 Now, that paleo diet, also known as the caveman diet, is based on the idea that humans should eat the same foods that their hunter-gatherer ancestors ate, such as fruits, vegetables, lean meats, fish, eggs, nuts, and seeds, and healthy oils. So they didn't hunt or gather Cheez-Its? That's no bag of chips. Not encouraged, no. Okay, good to know. No shakes are out. Plans are being made to bring the International Space Station back to Earth.