What technique uses X-rays at two different energies to estimate body composition?

The technique that employs X-rays at two different energy levels to assess body composition is known as Dual X-ray Absorptiometry (DXA). This advanced imaging method differentiates between various types of body tissue, such as fat mass, lean mass, and bone mineral content, by measuring the absorption of X-ray beams that pass through the body. The two energy levels enable DXA to effectively estimate body composition with high accuracy, as different tissues absorb the X-rays differently based on their density and chemical composition.

DXA is considered a gold standard for body composition assessment because it provides precise measurements that can be crucial for medical and health-related evaluations. It offers detailed insights into a person's health status and can help in making informed decisions about dietary and fitness interventions. Other methods listed, such as hydrostatic weighing, bioelectrical impedance, and skinfold assessment, do not utilize X-ray technology and have varying degrees of accuracy and application, but they do not provide the same comprehensive data as DXA does.