Which of the following individuals is most likely to have the highest percent composition of fluid?

• A. A lean 25-year-old male.
• B. An overweight 25-year-old male.
• C. A lean 25-year-old female.
• D. An overweight 25-year-old female.

Answer: (A)

Verified step by step guidance

1. Understand that the percent composition of fluid in the body is influenced by factors such as age, sex, body composition (lean mass vs. fat mass), and overall health.
2. Recall that lean tissue (muscle) contains more water compared to fat tissue. Therefore, individuals with a higher proportion of lean mass will have a higher percent composition of fluid.
3. Recognize that males generally have a higher percentage of lean body mass compared to females, which means males typically have a higher fluid composition than females of the same age and body composition.
4. Compare the options: A lean individual will have a higher percentage of lean mass (and thus a higher fluid composition) compared to an overweight individual of the same sex and age.
5. Conclude that the lean 25-year-old male is most likely to have the highest percent composition of fluid, as he has both the advantages of being male (higher lean mass) and lean (lower fat mass).