On an episode of either Secret Eaters or Supersize vs. Superskinny, a femayo blamed meing fat on a low metabolism.  When they actually measured her BMR, it was 2,000 calories/day (obviously she wasn't yet at deathfat status).  In other words, you can imagine how fat the sister who lost six pounds on 2050 calories is--given that, as QuatroQuatro pointed out, she's probably vastly underestimating calorie counts.  "Olive oil is good for you," etc.