Maintenance help

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I was wondering if anybody was to maintenance yet. This is hard for me because I only know how to gain and lose. I read that gastric bypass patients have to eat less than 1000 calories to maintain. Has anybody found that to be true? I've been on maintenance for about a week and my weight fluctuates up and down a couple pounds and I'm eating about 850 calories a day. That is such low calories and some days I find that I don't feel well. Like low blood sugar or something. If anybody has some maintenance advice for gastric bypass I would really appreciate it. Thank you. Jacki.