Paleo is different things to different people. There are a lot of people here at 3FC that know more about it than I do.
As I understand it, fruits and vegetables that are organic, grass-fed/pastured meat/poultry and wild-caught seafood, nuts and seeds, plus fats sourced from all those sources. Some say no dairy, some say no legumes or grains. And definitely the least processed foods. Basically anything that can be hunted and foraged for.
I think it's important to understand that any program that reduces calories will help you lose weight. For me, eating Paleo supports my health objectives. I have cleaned up my diet a lot and gotten away from eating processed foods, junk and fast-food, and foods that don't help me stay healthy. I eat a lot more non-starchy vegetables, higher quality proteins and healthy fats.
Paleo can be about more than just diet. If you haven't already found it, I suggest you read the works of Mark Sisson