The answer to this question is deceptively simple. So simple in fact that billions of dollars are spent every year in this country trying to exploit the difficulty people have in accepting the correct answer.
The correct answer is: Consume fewer calories than you expend.
And exercise, while good for your heart and muscle tone, really doesn't help all that much with actual weight loss.
For example, jogging consumes about 413 calories per hour. A bean burrito has about 450 calories.
So, you can jog for an hour. Or you can skip the burrito. The effect is about the same.