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The requirements for a healthy diet can be met from a variety of plant-based and animal-based foods , although a non-animal source of vitamin B12 is needed for those following a vegan diet .
 vitamin B12
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 vitamin B12