Final answer:
The exact percentage of the population with a hyposthenic body habitus is not provided, but given that over 70% of U.S. adults are categorized as overweight or obese, those with a hyposthenic body type would fall within the remaining minority.
Step-by-step explanation:
The percentage of the population with a hyposthenic body habitus is not specifically mentioned in the provided materials. However, the prevalence of obesity can give us a clue about body habitus distributions. Obesity is characterized by having a body mass index (BMI) over 30 kg/m² and is associated with various health risks. The materials indicate that obesity and overweight affect over 70 percent of adults in the U.S., which implies that hyposthenic, or underweight, individuals make up a smaller percentage of the population. A hyposthenic body type, which is characterized by a thinner, more slender frame, would likely fall under the 'underweight' or possibly 'normal weight' category as per BMI calculations. Considering the provided data, a majority of the population have a BMI that categorizes them as overweight or obese, leaving only a minority with a hyposthenic build.