William James Moriarty has a fixation on control. It's his job to be in control, considering he's the Lord of crime. Unfortunately, once one has a taste of control, they'll always seek more. For William, this was food. The calorie counting was easy. He's a math professor, after all. The same can be said for calculating his BMI, body fat percentage, and TDEE. After a few months or so, he's worked down to 52 kgs, or 108 lbs. This put him at a nice BMI of 15.2. It's not low enough, though. Now he finds himself sitting at his desk, grading his student's papers during what should be his lunch period. Not like he'd waste time on food anyways.