So a guy "fed the drug to mice for seven days" and discovered "white fat cells ... were being converted ... at a higher rate than usual." I give this study a z

So a guy "fed the drug to mice for seven days" and discovered "white fat cells ... were being converted ... at a higher rate than usual." I give this study a zero for effort. Would it have killed them to study this for longer? Where's my control group that is heavier at the end of the study?