When people ask me what the key to the paleo diet is, there are a few different ways I answer based on who is asking the question. If you’re looking for a high level answer, anthropologists say, 2.5 million years of man, 10,000 years of agriculture, 10,000 years of cancer, heart disease, diabetes. There are no traces of these diseases, among others, in the bones of ancestors more than 10,000 years ago. Go back to the dietary profile of hunter gatherer and abandon the dietary profile of the settled farmer. If you’re looking for an answer more applicable to your everyday living, stop eating grains, dairy, and sugar and your overall health will significantly improve. If you’re looking for the granular detail as to why the paleo diet is a better way of eating, it’s all about your omega 6 to omega 3 fat intake ratio. Caveman ate omega 6 and omega 3 fats at the ratio of 1:1, where are modern, western diets are close to 15:1. This imbalance has a tremendous impact on our bodies. Where do omega 6 fats come from? Grains. If we’re going to lower our omega 6 intake and raise our omega 3 intake to bring that ratio closer to 1:1, we have to stop eating grains and start eating fish. American, corn fed beef is very high in omega 6 simply because corn is high in omega 6. Grass fed beef has a much lower ratio simply because it’s not eating high omega 6 grain feed. Fish is the highest source of omega 3. Eat more fish and stop eating grains. Please read about scientific studies of Omega 6/3 imbalance on my Favorite Links page.