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The Zone Diet

The Zone Diet: Main Image

Why Do People Follow This Diet?

The Zone Diet is popular among people desiring to lose weight. Even though the diet is low in calories, it contains enough fat to provide a sense of fullness. In addition, normalizing insulin levels can eliminate food cravings, making it easier for dieters to not cheat. Many athletes seek to live in “the Zone” because they believe following the diet leads to improvements in body composition and enhances athletic performance. The Zone Diet is also popular among people with non-insulin dependent diabetes, as it is believed to help normalize blood sugar levels.

What Do the Advocates Say?

Advocates of the Zone Diet contend that living “in the Zone” improves energy levels, mental clarity, physical endurance, and promotes weight loss. Dr. Sears has worked with many elite athletes and attributes their success in competitive events to his diet.

What Do the Critics Say?

Critics point to the fact that there is little research to support Dr. Sears’ claim that his exact proportion of carb-to-protein intake yields the best insulin response. They believe that his classification of “good” and “bad” eicosanoids is oversimplified and misleading.

Most nutrition professionals favor a high-complex-carbohydrate, low-fat diet for general health and weight loss. They caution that high-protein, low-carbohydrate diets lack key nutrients for health, including dietary fiber, vitamin C, folic acid, and several minerals. In addition, the high intake of meat products necessary to meet the protein requirements of the Zone Diet may place certain individuals at risk of heart disease due to increased intake of saturated fat and cholesterol. Persons with kidney failure are also warned to stay away from the diet, as high amounts of protein increase the amount of nitrogen-containing waste products the kidneys must process for elimination.

Critics of the Zone Diet concede that people who follow the diet carefully often experience significant weight loss. However, they point out that the Zone Diet is low in overall calories, with the average person taking in only 1,500 to 1,750 calories per day, and caution that the strict, and confusing, nature of the diet makes it difficult to follow. As a result, long-term compliance—and therefore lasting weight loss—with this diet is unlikely. Moreover, any diet low enough in calories will result in weight loss, regardless of its proportions of protein, carbohydrate, and fat.

Not all sports nutritionists and athletes believe that the Zone Diet is ideal for athletic training and performance. A significant amount of research in the field of exercise physiology has shown that fatigue during exercise is primarily caused by depletion of the body’s stored carbohydrates (called glycogen). Most athletes’ glycogen stores are depleted within 90 minutes of intense exercise, leaving muscles without any source of energy to fuel activity. As a result, many experts believe that a sufficient intake of carbohydrates before and during exercise is crucial for increasing endurance.

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The information presented by TraceGains is for informational purposes only. It is based on scientific studies (human, animal, or in vitro), clinical experience, or traditional usage as cited in each article. The results reported may not necessarily occur in all individuals. Self-treatment is not recommended for life-threatening conditions that require medical treatment under a doctor's care. For many of the conditions discussed, treatment with prescription or over the counter medication is also available. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements or before making any changes in prescribed medications. Information expires December 2024.

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