17.7% is quite low for women- I mean, that's in the "athletic" range. It could be that she's like me and almost all of that fat goes straight to the lower abdominal region, making the fat feel more prominent and "bad" but you are right- Alli should NOT have been given to her if she is 17.7% body fat. Honestly losing any fat might not be advisable- what I mean is that she doesn't need to! She would benefit a lot more from strength training and basic levels of aerobic activity. How much does she weight? Does she want to keep muscle? Let her know that losing weight is NOT the way you get the "flat tummy" look. You only get that through good muscles- the exception, of course, and I wouldn't bring this up to her, is with EDs. Anorexics, in extreme cases, can be very low body fat% and weight enough that they have flat stomachs but they do not look like the healthy, trim flat bellies.
How did you analyze that, by the way? The only truly accurate way is by hydrostatic/underwater weighing. Those can be much more expensive, but other ones can be off by quite a few %, especially for "skinny fat" people or for "large and muscular" people. If you use BIA, drinking water directly before or entering in false stats can drastically change the number (I once said I was 1" taller to see what would happen, and my body fat% dropped a couple %).
I don't mean to alarm you, but keep a careful eye on her. EDs develop sometimes from what seems like healthful behavior, so be careful and pay close attention. Give her support. Sometimes that means being harsher on her. The Alli might be just the conduit for bulimia- in which case, get her to a professional.
"One step in the right direction won't change the world, but it's a start. Someone's got to see the good in everything." -- Said the Whale, Banks of the English Bay
"Everything that you believe is everything you need right now." -- David Lanz, Whispered in Signs
| Body Fat %: 21.0