiveness. (To begin with, type 2 diabetics actually produce a lot more insulin than non diabetics, but they are so insensitive to it that it has little effect on their blood sugars. This is why they take medication such as metformin, which increases their insulin sensitivity).
It is well known that insulin affects blood sugars. What is less well known is it's other functions in the body. Insulin is the hormone that allows the body to store fat. Constantly high levels of insulin in the body will most likely lead to weight gain.
The other thing that insulin has a big effect on is hunger levels. Again, the more insulin you take, the hungrier you are likely to be. I used to find I could go through a domino's pizza, top it off with half a tub of Ben and Jerry's, probably with some potato wedges on the side too, and not scratch the surface of my hunger.
The other obvious risk is of taking too much insulin, and having a hypo. Injected insulin does not work as quickly as insulin produced in non diabetics. What you would likely find by eating a load of sugar and giving yourself a load of insulin is this: You eat a giant chocolate bar, and give yourself a large dose of insulin. Before the injection can take effect, your blood sugars rise to dangerously high levels. Maybe you test a bit later, and worry that they have gone high, so you give yourself more insulin. Then, later on, your blood sugars crash, meaning you have another snack to combat the hypo. Low blood sugars make most people ravenous, so you will likely eat too much, and go high again. And the cycle continues. It's what some people call the diabetic roller coaster.