Stripped down to its core, the Cardio-Free Diet from trainer to the stars Jim Karas is basically a plan that recommends eating reduced calories and exercising three times a week. That in itself isn’t so bad, it’s when you drill down to the specifics that there are flaws.
On the nutrition side, the diet is basic and somewhat sound, though it’s often contradictory. For example, Karas declares that there are no forbidden foods on his plan, which would lead you to believe you can eat anything but perhaps in moderation. However, in the same chapter a few pages later, dieters are told to minimize or avoid processed carbohydrates, liquid carbohydrates (soda, juice) and salad dressings.
It’s the exercise portion of the book, however, where the most flaws can be found. On the very first page, the author admits that thousands of doctors, exercise physiologists and fitness experts praise the benefits of cardiovascular exercise. Yet according to Karas, all those decades of research is wrong. In fact, despite countless studies performed at hospitals and universities worldwide that show that regular cardiovascular exercise increases your endurance and aerobic capacity, strengthens your heart, reduces your risk of heart disease, diabetes and hypertension -- and burns fat and calories to boot -- the diet preaches that cardio not only doesn’t work, it also “kills your immune system” your internal organs and your entire weight-loss plan.
It seems that in order to differentiate itself from the rest of the diet plans that look strikingly similar, the book relies on theories that simply don’t ring true with any fitness organization or medical expert. They are also theories that the book simply can’t back up. Instead of citing actual studies -- or performing any studies on his own to prove his “cardio kills” theory before making such claims -- Karas refers instead to his own personal to back up his opinions instead.
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