I don't think it was only the 1000 calories that makes the fat fast work, it's also the 90% calories from fat. And it's not a long term thing, only 3 - 5 days, so 3 - 5 days isn't going to be enough to depress your metabolism sharply (I hate the term starvation mode, I don't think it's accurate, I think what happens is our metabolism adjusts to the low calories because that all it thinks it's going to get).

I'd try upping the calories too. I recently read an article, sorry don't have the link, though I'll look for it, talking about how you have to eat at least as many calories as your basal metabolism is to avoid depressing your metabolism. I'd think that is much closer to 1600-2000 calories for you than 1200.

I'll see if I can find the link.

That said however, everyone is different, I've heard of people having great success on low-calorie Atkins too, keeping calories to 1000 or less. Not that it sounds like fun, yuck!

Valerie