I am 5ft. 5in. and have a BMI of 23.3. I have tiny (but strong) bones. I am recovering from a disability that has caused a loss of muscle mass, though I have been building them up for the past two months, now, at the gym and with other forms of exercise. Are my tiny bones a factor? Meaning can I actually be overweight? Perhaps calculating BMI is more reliable using the under water method. Thinking about it, it makes more sense to me.