Probably what has happened is that you are leptin resistant. Fat is what produces the leptin to tell your brain that it's got enough fat. Now that you've lost a lot of fat your brain isn't getting as much leptin as before. You still have a lot of fat sending the signals to your brain but you're leptin resistant so the reduced message from your reduced fat cells is like a signal to your brain that you're starving and have run out.
Originally Posted by bugleboy68
Female, 5'3", 48, Starting weight: 163lbs. Current weight: 135.
Starting squat: 45lbs. Current squat: 145 x 4.