For me, lunch was usually some low quality food grabbed in a hurry, and so it was the easiest meal to cut out. But the main reason to cut lunch was that I always got sleepy mid afternoon, and falling asleep in meetings isn't really acceptable. Not having lunch makes my afternoons much more effective, which is great as I'm not really a morning person.

Theravada monks also follow this approach, but not for weight-loss reasons, obviously