101816
Like many types of yogurt , strained yogurt is often made from milk that has been enriched by boiling off some of its water content , or by adding extra butterfat and powdered milk .
 butterfat
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:
 butterfat