I was attracted to fasting because I had gained some weight due to a lifestyle change where I became more sedentary. My blood pressure also raised. Due to not wanting to go on medications, I researched extensively the options and fasting came up. I initially started out with juice fasts, worked up to 30 days and lost 32 pounds and my BP was normal within 7 days.
I had amazingly high energy and great sleep, yet from the experience the most lasting effects were spiritual/emotional.
So yes, in my case several years ago, the weight loss pulled me in but the other effects have kept me committed.