It assumes (quite wrongly), that everyone Blood Balance Formula on Earth has the same body composition. But if walking around teaches you anything, it should be that people come in all different shapes and sizes. And your health is far more dependent on how much (or preferably little) fat you're carrying, than it is on what some number on a table says. More lean mass is better lean mass.
As a general rule, the BMI is a general measure, as it is a simple reference point that you can use as a personal benchmark. The point is that if you have a high BMI, it is likely that you have a seriously increased risk for heart disease, high blood pressure, and Type 2 diabetes.
But no matter how fat is measured: in the form of BMI, body composition or even by measuring your waist, being overweight and carrying fat around your abdominal area aggravates insulin resistance. Insulin resistance is when the normal level of insulin produced by your pancreas does not allow sugar to enter your cells normally. Then your pancreas produces more insulin; when your cells still do not respond, sugar (too much) builds up in your blood, hence high blood sugar levels.
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