Final answer:
Scientists developed mathematical formulas to define 'ideal' body weights in the USA, including the BMI as a standard for measuring obesity. Growth charts for children also provide standard weight-to-height ratios. The USA uses both the customary system and the metric system in weight measurement.
Step-by-step explanation:
In the USA, the measure of ideal weights was first developed to standardize the "ideal" body weight and relate it to health. Scholars and healthcare professionals have worked on creating mathematical formulas that consider weight and fat mass to diagnose obesity and assess chronic disease risk. The Body Mass Index (BMI), for instance, is a simple calculation using body weight in relation to height and has become an internationally recognized standard for identifying overweight and obesity issues.
Children's growth charts such as Figure A3 also illustrate the Length-Weight Relationship for American Boys and Girls up to 3 years, providing data on the typical growth patterns of American children. The United States traditionally uses the customary system of weight measurement, but the metric system is used as well in scientific research and international settings.
It's essential to note that the movement towards uniform measurements began about 200 years ago, following the French Revolution, with the spread of the metric system by scientists. In the United States, however, the adoption of the metric system was not realized despite efforts by Thomas Jefferson in 1799, and the customary system remains in use alongside the metric system.