Waist Circumference measures abdominal fat (belly fat).
Excessive abdominal fat is seen in apple shaped body types in men, and can also be seen in post-menopausal women. Major health risks are associated with carrying extra fat around the abdomen.
Regardless of height or build, a waist measurement greater than 94cm for men and 80cm for women is an indicator of internal fat deposits surrounding the organs.
Combining the Waist Circumference with the BMI predicts health risks better than the BMI alone.