Total calories needed is also going to depend on your age and your activity level.
The formula in the book will, as Lou says, return numbers that look scary if you compare them to typical "dieting" recommendations. But the primary goal of those calories is to get you through Alwyn's workouts, which then provide the muscle that burns more calories.
I'm 5'2", but around 130. NROLFW has me at 1900 cals, non-workout, and 2200 cals, workout, for maintenance. And so far, I've been mostly maintaining (possibly losing a little fat and gaining a little muscle, but I'm not sure I entirely trust my scale :P). I'm going to continue at the maintenance level for another week, and then either add a HIIT session or cut 100 cals from each.
Try the recommendations in the book for a few weeks and see how it goes.
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