The most important factor in determining whether a person is fat or lean is the person's:

Question

Quizplus · Accepted Answer

Body composition, specifically the ratio of fat mass to lean mass, is a more accurate indicator of whether a person is fat or lean than just their weight or body mass index. Someone may have a high weight or BMI but actually have a high amount of muscle mass, making them leaner than someone with a lower weight or BMI but a higher percentage of body fat. Gender can also play a role in body composition, but it is not the most important factor in determining whether someone is fat or lean.

The Most Important Factor in Determining Whether a Person Is