Recently the Mayo Clinic published some new findings regarding healthy lifestyles that claim that less than 3% of US adults maintain healthy lifestyle characteristics that are closely linked to risks for various chronic diseases. One of the factors they used to define a healthy lifestyle was a healthy body fat percentage.
However, the study also had a very significant secondary finding regarding body fat percentage: that a healthy body fat percentage alone increases "good cholesterol" and reduces total overall cholesterol, even if a person has unhealthy lifestyle factors including poor diet, smoking, and a sedentary lifestyle.
Why is this important? Because most studies that link being overweight to health problems, such as cardiovascular disease, have used BMI as a marker. This is one of the first to show an association between BF% and specific factors that contribute to cardiovascular disease, such as high cholesterol.