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", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Highest squat: 167.5 x 2. Current Deadlift: 190 x 3