Hi,   If you are female:   A body fat percent of 21.7 is healthy.  You need a minimum body fat percent of 17% to start menstruating.  Throughout puberty body fat gradually increases to an average of 23% for females.  A normal male body fat is 12%, so much lower than females due to greater muscle mass.   The following is a guide for an adult female.  You can use it as a reference for comparison.   Body fat between 14-20% is considered athletic. Body fat 21-24% considered a fitness level. Body fat 25-31% is acceptable. Body fat percentages greater than 32% are defined as obese.     By being physically active and selecting healthy foods you should be able to maintain a body fat percent in the healthy range.  Calculating your BMI is another method you can use.   Lisa Nelson, RD, LN Lower Cholesterol, Control Blood Pressure, Lose Weight