Damaged metabolism !

So I previously asked the 1200 calorie question and found out that eating below 1200 calories may permanently damage your metabolism and I am a little worried as my calories are something like this : i eat 1000 calories 4 days a week and then eat whatever I feel like for 3 days a week ( pizza , pancakes etc) which amounts to about 1500-2500 calories daily for those 3 days
Is this bad ? Will it permanently mess up my metabolism?
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