Both feeling hungry all the time and never feeling hungry are common on the Whole30 diet, especially during the first two weeks as your body adjusts to new sources of energy. Eventually, though, you shouldn’t feel those pangs since protein and fiber are filling, and you’ll get plenty of both. Plus, you’re allowed to eat as much as you want and add Whole30-compliant snacks to your meal plan, provided you truly are hungry. One small study of 29 participants published in Nutrition and Metabolism in 2010 found Paleo eaters (who have relatively similar diets to Whole30 followers) felt just as full but consumed fewer calories than their Mediterranean counterparts.
Several examples of recent and relatively speedy human evolution underscore that our anatomy and genetics have not been set in stone since the stone age. Within a span of 7,000 years, for instance, people adapted to eating dairy by developing lactose tolerance. Usually, the gene encoding an enzyme named lactase—which breaks down lactose sugars in milk—shuts down after infancy; when dairy became prevalent, many people evolved a mutation that kept the gene turned on throughout life. Likewise, the genetic mutation responsible for blue eyes likely arose between 6,000 and 10,000 years ago. And in regions where malaria is common, natural selection has modified people's immune systems and red blood cells in ways that help them resist the mosquito-borne disease; some of these genetic mutations appeared within the last 10,000 or even 5,000 years. The organisms with which we share our bodies have evolved even faster, particularly the billions of bacteria living in our intestines. Our gut bacteria interact with our food in many ways, helping us break down tough plant fibers, but also competing for calories. We do not have direct evidence of which bacterial species thrived in Paleolithic intestines, but we can be sure that their microbial communities do not exactly match our own.
Healthy, delicious, and simple, the Paleo Diet is the diet we were designed to eat. If you want to lose weight—up to 75 pounds in six months—or if you want to attain optimal health, The Paleo Diet will work wonders. Dr. Loren Cordain demonstrates how, by eating your fill of satisfying and delicious lean meats and fish, fresh fruits, snacks, and non-starchy vegetables, you can lose weight and prevent and treat heart disease, cancer, osteoporosis, metabolic syndrome, and many other illnesses.
And again, there’s no concrete scientific proof that the paleo diet wards off disease, Sandon says. Any evidence of its benefits is anecdotal. Although some studies seem to support the benefits of the paleo diet, many scientists still believe we don’t yet have enough evidence to know whether the eating approach is totally healthy and without risk. “Nobody knows the long-term effects of this diet because no one has researched it to any degree,” Sandon says. It’s not really a new concept; instead it’s one that’s been recycled through the years, she adds.
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.

I was very excited to get this book but am putting this in the "just ok" category. That said, I'm normally a huge Whole 30 fan and use the recipes from the Whole30: 30 Day Guide... all the time. Something that I appreciated from the 30 Day Guide was the simplicity of the recipes, most were kid friendly and included lots of one pot meals that work for busy people. That is not the case with the new recipe book.
As far as food goes, you’re simply going to eat a lot of fresh, good-quality eats and ditch the processed stuff. Beyond that, you’re removing all grains, dairy, soy, legumes, sugar, artificial sweeteners, and alcohol from your diet. All of these foods (especially in excess), according to the authors, have been linked to systemic inflammation, hormonal imbalance, gut issues, and more. The idea is to remove the stressors from your body and give it the nourishment and time to heal itself it needs. This means less inflammation, a healthy metabolism, hormonal harmony, a happy gut, clearer skin, and improved energy! Sounds good to me. (Although if we’re honest, I panicked a bit when I realized no cheese would hit my lips for a full month.)
You may lose weight on the Paleo Diet. If you build a “calorie deficit” into your Paleo plan – eating fewer calories than your daily recommended max or burning off extra by exercising – you should shed some pounds. How quickly and whether you keep them off is up to you. A 2015 review in the Journal of Gastrointestinal Liver Diseases concluded that a Paleo-esque diet “might be an acceptable antidote to the unhealthy Western diet, but only unequivocal results from randomized controlled trials or meta-analyses will support this hypothesis.” On that, we’re still waiting. In the meantime, here’s what has been found about the diet and others like it:

The top CrossFit Open performers for individuals and teams in each region advance to the regional events, held over the following two months around the world. Each regional event qualifies a specified number of its top finishers to send to the Games. The Games include divisions for individuals of each gender, co-ed teams, and a number of Masters and Teenage age groups.[46]
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