22 Weeks and a major revelation

My birthday, December 9th, is the second Thursday of December.  Exactly 22 weeks from today.  50 pounds divided by 22 weeks comes out barely more than 2 1/4 pounds a week.  Totally doable.  Especially in the light of this little nugget of information.  Remember my diatribe against pizza yesterday?  Well, two pizzas plus breadsticks ("Cinna Stix®" actually) work out to a whopping 5,760 calories!  Even spread out over 3-4 meals in a weekend, that's between 840 and 1,320 EXTRA calories per meal.  Meaning if I eat 3-4 nice, filling, healthy meals instead of pizza, I'm saving between 3,360 and 3,960 calories a week!  Here's the kicker: There are 3,500 calories in one pound of fat.  Conventional wisdom says that in order to lose (or gain) a pound of fat, you must either subtract (or add) 3,500 calories from your diet.  Ignoring all of the physiological factors that play into weight loss...ignoring exercise...ignoring the healthier diet choices I'm making in the rest of my life...from a purely "calories in" perspective, this one change will amount to a pound a week--possibly more.