Also note that it is MUCH MUCH easier to not consume calories, than to burn them off later.

Its almost impossible to lose weight with exercise alone. If your eating too much now so that your overweight, if you start to work out you will be even hungrier, and it will be even harder to not eat, and that one soft drink takes like 2 hours of jogging to burn off.

Mathematically, the "best" way to lose way it to focus on cutting portions, eating less calorie dense foods, and then adding in lighter exercise and working your way to harder exercise as you are able to handle the cravings. of course willpower is hard to just create.