I have a problem that after I eat I will try to puke! what can I do?

I love to eat but I don’t want to get fat , I decided to eat a lot of food for one mean and puke right after. I think I need to fix it but I can’t and I been like this for 2-3 year , can you help me figure way out to fix it , I wnat to stop doing it cuz it’s bad for my health
I have a problem that after I eat I will try to puke! what can I do?
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