Here is some basic information about the ancestral way of eating, also called the Paleolithic diet, among other things (Paleolithic means "old stone," as in "Old Stone Age"):
The ancestral way of eating is not so much a weight loss program--although that is a positive common side effect--as it is a health optimizer. It's the only diet based upon a fundamental explanatory model--biological evolution (or intelligent design, depending on your perspective). It's the only diet that humans are designed to eat and the only one designed by nature (or nature's God). Rather than a single, narrow fad-diet, it's actually a whole category of diets that includes a wide range of indigenous diets that were consumed by all of humanity for the first two and half million years of human existence. It is the original and longest-lasting human diet.
Paleo Foods:-Wild/Lean Meats and organs, Seafood and Eggs [and fat depots like bone marrow and perinephric fat]
-Fruits and Vegetables [I now question many of these]
-Nuts and Seeds [I now question these]
-Teas, Spices and most Herbs [I rarely use these anymore]
-Other healthy foods that are popular in many foreign cultures, but which Americans tend not to like ;-)
-Controversial foods (considered Paleo or near-Paleo by some, but not others, and may be problematic for some people): honey, fatty commercial meats, African yams, sea salt, wine, champagne, mead [I now further question these]
Don’t Eat (or strictly minimize) the Agrarian/Processed Foods:-Grains (wheat, rye, barley, corn, etc.)
-Dairy (bovine, goat, etc.)
-Beans (a.k.a. legumes; includes soy, peas and peanuts)
-Starchy root vegetables like all potatoes and tapioca
-Yeast (vinegar, pickled foods, alcoholic beverages, etc.)
-Artificial & processed additives like sweeteners, salt, etc.
-Other foods you are sensitive to (at least not at first)
Some resources:-http://www.paleodiet.com - includes many links
-http://www.thepaleodiet.com - Loren Cordain, PhD (leading scientist in the field of Paleolithic nutrition)
-http://listserv.icors.org/ARCHIVES/PALEOFOOD.HTML - Paleofood email list archives (Paleo and near-Paleo dieters)
-http://www.beyondveg.com - includes many articles
-http://ancestrallifestyle.blogspot.com - My blog
-www.ctds.info - Sandy Simmons' Connective Tissue Disorder site--good info on diet, supplements, and some disorders that result from consumption of modern foods
-www.ms-diet.org - The Multiple Sclerosis Resource Center, with info on Ashton Embry's Best Bet Diet (very close to the Paleo Diet)
-http://gluten-free.org/hoggan/ - Ron Hoggan's articles on gluten intolerance and other subjects
-www.cup.org/books/kiple/introduction1.htm - The Cambridge World History of Food
For pets:-http://dogtorj.com, website of a veterinarian who successfully treats dogs with a biologically appropriate diet
-http://www.barfworld.com, Dr. Billinghurst’s Biologically Appropriate Raw Food
There are hundreds, if not thousands, of articles and studies on this and related subjects. If you have any special health issues, like diabetes or kidney dysfunction, make sure to check with your doctor to address your special needs.