I absolutely think this is a low-calorie diet - at least for me. I think a calorie is a calorie is a calorie, and am only able to lose weight by taking in under 1500 calories. (Even with regular exercise) The key is, I CAN eat 1500 or so calories and not grip my head all day, thinking about food.

I did Zone years ago, and lost 35lbs forever. At that higher weight, I was able to lose it all by eating about 1800 low-carb calories a day. If only 1800 was still my weight loss number! But once I hit my goal weight - which will no doubt take a few more months (I lose fat at snail speed) - I will probably stick around the 1800 mark as my maintenance area. (Unless of course, I start running ten marathons a year! Not!)