I agree with Nat. Technically the fat fast is 90% (even though Atkins says in his book 75-90).

I keep doing the same thing. I don't keep my fat intake up, I don't lose weight. I increase it (and my calories), I lose 1 pound the next day.

Yesterday, I experimented, eating 1550 calories (77% fat). I've always understood those calories should be consumed for a man to lose weight, not a woman. I didn't exercise so I was sure that I would gain or stay the same. Nope, I lost 1 pound.

It's hard to get past all our preconceived notions about weight loss that are usually incorrect. Fitday helps to play with numbers and find what works best.