I eat a well balanced diet and I exercise a few times a week - why am I still obese?

What do you think about this? This is my situation and some of my friends are in the same boat. What else do you think could be done to lose weight? My parents want me to take weight loss medication but I really don't want to go down that road :(
I eat a well balanced diet and I exercise a few times a week - why am I still obese?
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