What's the skinny?

This has been bothering me for the last week. I bought Self magazine during my 3 hr layover in DFW, and decided to try the one month body makeover. I made it through the first week, we'll see what happens with the next 3. Anywhoodle, Workout #1 (lose 8 lbs) is accompanied by these pics:

It's definitely the same model - you can see that the hair is exactly the same and, more importantly, so is the background (there's no way they set up another shoot 4 weeks later). So my question is did they airbrush her thin or chubby? I mean, god forbid they use 2 models, or have someone actually do the workouts (although I wouldn't want a "plus sized" model - who are 10's or 12's btw - to have to lose weight, but this just feels wrong. It's like used false lashes in mascara advertisements.)