Kfisherx posted this in another thread and I just read it yesterday. Have a look:
Bodybuilding.com - David Greenwalt - Living With Obesity At 700 Calories Per Day!
I'm not 50, I'm 24. But I've been trying to lose weight most of my life, off and on, blah blah blah. I've lost weight at 1800 calories, I've screeched to a halt at 1400 calories and I've gained just LOOKING at food. This week I'm eating 2500 calories, and it's brilliant.
Trust the program. Metabolism chases intake.
You WILL gain weight at first. Your body is adjusting. And then you'll lose fat while eating more and nourishing your body with additional vitamins and nutrients. Oh, um, and you'll be happier. Eating 2500 calories, my energy is through the roof, I'm chipper (wow! this is a big accomplishment for me =o), and I'm not craving sweets or junk at all.
Start slow. You'll get there.