Health reasons, digestive issues, and an interest in long term health as well. The health benefits seem huge.
But also I was drawn to it because I have understood for years that humans have genetic primal programming that remains mostly unchanged (from studying psych and other general thought inquiries).
It seems to me that there are aspects to a paleo lifestyle, that are more than about the things we eat - though thats far more important than people realise. (And not just physical activity either).
The way we group, interact, the way our brains respond to light, to human touch, the way we remember things - its all geared to a way of life we no longer keep.
Whether its barefoot shoes, trying to cultivate a closer community or "tribe", or using softer lighting in the evening, the whole line of thought that is:
"is this the way we are meant to be, by our natures, by our history, by our genes?"
is a potent way to re-intergrate human needs back into a modern time that has forgotten its needs, deitary or otherwise.
Applying this line of thought to my food, is new for me. Paleo though, has long stuck a chord. And i have long thought about the other aspects, and it has reminded me that there are great benefits to re-evaluating modern behaviours, and asking that question, and trying to live more naturally in a modern age.