She definitely did not go ht. That pg was a total surprise as she was in contract to be the spokesmodel for weight watchers.

Let's face it, its a 50/50 everytime no matter what you do. If something is swayed, its not like it would be 80/20 or something -- maybe only 60/40 at best, and I mean best. Any study that shows correlation between diet and gender shows about a 5-8% sway in one direction or the other.
Much of what we get is pure luck, (not that Jessica was the one who needs luck) but its a flip of a coin every time and she just got lucky.

I do agree that her diet was absolutely low calorie (hence losing like 40lbs in the 5 months prior to conceiving) but she was also probably eating extremely healthy which is not her norm. Jessica is known to eat -- well, crap and carb's. Her trainer probably put her on a diet of 1200-1400 calories a day consisting of veggies, lean protein like salmon, and chicken, some fruits and little whole grain carb's.
Even though its low calorie is probably a lot healthier than she has been eating.