4. BMI is Inaccurate, at Times.
While the BMI is a fast, inexpensive, and easy way to see if you need to lose weight, it only looks at your body mass compared to your body frame. So if you work out a lot and have substantial muscle mass then you may actually be obese. This is where BMI is not accurate and it tends to affect many guys who frequent the gym. Also, the BMI does not tell you if you carry your mass around your abdomen, arms, legs, or anywhere, which is not specific. Obesity can be overestimated due to the BMI calculation, but you should have an idea if you are obese and your BMI is above 30.