The question is how to lose weight in a healthy way as a teenager. First off, it's important to recognize the fact that as a teenager your body is still going to be in a stage of growth as you have not fully matured and reached your mature weight or height.
Additionally as a teenager you may or may not be in the early or late stages of puberty. Remember, we all advance through puberty at different rates and different times thus affecting our weight loss or gain. For instance, if you haven't hit puberty yet once you do you will lose body fat and start to lean out and see more lean muscle. But back to the question how do you lose weight in a healthy way as a teenager.
When talking about weight loss we must remember that it's simply calories in vs. calories out. You want to burn more calories than you take in. So in order to lose weight, make sure you're staying active and not taking in too many calories. It helps to use an app like MyFitnessPal or write down the calories your eating so you have an idea of what your caloric intake is