Cordain argues that chimpanzees and horses avoid meat, and they have big bellies that we would have if we didn’t ditch plants for meat. He also says meat increased human brain size, and decreased stomach size so we can have the six-pack abs that chimps can’t. But I looked at his endnotes with citations to research and couldn’t find the source for these theories. I also couldn’t find research showing that legumes and grains were invented by humans.
The best part of CFA are the people! CrossFit has really changed my life and my perspective on so much. There are so many things that CrossFit and it’s community of people, especially the women, have taught me. I’ve finally found not only an outlet I was missing since my gymnastics days, but also a group of people who continually inspire me, support me and others, and are genuinely interested in seeing their peers meet goals. CrossFit has completely solidified my viewpoint that people and relationships matter most in life.
The biggest downside of this diet is how restrictive it is. A month is a pretty long stretch to make it without taking bite of quinoa, popping a chickpea, or sneaking a sip of wine (especially if you’re a busy, social person), and the protocol does not allow for even the smallest of slip-ups. From the manual: “One bite of pizza, one spoonful of ice cream, one lick of the spoon mixing the batter within the 30-day period and you’ve broken the “reset” button, requiring you to start over again on Day 1.” (Yikes!)
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If you were to eat an unlimited amount of red meat (which the paleo diet technically allows), you may see your heart health suffer. While experts applaud the omission of packaged and processed foods like cake, cookies, chips, and candy — which are well known to be bad for your ticker — they’re not crazy about the fact that paleo doesn’t allow you to eat whole grains, legumes, and most dairy. Whole grains in particular have been linked with better cholesterol levels, as well as a reduced risk of stroke, obesity, and type 2 diabetes. (13) These are all comorbidities of heart disease. (14)
You may notice that the following meal plans do not include any snacks. This is because, technically, snacking isn’t really something you should do while on a Whole30. Just be sure you’re getting enough food at each meal (which may be hard at first as you adjust to eating whole, real food and no processed “foods”) and you won’t need to snack. If you do feel the need to eat something between meals, try to keep some cut-up veggies on hand so you’ve got something easy and quick nearby and aren’t tempted to grab something non-Whole30.
No background science here or lengthy explanations, only 15 easy guidelines to follow to kick-start your Paleo journey. It’s up to you to decide to what extent you want to follow those guidelines, but if you follow them 100% you can be assured that you are eating the best food for your body and greatly investing in your long term health and well-being.

In Defense of Food: An Eater's Manifesto by Michael Pollan gives a guided tour of 20th century food science, a history of "nutritionism" in America and a look at the marriage of government and the food industry. Then the book presents a commonsense shopping-and-eating guide, which like the paleo diet focuses on shopping the perimeter of the supermarket. He also now has a much shorter Food Rules: An Eater's Manual.
The plan focuses on unprocessed foods and foods with very minimal, or, better yet, no added ingredients. Whole30 requires dieters to cut out a lot of items, including sugar, dairy and legumes, and then slowly reintroduce these food groups back into their diets after the 30 days. The purpose of the reintroduction phase is to see if any of the foods cut out are the culprit for any health issues.
For most people the fact the Paleo diet delivers the best results is all they need. Improved blood lipids, weight loss, and reduced pain from autoimmunity is proof enough.  Many people however are not satisfied with blindly following any recommendations, be they nutrition or exercise related. Some folks like to know WHY they are doing something. Fortunately, the Paleo diet has stood not only the test of time, but also the rigors of scientific scrutiny.
The digestive abilities of anatomically modern humans, however, are different from those of Paleolithic humans, which undermines the diet's core premise.[4] During the 2.6 million year-long Paleolithic era, the highly variable climate and worldwide spread of human populations meant that humans were, by necessity, nutritionally adaptable. Supporters of the diet mistakenly presuppose that human digestion has remained essentially unchanged over time.[4][5]
Gluten is a protein found in things like rye, wheat, and barley. It’s now being said that much of our population may be gluten-intolerant (hence all the new “gluten-free!” items popping up everywhere). Over time, those who are gluten intolerant can develop a dismal array of medical conditions from consuming gluten: dermatitis, joint pain, reproductive problems, acid reflux, and more.[2]
The Great Cholesterol Con by Anthony Colpo. The definitive book on the non-dangers of dietary cholesterol and saturated fat was The Cholesterol Myths by Uffe Ravnskov, 2000. This book is six years newer. Its forward is by Uffe Ravnskov. To get a wonderful description of the book read the leading review at Amazon. The many reviews there average to 5 stars.
"Every fad diet thinks it has discovered the root of all evil," says Dr. Ochner. But nutrients in legumes, whole grains, and dairy—all of which are forbidden on the paleo diet—can help to lower the risk of osteoporosis and cardiovascular disease, reduce blood pressure, and promote a healthy weight, he says. Cutting dairy, the primary source of calcium and vitamin D in modern diets, is especially worrisome for women who want to avoid osteoporosis.
For immediate weight loss, Paleo is a great and healthy solution. But after carefully reading and considering, I’m unconvinced that Paleo is optimal for long-term health. I think, in fact, it might lead to heart disease and other ills associated with heavy meat consumption. Although many of Cordain’s theories fall apart long-term, I thoroughly enjoyed the read and highly recommend the book. You should read critically and decide for yourself.
CrossFit gyms use equipment from multiple disciplines, including barbells, dumbbells, gymnastics rings, pull-up bars, jump ropes, kettlebells, medicine balls, plyo boxes,[23] resistance bands, rowing machines, and various mats. CrossFit is focused on "constantly varied, high-intensity, functional movement,"[24] drawing on categories and exercises such as calisthenics,[25] Olympic-style weightlifting, powerlifting, Strongman-type events, plyometrics, body weight exercises, indoor rowing, aerobic exercise, running, and swimming.[26]
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