1,500 has always been my magic number -- whether at 16 or 54 (my last and lasting weight loss attempt). At 16 I lost 2.5 pounds a week on that regimen, at 54 about 1.25 pounds a week, which was still a decent pace. I've occasionally tried eating less than 1,500, but I get grumpy and lethargic and it's just not worth it. At 58 I maintain on 2,000 cals per day with formal exercise 4 times a week.
F.
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