Go to the Activity tab, and on the right, under the What Did You Do Today line, you will see "Customize Metabolism". Click on that and it gives you the option to select Mifflin.
"If you drop an egg, you don't say, 'Oh, shoot' and drop the other 11, do you?"
-Source unknown, but obviously brilliant
Reached goal 4/16/2010...but kind of afraid to look these days