I used to love to watch her show on BBC America television. It always inspired me to eat better. But to be honest, she has a very radical approach to food and eating.
First, she eats strictly for health. She ignores the tastebuds and anything that food represents (tradition, culture, celebration, bonding, pleasure) except for sustenance. That makes her method unrealistic for most of us.
Even though some of her clients made major improvements, I wonder if there was any backsliding later on. It is an effective program, to be sure, but one that is exceedingly difficult to maintain for life.