It depends on your height and other factors so ask your doctor at your back-to-school physical.
It depends on factors such as, do you intend to include exercise and what type of dietary changes do you intend to make. A 12-year-old should lose weight under medical supervision. This is the age where bone density and other physical developments are taking place, and a poor diet or minimal intake of nutrients could cause long lasting effects that will carry through to adulthood.
In addition, counting carbohydrates, rather than severely restricting calories, will avoid slowing down your metabolism and, by that, achieve healthy lasting weight loss.
For in-depth information about the best diet and lifestyle to reduce or prevent obesity in children or teenagers, see the page link, further down this page, listed under Related Questions.
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