While the diet as a whole hasn't been well studied, the benefits of cutting packaged foods from your diet could be huge. According to the Harvard School of Public Health, three quarters of the average American's sodium intake (which is almost double what it should be!) comes from commercially prepared foods. And, one Public Health Nutrition study found that people who cook at least five times a week are 47% more likely to be alive 10 years later compared to those who rely more on processed foods.
A study published in the Journal of Strength and Conditioning Research entitled "Crossfit-based high intensity power training improves maximal aerobic fitness and body composition" followed 54 participants for 10 weeks of CrossFit training. The study said that "...a notable percentage of our subjects (16%) did not complete the training program and return for follow-up testing." The authors said "This may call into question the risk-benefit ratio for such extreme training programs..."[62] In 2014, CrossFit, Inc. filed a lawsuit against the National Strength and Conditioning Association for publishing this study, alleging that the data were false and were "intended to scare participants away from CrossFit."[63] The NSCA denies CrossFit, Inc.'s allegations[63] but has issued an erratum acknowledging that the injury data were incorrect.[64] In September 2016, the District Court ruled in favor of CrossFit Inc.'s claims that the injury data were found to be false, but not that the NSCA was commercially motivated or that the publishing of the study was defamatory as the NSCA no longer stood behind the study.[65] In February 2017, CrossFit filed for sanctions against the NSCA after one of the NSCA's witnesses admitted to falsifying statements during deposition.[66] In May 2017, the Court issued 17 issues sanctions against the NSCA, writing that the organization did have a commercial motive to falsify the data, had published the false data knowingly to disparage CrossFit, and had misled the public with their erratum.[66] CrossFit was awarded $74,000 in legal fees and allowed to continue investigating the NSCA. If the neutral-party analysis of the NSCA servers turns up any further misconduct, CrossFit may file an amended complaint for further sanctioning and compensation for lost revenue.[67]
For instance, the fat allowance of the diet may be problematic. “My biggest hang-up with the paleo diet is all of the saturated fats it promotes with all of the meats,” explains Holley, noting that you could look for a locally sourced meat, whose origin and method of raising you're aware of, as a healthier option. Saturated fat from meat has been linked with an increased risk of early death. (9)
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.
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.[49]
The NY Times had a blog article on Good News on Saturated Fat which is reporting on Gary Taubes's interpretation of the new report in The New England Journal of Medicine on a two-year diet experiment in Israel. A followup is the post The Fat Fight Goes On where Gary rebuts the arguments against the study. And here's a good interview with Taubes (and includes a good summary): Gary Taubes on Cold Fusion, Good Nutrition and What Makes Bad (and Good) Science.
Cancer: Disease of Civilization? An anthropological and historical study by Vilhjalmur Stefansson. This classic shows what happens before and after tribes were "civilized." Covers day-to-day experience of Eskimo life. Published in 1960. Used copies are available at a steep price. To read it get it on inter-library loan. Another of his many books My Life with the Eskimo (New Edition) is available.
So what does the science say about the paleo diet? Some research suggests that the health claims hold truth. A review analyzed four randomized, controlled trials with 159 participants, and researchers found that the paleo diet led to more short-term improvements in some risk factors for chronic disease (including waist circumference and fasting blood sugar) compared with other control diets. (4)
Downsides: Prepare for a bit of a rise in grocery cost. Prepared foods cost less than whole foods. This is American governmental ag subsidies in a nutshell. It's unfortunate and unfair, but true. Also, as others have mentioned, you will be in the kitchen more. Again, it helps if one of you cooks and the other cleans up. It's a little annoying to be sure, but the results are more than worth the annoyances. It is also very difficult to eat out. You pretty much are limited to places that are expensive and accommodating, delis where you know and trust the ingredients, or Chipotle. Again, the slight isolation (if you can do this or at least begin it when you have a little time to spare and don't have a lot of socializing) helped.

It was within this context that Glassman began ramping up his affiliation program. This was growth without a safety net: Anyone who passed his two-day seminar could apply to open a box, call it CrossFit, and then rush paying customers through squats and snatches or whatever crazy WOD they dreamed up. To Glassman, himself a passionate libertarian, this was the right thing to do: He wants his affiliates to be free to open up a box in a garage or a warehouse or wherever else, and train how they want, and charge what they want. They should have the opportunity he had. He detests supposed experts who say their certification or education makes them better than him or his people. At the end of the day, he believes, the free market will provide all the necessary quality control.
Between 2009 and 2018, competitors qualified for the Games through participation at CrossFit Games regional events. For the 2019 Games, CrossFit, Inc. discontinued hosting the Regional qualifier and instead sanctioned independent fitness events as qualifiers separate from the Open. Most of the sanctioned events were already widely participated in by CrossFit Games athletes, often used as a part of off-season training, around the world. Each sanctioned event has its own rules for participation, but athletes that attend the sanctioned events are either by invite or through the event's qualification process.
A study published in the European Journal of Clinical Nutrition compared the benefits of following a Paleo diet versus a diet recommended by the American Diabetes Association in 24 participants with diabetes. After two weeks, researchers found that the Paleo diet led to greater improvements in blood sugar levels and insulin sensitivity than the conventional diabetes diet. (4)
The Paleolithic or “Paleo” diet seeks to address 21st century ills by revisiting the way humans ate during the Paleolithic era more than 2 million years ago. Paleo proponents state that because our genetics and anatomy have changed very little since the Stone Age, we should eat foods available during that time to promote good health. Our predecessors used simple stone tools that were not advanced enough to grow and cultivate plants, so they hunted, fished, and gathered wild plants for food. If they lived long enough, they were believed to experience less modern-day diseases like diabetes, cancer, and heart disease because of a consistent diet of lean meats and plant foods along with a high level of physical activity from intensive hunting. However, the life expectancy of our predecessors was only a fraction of that of people today.
That severe carb restriction is meant to keep your body in a state of ketosis, says Alyssa Cohen, R.D. “Ketosis refers to the state of relying on ketone bodies for fuel,” Cohen explains. “Fat is the source used to make ketone bodies, so this diet aims to use fuel from fat, rather than carbohydrates [what our bodies primarily use for energy].” So basically, the keto diet helps you speed up the weight-loss process through fat burning.
Beginners to weight training – If you have NEVER weight trained before (or trained only on machines), CrossFit is a great place for you to start (provided you have a great coach, which I’ll cover shortly). You’ll learn how to do all of the important lifts in a super supportive and nonjudgmental environment. You might even find that…GASP…you love strength training!

CrossFit, Inc. licenses the CrossFit name to gyms for an annual fee and certifies trainers.[37] Besides the standard two-day[38] "Level 1 Trainer Course",[39] specialty seminars include gymnastics, Olympic weightlifting, powerlifting, strongman, running and endurance, rowing, kettlebells, mobility and recovery, CrossFit Kids, CrossFit Football, and self-defense and striking. Other specialized adaptations include programs for pregnant women, seniors, and military special operations candidates.[40] Affiliates develop their own programming, pricing, and instructional methods. Many athletes and trainers see themselves as part of a contrarian, insurgent movement that questions conventional fitness wisdom.[41] In addition to performing prescribed workouts, they follow CrossFit's nutrition recommendations, adopting a paleo and/or zone diet.[42]

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