Are you sure your range is 50 lbs? According to this chart it seems like the range for most heights is less than 40 lbs, even if you're super tall. Either way it never actually occurred to me to think of my healthy weight as a range instead of a number. I could weigh up to 158 and still be in the healthy range. But perish the thought. I weighed 155 for a few years after having our third kid and I just felt so chubby.