The program is too short to go into everything, and it is a pretty complex topic. There is a lot of really interesting research being done into dietary composition, and the role of sugars/fats at the moment.
The Eat Less, Move More brigade are oversimplifying too I think - my partner is eating around 1400kcal/day and goes to various classes/training sessions 5 days a week, plus running and is stalled with the weight loss. I eat a "traditional" healthy diet and do a pretty active outdoors job and am also stalled.
So we are willing to try something else - not as extreme as this - but probably a slightly higher fat/lower carb centered on low GI stuff, and see how we go!