I meant to post this ages ago, I pinched it from the forums at MyFitnessPal. It's a guideline for weight loss goals if you want to make sure you are losing fat and not muscle:
The less you have to lose the smaller your deficit should be, this means slower weight loss. Here is a guide when setting weekly weight loss goals that are appropriate for you:
If you have 75+ lbs to lose 2 lbs/week is ideal,
If you have 40-75 lbs to lose 1.5 lbs/week is ideal,
If you have 25-40 lbs to lose 1 lbs/week is ideal,
If you have 15 -25 lbs to lose 0.5 to 1.0 lbs/week is ideal, and
If you have less than 15 lbs to lose 0.5 lbs/week is ideal.