Wasn't there a "diet" that recommended eating as much lean meat as you wanted and cutting out carbs like bread and potatoes to lose weight quickly?

The Mormon Emergency Preparedness Manual recommends storing 20 lbs. of cooking oil or other "fat" sources per average adult per year. Using that recommendation as a guide, a small bottle of cooking oil, clarified butter or even peanut butter squeeze tubes in the BOB or pack should stave off the effects of "rabbit starvation" for quite a while.