Final answer:
Weight change and risk for malnutrition is best assessed by % body mass index (BMI), which is calculated using a person's weight and height. BMI categories help identify underweight, healthy weight, overweight, and obese individuals, but it is crucial to consider BMI's limitations, as it does not account for muscle mass, fat distribution, or bone density.
Step-by-step explanation:
Weight change and risk for malnutrition is best assessed by % body mass index (BMI). BMI is calculated by dividing a person's weight in kilograms by the square of their height in meters. It is a widely used measure that provides an estimate of body fatness and relates this to the risk of chronic diseases such as cardiovascular disease and Type 2 diabetes. A BMI below 18.5 is typically considered underweight, a BMI of 18.5-24.9 is normal weight, a BMI of 25-29.9 is overweight, and a BMI of over 30 is considered obese. However, it's important to note its limitations: BMI does not take into account muscle mass, fat distribution, or bone density, all of which can influence the BMI result. For a comprehensive assessment, additional measurements may be required to account for these factors.