Also, consider whether your range is appropriate.
If you aren't very big now, with little weight to lose, you may have set an aggressive weight loss goal that isn't very realistic, and keeps you on a much-reduced range in order to attempt to achieve what you've asked.
If your amount to lose per week is more than about 3% of your excess weight to lose in total, it's probably too fast.
Eg if you have 20lbs to go, that should have a goal rate of no faster than 0.6lbs per week, or in other words a goal date of no closer than 6-8 months away.
Deb, in New Zealand