The Zone diet is a diet popularized in books by Barry Sears. It advocates balancing protein and carbohydrate ratios instead of caloric thinking as an approach to eating. It is not primarily a weight-loss "diet" (though it can be used quite successfully for that purpose ^[1]); rather it is a way of eating — the intake of food that produces the best results within the human body based on a hypothesis of how it has evolved to cope with varying food intake through the ages. Measuring body weight on a scale Dieting is the practice of ingesting food in a regulated fashion to achieve a particular objective. ... The Zone diet is a diet popularized in books by Barry Sears. ... A calorie is a unit of measurement for energy. ... This article needs additional references or sources for verification. ...

"The Zone" is Sears' term for proper hormone balance. When insulin levels are neither too high nor too low, and glucagon levels are not too high, then specific anti-inflammatory chemicals (types of eicosanoids) are released, which have similar effects to aspirin, but without downsides such as gastric bleeding. Sears claims that a 30:40 ratio of protein to carbohydrates triggers this effect, and this is called 'The Zone.' Sears claims that these natural anti-inflammatories are heart and health friendly. Norepinephrine A hormone (from Greek όρμή - to set in motion) is a chemical messenger from one cell (or group of cells) to another. ... Insulin (from Latin insula, island, as it is produced in the Islets of Langerhans in the pancreas) is a polypeptide hormone that regulates carbohydrate metabolism. ... In biochemistry, eicosanoids are a class of oxygenated hydrophobic hormones that largely function as paracrine mediators. ...

Additionally, the human body in caloric balance is more efficient and does not have to store excess calories as fat. The human body cannot store fat and burn fat at the same time, and Sears believes it takes time (significant time if insulin levels were high because of unbalanced eating) to switch from the former to the latter.^{[citation needed]} Using stored fat for energy causes weight loss. The diet centers on a "40:30:30" ratio of calories obtained daily from carbohydrates, proteins, and fats, respectively. The exact formula is always under debate, but studies over the past several years (including a non-scientific study by the PBS documentary show Scientific American Frontiers) have shown that it can produce weight loss at reasonable rates. The Scientific American Frontiers study compared the effectiveness of several popular 'diet' regimes including the Zone; somewhat to the surprise of the show's staff, the participants on the Zone experienced the greatest fat loss while simultaneously gaining muscle mass. Participants also reported the Zone as the easiest regime to adjust to, i.e. having the fewest adverse affects such as fatigue or hunger. Lactose is a disaccharide found in milk. ... A representation of the 3D structure of myoglobin, showing coloured alpha helices. ... Fats consist of a wide group of compounds that are generally soluble in organic solvents and largely insoluble in water. ... Scientific American Frontiers is an American television program primarily focused on informing the public about new technologies and discoveries in science and medicine. ... Scientific American Frontiers is an American television program primarily focused on informing the public about new technologies and discoveries in science and medicine. ...

Another key feature of the Zone diet, introduced in his later books, is an intake of the proper ratio of Omega-3 to Omega-6 fatty acids. Dr. Sears is believed to have popularized the taking of pharmaceutical grade Omega 3 fish oils.^[2] Omega-3 fatty acids are polyunsaturated fatty acids found in certain fish tissues, and in vegetable sources such as flax seeds, walnuts, and canola oil. ... Omega-6 fatty acids are fatty acids where the term omega-6 signifies that the first double bond in the carbon backbone of the fatty acid, counting from the end opposite the acid group, occurs in the sixth carbon-carbon bond. ...

Hormonal paradoxes

Sears emphasizes a hormonal paradox of which "low-fat" advocates were unaware, namely that low-fat diets increase the production of the hormone insulin, causing the body to store more fat. He points to the cattle ranching practice of fattening livestock efficiently by feeding them lots of low-fat grain. He and others have noted the irony that human diets in the West for the last twenty years have been full of low-fat carbohydrates, yet people are more obese. Insulin (from Latin insula, island, as it is produced in the Islets of Langerhans in the pancreas) is a polypeptide hormone that regulates carbohydrate metabolism. ... Binomial name Bos taurus Linnaeus, 1758 Cattle (often called cows in vernacular and contemporary usage, or kye as the Scots plural of cou) are domesticated ungulates, a member of the subfamily Bovinae of the family Bovidae. ...

Additionally, Sears describes fat consumption as essential for "burning" fat. Monounsaturated fats in a meal contribute to a feeling of fullness and decreases the rate at which carbohydrates are absorbed into the bloodstream. Slower carbohydrate absorption means lower insulin levels which means less stored fat and a faster transition to fat burning. If the body needs energy and can't burn fat because of high insulin levels, a person feels tired as their brain starves and metabolism slows to compensate. This occurs because the brain runs on glucose and high insulin levels deplete blood glucose levels. Such condition, rebound hypoglycemia causes sweet cravings(which just starts the high-insulin cycle all over again). In nutrition, monounsaturated fats are fatty acids with one double-bonded carbon in the molecule, with all of the others single-bonded carbons, in contrast to polyunsaturated fatty acids which have more than one double bond. ... Hypoglycemia (hypoglycæmia in the UK) is a medical term referring to a pathologic state produced by a lower than normal level of sugar (glucose) in the blood. ...

Sears describes a Zone meal as follows. Eat as much protein as the palm of your hand, as much nonstarchy raw vegetables as you can stand for the vitamins, enough carbohydrates to maintain mental clarity because the brain runs on glucose, and enough monounsaturated oils to keep feelings of hunger away.

The "low-carb craze"

Low-carbohydrate diets like the Atkins diet became extremely popular throughout the United States in 2003 and 2004, but Sears claims that they miss the point. According to him, they ignore the importance of hormonal balance, as well as the influence of dietary balance on digestion and hormone production. In addition, high-protein/low-carb diets cause the production of some "bad" hormones and ketone bodies that the body tries to flush from the system. Much of the initial weight-loss from such diets is water loss. Low-carbohydrate diets or low carb diets are nutritional programs that advocate restricted carbohydrate consumption, based on research that ties consumption of certain carbohydrates with increased blood insulin levels, and overexposure to insulin with metabolic syndrome (the most recognized symptom of which is obesity). ... The Atkins Nutritional Approach, popularly known as the Atkins Diet or just Atkins, is the most marketed and well-known of the low-carbohydrate diets. ... This article or section does not cite any references or sources. ...

The Zone in Italy

The introduction of the Zone in Italy began in 1997 by a physician, Aronne Romano M.D. who applied this nutritional style to patients and athletes. Since the 2nd edition of the book "Come Raggiungere la Zona" (The Zone), in 1999, the Chef Memo Romano and his brother Aronne modified the original recipes and menu to suit the local food and habits. The diffusion of the Zone continues with the efforts of many people including Paolo Perucci, Gigliola Braga, Simone Masci and Daniela Morandi.

Criticism

The American Heart Association does not recommend the Zone Diet due to high-protein, lack of essential nutrients and little information on long-term effects.^[3] It should be noted that AMA's characterization of the the Zone diet as 'high-protein' is false, or at least a serious exaggeration, given that 70% of the calories in the Zone diet come from non-protein sources(i.e. carbohydrates, 40%, and fats 30%). The Zone does not emphasize an increase of protein intake in the standard American diet, but rather, a reduction in the intake of unhealthy carbohydrates (i.e. refined breads, starches, sugars, etc.) and an increase in healthy carbohydrates from high-fiber vegetables and fruits.

A vegetarian diet, according to Sears, is as far as you can get from The Zone. Individuals who promote a vegetarian diet are critical of Zone and similar diets.

Dr. Barry Sears “Zone” Books

(Partial list)

• Sears, Barry (1995). The Zone: A Dietary Road Map. HarperCollins Publishers. ISBN 0060987065.  Sears's initial book on the Zone diet.
• Sears, Barry (1997). Mastering the Zone. HarperCollins Publishers. ISBN 006101124X.  Sears urges substitution of raw vegetables for pastas, breads and refined sugars. More diagrams and flowcharts than in The Zone.
• Sears, Barry (1999). The Anti-Aging Zone. Regan Books. ISBN 0060392436.  Information on meditation, relaxation and exercise in addition to diet.
• Sears, Barry; Kotz, Deborah (2000). A Week in the Zone: A Quick Course in the Healthiest Diet for You. Regan Books. ISBN 0060741902. 
• Sears, Barry (2000). The Soy Zone. Regan Books. ISBN 0060393106.  Discusses Sears preference for soy protein as part of his balanced eating program. "The longest-living people in the world" living in Okinawa, Japan consume much greater amounts of soy protein and eat smaller meals than most other people.
• Sears, Barry (2002). The Omega Rx Zone: The Miracle of the New High-Dose Fish Oil. Regan Books. ISBN 0060393130.  Discusses "high-dose fish oil;" a newly introduced invented pharmaceutical grade fish oil that Sears touts as a medical miracle that will put the eicasonids in balance and reduce inflammation. Extra virgin olive oil is also promoted for its phytochemicals.
• Sears, Barry (2005). The Anti-Inflammation Zone: Reversing the Silent Epidemic That's Destroying Our Health. Regan Books. ISBN 0060834145. 

This article is about the prefecture. ...

See also

• List of diets
• Diet (nutrition)
• Paleodiet a diet with similar ratios

Well-known nutritional diets: Abs Diet Atkins diet Banta Diet Best Bet Diet Blood Type diet Body for Life Breatharian diet Buddhist diet Cabbage soup diet Calorie restriction The Cambridge Diet Candida control diet Diabetic diet Dietary Approaches to Stop Hypertension or the DASH Diet Dr. Hay diet Detox diet... In nutrition, the diet is the sum of food consumed by a person or other organism. ... The Paleolithic diet is a dietary system. ...

Notes

1. ^ http://www.foxnews.com/story/0,2933,257620,00.html
2. ^ http://www.amazon.com/Anti-Inflammation-Zone-Reversing-Epidemic-Destroying/dp/0060595469
3. ^ http://www.americanheart.org/presenter.jhtml?identifier=11234

External links

• Dr. Barry Sears' Official Website
• ZONE Diet Online
• The Zone Diet in New York, L.A. and Toronto
• American Heart Association