I asked on the SP website what Dr. S considered to be "ideal body composition" in terms of body fat percentage, since she uses that vague statement so often. This was the reply:

"I found a chart that may help you at www.healthchecksystems.com/bodyfat.htm that classifies your % body fat (men and women) into categories. Assuming that you are an average
active female:
CLASSIFICATION WOMEN(% FAT)
Fitness 21-24%
Acceptable 25-31%
We consider ideal body composition to be near the fitness range."

Sure hope this doesn't mean that following the plan will make me fatter!

Jen