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After 22 weeks , half of the animals on the HFD were changed to the LFD , whereas the other half continued on the HFD for an additional 8 weeks , such that there were 3 groups : 1 ) a LFD control group ( Con ; n = 18 ) , 2 ) a HFD - fed , DIO group ( n = 17 ) , and 3 ) a HFD to LFD , DIO - reversal group ( DIO - rev ; n = 18 ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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