Research into the weight loss effects of the paleolithic diet has generally been of poor quality.[10] One trial of obese postmenopausal women found improvements in weight and fat loss after six months, but the benefits had ceased by 24 months; side effects among participants included "weakness, diarrhea, and headaches".[10] Any weight loss caused by the diet was merely the result of calorie restriction, rather than a special feature of the diet itself.[10]
"Loren Cordain's extensive research demonstrates how modern westernized diets drastically depart from the original diet humans consumed for millions of years. In The Paleo Diet and The Paleo Diet Cookbook, Dr. Cordain shows how diets high in grains, dairy, vegetable oils, salt, and refined sugars are at odds with our genetic legacy and then shares his uncomplicated strategy for losing weight and getting healthy."

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The toe to bar requires an athlete start each set at a dead hang from a pull-up bar, with shoulders, arms, hips and legs at full extension. Each repetition consists of an athlete bringing both feet behind the perpendicular vertical plain created by the pull-up bar, and finishes with both feet simultaneously in contact with the pull-up bar, between the athlete’s hands.
The Santa Cruz mornings and evenings became packed with fitness clients. The stretch of day in between grew into a time of study and reflection. He had a friend bring in printouts of fitness articles the friend had found using his newfangled Internet connection. "I went through thousands of pages like that," says Glassman. "When I finally got a computer, there was nothing on the Web on fitness I hadn't already seen."
"CrossFit is not a specialized fitness program, but a deliberate attempt to optimize physical competence in each of 10 recognized fitness domains," says founder Greg Glassman in the Foundations document. Those domains are cardiovascular and respiratory endurance, stamina, strength, flexibility, power, speed, coordination, agility, balance, and accuracy.[33]
Since 2009, Melissa Hartwig’s critically-acclaimed Whole30 program has quietly led hundreds of thousands of people to effortless weight loss and better health—along with stunning improvements in sleep quality, energy levels, mood, and self-esteem. The program accomplishes all of this by specifically targeting people’s habits and emotional relationships with food. The Whole30 is designed to help break unhealthy patterns of behavior, stop stress-related comfort eating, and reduce cravings, particularly for sugar and carbohydrates. Many Whole30 participants have described achieving “food freedom”—in just thirty days.
CrossFit is a strength and conditioning program consisting mainly of a mix of aerobic exercise, calisthenics (body weight exercises), and Olympic weightlifting.[19] CrossFit, Inc. describes its strength and conditioning program as "constantly varied functional movements executed at high intensity across broad time and modal domains,"[20] with the stated goal of improving fitness, which it defines as "work capacity across broad time and modal domains."[21] Hour-long classes at affiliated gyms, or "boxes", typically include a warm-up, a skill development segment, the high-intensity "workout of the day" (or WOD), and a period of individual or group stretching. Some gyms also often have a strength-focused movement prior to the WOD. Performance on each WOD is often scored and/or ranked to encourage competition and to track individual progress. Some affiliates offer additional classes, such as Olympic weightlifting, which are not centered around a WOD.[22]
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