What is Liz's body composition rating based on her estimated body fat of 18 percent?

A body composition rating based on body fat percentage provides insights into a person's overall health and fitness level. The context of the question revolves around Liz's estimated body fat of 18 percent. In general, for adult females, a body fat percentage below 25 percent is typically considered to be within a healthy range, often categorized as "normal."

With Liz's body fat percentage at 18, she falls comfortably into this category, indicating that she maintains a healthy level of body fat which is consistent with a normal body composition. This level is often associated with lower risks for health problems commonly linked to higher body fat percentages, such as obesity-related conditions.

The other classifications like "obese," "marginal," and "underweight" do not apply in this case, as they represent body fat percentages that are above the healthy range, borderline, or significantly below the recommended levels for healthy body composition. Thus, categorizing Liz as having a normal body composition reflects her health status accurately based on the given body fat percentage.