Can someone explain to me why you should up your calories as

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I have nine pounds to go. If I change my goal to loose only half a pound a week instead of two...will I loose slower or will I actually loose faster because of upped calories? Why would i want to loose slower - because it will ease me into maintenance calories? any other reason? Just looking for some clarification on this. I've been working out more lately and I eat back most of my cals but my weight loss has stalled. I eat 1200-1400 a day. Thanks!