917
Newborn female Wistar rats were fed a lithium - containing diet ( 50 mmol / kg ) for 8 weeks and then randomized to normal diet , HP diet ( 40 vs . 19 % ) , NX or HP + NX for another 8 weeks .
 lithium
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 lithium