Bijou Phillips was recently quoted in the LA Times saying veganism made her sick and described coming off the vegan diet as "recover[ing] from a famine." She praised the Atkins diet as equally making her lose weight without the sickness. [[Article]]
And all I have to say to that is-- perhaps it's because you went from eating no calories to eating calories? I think people who go on a vegan diet to lose weight make the fatal mistake of only eating salads, etc. Whereas, eating meat, cheese, and low-carb vegetables will provide a much higher calorie diet.
Clearly, however, we should disregard her experiences as she seems to be a neurotic yo-yo smoker/dieter, with a very skewed vision of herself.