Those charts are bullshit. Some people (high bone mass, serious weight trainers) have to look damn near anorexic to meet them.
I did BMI checks on a bunch of family members at Christmas to get our New Year's resolutions going. My grandmother is a size 0, weighs 120 at 5'3". She is considered a "healthy" weight for her height and looks borderline anorexic. She has been ill and has trouble keeping her weight up.
I ended up with a higher BMI than my mom, but I'm three inches taller and I wear smaller clothes. I'm much more muscular than she is, but based on the weight charts I'm more unhealthy than she is. I don't deny that I need to lose weight, but I strongly dislike BMI charts.
Don't get me started on the pediatric weight charts. I still remember being 16 and a doctor very bluntly telling me how much I had to lose, and telling me that I should be working out every day ( I was doing kick boxing 4 days a week at that point, but she didn't think that was good enough). Looking back, I was maybe 10-15 pounds overweight based on an adult chart, but I was above the 99th percentile on the pediatric chart, so I was obese according to the doctor.