She mentions changes to her subjects musculature on restricted calorie/high cardio diets as an impediment to future weight loss. So why not do what's practically canon among modern athletes and bodybuilders - make healthy muscle development (or at least preservation) a primary goal of the diet/exercise regime. In other words, do the opposite of what all these beleaguered people are doing?
Bodybuilders disdain cardio because it results in hormone changes that actively inhibit muscle development. Conversely, weight lifting boosts testosterone and lean body mass.
The whole outlook here is so out of keeping with the wisdom of the highly fit people I know (and my own experience shedding and keeping off 50 pounds of excess weight for five years without the grueling effort she describes) makes me question her conclusions.