Final answer:
The only authorized method of estimating body fat is Dual-energy X-ray absorptiometry (DEXA), which uses two low-dose X-ray beams to measure energy absorption variations and provides an accurate estimation of fat content.
Step-by-step explanation:
The only authorized method of estimating body fat mentioned is Dual-energy X-ray absorptiometry (DEXA). This technique uses two low-dose X-ray beams that are directed through the body, measuring the amount of energy absorbed by the tissue. The absorption rates vary depending on the body's content of bone, lean tissue mass, and fat mass. Using this data, along with standard mathematical formulas, health professionals can accurately estimate the body's fat content.
Other common methods for estimating body fat include Bioelectrical Impedance Analysis (BIA), Body Mass Index (BMI), and skinfold thickness measurement using calipers, but if the question implies that there's only one 'authorized' or possibly 'most accurate' method, DEXA is the method of choice due to its high level of accuracy in determining fat distribution and concentration in the body.