Body water content in percentage of body weight is lowest in –
**Core Concept**
Body water content varies among individuals and populations, influenced by factors such as age, sex, and body composition. The percentage of body water is an essential parameter in clinical assessment, particularly in patients with suspected dehydration or fluid overload.
**Why the Correct Answer is Right**
The percentage of body water is highest in infants and decreases as age advances. In adults, the average body water content is approximately 60% of body weight, with a range of 55% to 65%. However, this value can vary significantly depending on the individual's body composition, with athletes and individuals with a high muscle mass having a higher body water percentage. The correct answer is likely to be a population with a lower body water percentage due to their age-related changes in body composition.
**Why Each Wrong Option is Incorrect**
**Option A:** Infants have the highest body water percentage, typically ranging from 70% to 80% of body weight, making this option incorrect.
**Option B:** Elderly individuals also have a high body water percentage, although it may be slightly lower than that of infants and young children.
**Option C:** The correct answer is likely not to be an option with a high body water percentage, such as infants or young children.
**Clinical Pearl / High-Yield Fact**
In clinical practice, it's essential to consider the patient's age and body composition when assessing their fluid status. For example, a patient with a high body water percentage may be at risk of hyponatremia if they develop edema.
**Correct Answer:** B. Elderly individuals.