"diet" wasn't my thing. this left me out of or seriously bored with many conversations.
i assumed it all had to do with some body image problem.
recently i watched a super good PBS video Eat, Fast and Live Longer with Michael Mosley (available it says until 9/7) http://video.pbs.org/video/2363162206/ and decided to try it. (except i don't really want to live with michael mosley)
now i get it! it's a way to organize your life. instead of wandering aimlessly about in life, you are on a mission, a project. you research, you devise menus, your brain has something to do when it needs distraction -- think up menus, plan new wardrobes, pat yourself on the back, plan how you'll get through a restaurant or party experience, all that kind of stuff.
Things People Organize Their Lives Around fascinates me since i quit my job. it's kind of a sub-category of my lifelong interest in What People Should Do With Their Time, other than, that is, criticize everyone else for how they're spending THEIR time.
anyway, this 5:2 diet is great, because you only do it 2 days out of 5, and on the days you are eating very little, you can just reassure your tummy that tomorrow you will FEAST!