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She added: "I always bring everything back to diet. When I don't eat well, I don't feel well, and then my moods go all over the place."
Silverstone says she turns to fresh herbs, greens, miso soup and ginger tea to keep her body healthy, and for her mental and physical health she takes daily long walks, practices yoga and meditation, and keeps a journal.
The Lodge actress also spoke about the bullying she has received because of her decision to have her son follow the same plant-based diet as her, as she said people have referred to her as "the freak".
Speaking to the New York Times newspaper, she said: "People said lots of different things, and I was sort of 'the freak', and I guess I'll take pride in that because it is hard to be the person that's speaking out, and it is hard to be the person that is saying the thing that isn't what everybody else wants to hear."