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Some pet owners and veterinary organizations have advised that , as a legume rather than a grass hay , alfalfa consumed in large amounts may lead to obesity , as well as bladder stones from the excess calcium in all animals except for pregnant and very young guinea pigs .
 legume, obesity
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:
 legume, obesity