Waist circumference is a measurement taken around the narrowest part of the waist, typically just above the belly button. It is an important indicator of body fat distribution and can help assess the risk of health issues related to obesity, such as heart disease and diabetes. To measure waist circumference, use a flexible measuring tape and ensure it is snug but not compressing the skin. The measurement is usually taken in inches or centimeters. Health professionals often use waist circumference alongside other metrics, like body mass index (BMI), to evaluate an individual's overall health.