The BMI is a bunch of health-Nazi B.S. I am 50 years old and have been 6' 2" and 175 lbs for the past 30 years. That gives me a BMI of 22.5. But that stupid BMI doesn't know that about 2 inches have migrated from my chest to my waist over that period of time!
So, I guess that you are suffering from furniture disease. Your chester has fallen into your drawers.!!!!!!