Do you have to increase your BMR to lose weight?

No, you have to reduce your caloric intake on a daily basis to a number appx. 200 calories below your BMR. Your "BMR" is a caloric measurement that determines how many calories you need in a given day to "maintain" your current weight. You can increase calories to gain weight or reduce calories to lose. Here's an article that explains it in a little more detail and teaches you how to calculate it:

http://www.ehow.com/how_5401507_lose-off-using-simple-math.html