Kutekitty is right. Its not unusual or unhealthy for the first few weeks of a diet to cause BIG weight loss. Your body can hold an amazing amount of water and this initial weight loss is almost always water weight.
After your body has adjusted to the new diet and the water weight is gone, you should see a significant slow down in the rate of loss. Your body can only metabolize about 2lbs. of fat a week. So, if you're losing faster than that, you've started to use your muscle mass for fuel. And while this might make the scale show a smaller number, its counter-productive to the goal of permanent weight loss because it will signficantly slow your metabolism down. A single pound of muscle burns something like 60 calories per day. A pound of fat only burns 2 calories each day. So, to protect itself from starvation your body will use up muscle mass.
To avoid this, make sure you're eating ENOUGH food and exercise. A 20-30 minute full body weight lifting routine 2-3 days a week would probably be sufficient for maintaining muscle mass.
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Progress, not perfection
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