Exercise may not boost obese teens' metabolism

No surprise here.

A few months of moderate aerobic exercise may not rev up obese teenagers' ability to burn calories, even though it may increase thinner teens' ability to burn dietary fat, new research suggests.

In a study of 28 obese and normal-weight teenagers, researchers found that after 12 weeks of treadmill and exercise-bike sessions, the heavier teens showed no changes in their bodies' calorie- and fat-burning throughout the day.

Their thinner peers likewise showed no changes in daily calorie expenditure.

First, you need to train to improve fitness, exercise will almost never work.

Second, resting metabolism is upregulated when you burn more Calories than previously. Cardio exercise will almost never do that.

Third, the better one gets at aerobic "exercise," the fewer are the Calories that get burned. This is due, among other reasons, to increased efficiency. So more, in this case, is not necessarily better for the intended result.