Does a cheat meal once a week hinder weightloss?

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I know that to lose weight you need to be in a calorie deficit, basically -3500 cals a week for a lb. I usually have a cheat meal once a week, but I feel like all my progress from the week goes down the drain since I'm ingesting so many additional calories. Granted, I have lost a lot of weight, but very slowly. So I'm wondering if a cheat meal is the reason why. What are you opinions?

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