Trying to lose weight by changing eating habits WITHOUT going to the gym?

Anonymous
basically I need to lose 20 pounds I go to the gym as often as I can but despite that fact, I overeat a lot and so what I am going to make it harder for myself is stop going to the gym completely, and just focus on my eating.

how will this impact my health? will this slow down my metabolism because I will essentially lose muscle?

answer the question alone please without giving me advice that I already know. Thanks everyone!
Trying to lose weight by changing eating habits WITHOUT going to the gym?
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