I started at 2000 cals and couldn't believe i lost weight eating that high LOL but then again i was 323 pounds! By the time I was 250ish, I think I dropped to 1800, then down to about 1600 was the lowest i ever got. I knew I couldn't sustain 1500 cals without being miserable so I was happy enough with the 4 or 5 lbs. lost a MONTH -- super slow, but it stayed off that's all I care about! i wasn't in any mad rush, but i know the urge to shed quickly is important to some. My only advice is don't eat so low that you can't "LIVE" like that for more than a few weeks, it'll just backfire