Does extreme calorie restriction (under 1000 a day) cause rapid weight loss or does it slow the metabolism?

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Question by brazen: Does extreme calorie restriction (under 1000 a day) cause rapid weight loss or does it slow the metabolism?
I've seen two conflicting stories about extreme calorie restriction. One says that it causes rapid weight loss, the other that it slows the metabolism and causes an inability or decrease in speed of losing weight. Which is true? Any personal experiences?


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