LOL...I absolutely don't recommend pizza for weight loss. Which is unfortunate for me, since it's probably my single most favorite food. But, much to my dismay, I've found the two things that have the lowest "diet value" as foods (balancing nutritional content, ability to be "filling," and its caloric "expense") are breads and cheeses. In other words, 2/3 of your basic pizza.
The 3.4 pound loss this week seems to be part of a pattern I'm finding myself in - 2 or 3 weeks with a half-pound loss or less, followed by a bigger loss the next week. It's happened for about 2 months now. 3.4 pounds a week, consistently, would not be sustainable, at least for me. It's all I can to do average about 2.