Originally Posted by PinkFlower
Thanks for your help tjlhb. I wasn't smart enough to take my BMI when I lost all that weight but I defiantly feel a lot flabbier than I did before. If it matters I am a 25 year old female.
BMI is just a calculation based on height and weight (BMI = (mass in kilograms) / (height in meters)^2 ). As such, it has the same limitations that weight alone has in assessing whether you are fat. Although if your BMI is 19 or less, you could be underweight, in which case gaining weight is generally suggested (but unless you have a body fat percentage that is very low, it is best to try to make much of the gains to be muscle).
What you may want to consider is tracking your body fat percentage, or some proxy like waist size. Waist size, measured at navel level, should generally be no more than half your height, and, for non-pregnant women, less than 0.8 times your hip size, measured at the largest part.
There are many ways to measure body fat percentage. The more convenient and less expensive ways are not that accurate in an absolute sense, but may be useful in giving trends over time.