Attempting to substitute sugar with artificial sweeteners has been shown in studies to boost consumption of sweet and calorie-dense foods.
This is due to the fact that aspartame and other sugar substitutes do not provide the body with the same amount of energy as sugar. The proper number of calories aren't being consumed, yet the temptation to eat something sweet persists.
If you want to give up sugar, don't switch to sugar alternatives; instead, strive to minimize the amount of sugar in your diet. It turns out that it isn't all that difficult.