I don't know if I can post links ... but just Google "Paleolithic diet" (ro neanderthin or cave man or stone age followed by diet)
There have been a few books written PaleoDiet by Cordain and NeanderThin by Audette. i have NOT read either, but from what I've heard I don't agree with them. I think they both tout lean meats (Which I DON'T follow) and Cordain talks about athletes carb loading (!!!) before exercise. That's just bunk, IMHO.
Simply put, the theory is that we ate a certain way for 2 million years before the advent of agriculture and we have only been eating grains, potatoes, legumes, modern sugar-bomb fruits, nightshades, dairy, sugar, etc, etc for 10,000 years or less and our bodies just haven't evolved to handle them.
So basically *I* eat: MEAT - the fatter the better, EGGS, non-starchy, non Nightshade VEGGIES.
I also eat a v. small amt of dairy but that's my non-paleo choice, lol.
And OMG, I have sooooo much energy! And I'm actually stuffed full for hours after a meal and don't get any cravings. It's wonderful for me.
When I reach my goal weight I'll add nuts, seeds, and v. low sugar fruits. Those are Paloe but just on hold while I'm "dieting".