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Molecular biologist Marion Nestle argues that " knowledge of the relative proportions of animal and plant foods in the diets of early humans is circumstantial , incomplete , and debatable and that there are insufficient data to identify the composition of a genetically determined optimal diet .
 Marion Nestle
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:
 Marion Nestle