Question: What foods does a vegan refuse to eat?
About the article "Vegetable", section "Nutrition".

Candidate passages:
Vitamin B12 deficiency is potentially extremely serious, leading to megaloblastic anemia, nerve degeneration and irreversible neurological damage.
Evidence suggests that vegans who are not taking vitamin B12 supplements do not consume sufficient servings of B12 and often have abnormally low blood concentrations of vitamin B12.
This is because, unless fortified, plant foods do not contain reliable amounts of active vitamin B12.
The Vegan Society and Vegan Outreach recommend that vegans eat foods fortified with B12 or take a supplement. 
Raw vegans must ensure that their intake of vitamin B12 is adequate, since it does not occur reliably in plant foods.
Vitamin B12 deficiency can have serious consequences such as anemia and neurodegenerative disease.
The Vegan Society and Vegan Outreach, among others, recommend that vegans either consistently eat foods fortified with B or take a B supplement.
Tempeh, seaweed, spirulina, organic produce, soil, and intestinal bacteria have not been shown to be reliable sources of B for the dietary needs of vegans.
Vitamin D deficiency is possible due to the absence of dairy products but preventable with the usage of supplements and time spent outdoors. 
A Must-Have Guide for the Smart Vegan.
A vegan lifestyle is the newest hot health trend—thanks in no small part to the smart, fearless, and number one New York Times bestselling "Skinny Bitch" books.
But with so much conflicting information out there, it's not always easy to make the best choices.
Now "Skinny Bitch" coauthor Kim Barnouin is back with a book that makes making the right vegan choices easy.
In "Skinny Bitch Book of Vegan Swaps," Kim Barnouin takes the mystery out of following a plant-based diet.
It's a comprehensive, user-friendly guide that tells you what foods look healthy, but actually aren't, and explains how to avoid the stuff you don't want.
And because Kim knows that the concerns of today's savvy eaters run the gamut from calories to carbon footprints, she explains it all.
"Skinny Bitch Book of Vegan Swaps" offers exciting and tasty alternatives for vegans, whether you're just starting out or have been a vegan for years.
Barnouin's fun, no-nonsense voice sparkles on every page and in helpful features like:  The Best Places for Vegans to Grocery Shop  Delicious Swaps for Your Favorite Dairy Products  Top Ten Things to Eat While Stranded in an Airport  
Turtle Island Foods is the company which produces Tofurky, a popular vegetarian and vegan alternative to turkey, as well other meatless products.
All are vegan and approved by the UK Vegan Society, and most are kosher-certified by the Kosher Services of America. 
Vegucated is a 2011 American documentary film that explores the challenges of converting to a vegan diet.
It "follows three meat- and cheese-loving New Yorkers who agree to adopt a vegan diet for six weeks."
The director interviewed a number of people to participate in this documentary and chose Brian, who likes to eat meat and eat out; Ellen, a psychiatrist, part-time comedian and single mother; and Tesla, a college student who lives with her family.
In the film Dr. Joel Fuhrman and Professor T. Colin Campbell discuss the benefits of a plant-based diet consisting of whole foods.
The film also features Howard Lyman and Stephen R. Kaufman.
Kneel Cohn makes a cameo appearance.