My BMI is 19.8 , But I am on a very low carb diet for the last 3-4 months and the HBA1c has come down from 7.1 to 6.1 so far. I want to bring the BMI under 19, I had diabetes for over 35 years, hope this will help. Dr Jason Fung (youtube) says even the skinny people may have fat in the liver...