I've been drawn to it for a while, and have just begun to try it. With alternate day feasting, I eat whatever I want (my norm anyway - anything vegan without sugar) on Day 1, then I just drink water and don't eat any carbs (or much at all) on Day 2. The goal is to move my body into processing ketones, but allowing me to keep a mostly normal lifestyle every other day. Sort of. People tout longevity, better immune function, and a host of other pluses as positive benefits to alternate day fasting.

Usually I have something pushing me to do things like this. At the core, I don't have a burning reason for this one - just a tug at my mind that's been there for a while. And I got a bunch of chia seeds on sale. Chia seeds don't have any carbs, are great to eat alone, and are awesome to eat on my almost-fasting day. I don't want to follow an optimally-balanced-weigh-out-all-your-food-and-only-eat-exactly-what-you-need diet, but I'd definitely like to continue to improve my health. I still have major issues that maybe diet could influence. 

I'll see how it turns out, how I feel, and how the social consequences run. I read somewhere that I should feel hungry for the first 4-5 fasting days, or until my body has gotten used to the longer cycle and doesn't need quick carbs to function. I'm sure hungry right now. But I can eat tomorrow... and I got extra scripture study in today.