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How did I gain 4 kg in less than a week while in a caloric deficit?!!

I have been on a keto diet since mid February and at the beginning of june I had successfully lost 18 kg. I was getting really tired of keto so I had a cheat day, where I was still in a calorie deficit but ate carbs. Now about 4 days later I have gained 4 kg. It was 3 kg yesterday but apparently I gained another kg over the course of the day, eating only about 1500 cal while my measured rmr is 2350 cal!!!
How is that even possible?! I was losing about one kg a week before my cheat day and now I am gaining doing the exact same thing!!
I wanna believe it is water weight but how will I ever lose so much water weight and get back to where I was?!
I still have another 50 kg to lose so this setback is quite devastating to me...😭

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