Do you think that it's important to get into character if the character has a special diet? For example the say that character is on a paleo diet (high protein, no grain diet). Do you go on the same diet?
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Brian, when I wrote my Master's thesis - - - on Blanche Duchess of Lancaster (the subject of Chaucer's tribute poem "The Boke of the Duchesse") - - I used candles in the evening and ate a medieval diet. Yes, it made a difference.
As Laurence Olivier was rumored to have said, "Why don't you try acting?"
I hope you never get cast as a Zombie.
Leo - - - amen!
Though a vampire and his his high garlic diet wouldn't be so bad. lol
Why? Is it a major character? Is the diet going to affect the way this character acts and talks with regard to the outcome of your story? Why don't you simply start with some basic research to see how that diet affects people?
More important than the diet itself is why the person is on the diet and her view of others who are not. Are your relationships with others affected by your choice of being on this diet? This is what's important not the food.