Low-carbohydrate diet(Redirected from Low carbohydrate diet)
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Low-carbohydrate diets or low-carb diets are dietary programs that restrict carbohydrate consumption. Foods high in easily digestible carbohydrates (e.g., sugar, bread, pasta) are limited or replaced with foods containing a higher percentage of fats and moderate protein (e.g., meat, poultry, fish, shellfish, eggs, cheese, nuts, and seeds) and other foods low in carbohydrates (e.g., most salad vegetables such as spinach, kale, chard and collards), although other vegetables and fruits (especially berries) are often allowed. The amount of carbohydrate allowed varies with different low-carbohydrate diets.
Low carbohydrate diets typically stipulate getting less than 40% of calorie intake from carbohydrates. Some diets restrict carbohydrate intake sufficiently to cause ketosis.
Definition and classificationEdit
Low-carbohydrate diets are not well-defined. The American Academy of Family Physicians defines low-carbohydrate diets as diets that restrict carbohydrate intake to 20 to 60 grams per day, typically less than 20% of caloric intake. A 2016 review of low-carbohydrate diets classified diets with 50g of carbohydrate per day (less than 10% of total calories) as "very low" and diets with 40% of calories from carbohydrates as "mild" low-carbohydrate diets.
A popular misconception driving adoption of the diet for weight loss, is that by reducing carbohydrate intake dieters can in some way avoid weight gain from the calories in other macronutrients. However any weight loss resulting from a low-carbohydrate diet comes from a reduced overall calorie intake not from "metabolic hocus pocus".
A category of diets is known as low-glycemic-index diets (low-GI diets) or low-glycemic-load diets (low-GL diets), in particular the Low GI Diet. The low-insulin-index diet, is similar, except it is based on measurements of direct insulemic responses i.e., the amount of insulin in the bloodstream to food rather than glycemic response the amount of glucose in the bloodstream. Although such diet recommendations mostly involve lowering nutritive carbohydrates, some low-carbohydrate foods are discouraged, as well (e.g., beef).
As with other diet plans, people who maintain a low-carbohydrate diet lose weight. In the case of low-carbohydrate diets, weight loss is helped by the increased feeling of fullness and a tendency towards selecting nutrient-rich food. A very low-carbohydrate diet performs slightly better than a low-fat diet for long-term weight loss. The long-term effects of a low-carbohydrate diet are not known.
Limiting carbohydrate consumption is a traditional treatment for diabetes – indeed, it was the only effective treatment before the development of insulin therapy – and when carefully adhered to, it generally results in improved glucose control, usually without long-term weight loss. Some experts recommend a low-carbohydrate diet as the first, default treatment for people with diabetes. There is mixed evidence to support the use of low-carbohydrate diets for people with diabetes in the short-term, but no good evidence of long-term benefit or safety. Safety is a concern if the diet is taken without expert monitoring.
Potential favorable changes in triglyceride and high-density lipoprotein cholesterol values should be weighed against potential unfavorable changes in low-density lipoprotein cholesterol and total cholesterol values when low-carbohydrate diets to induce weight loss are considered. A 2008 systematic review of randomized controlled studies that compared low-carbohydrate diets to low-fat/low-calorie diets found the measurements of weight, HDL cholesterol, triglyceride levels, and systolic blood pressure were significantly better in groups that followed low-carbohydrate diets. The authors of this review also found a higher rate of attrition in groups with low-fat diets, and concluded, "evidence from this systematic review demonstrates that low-carbohydrate/high-protein diets are more effective at six months and are as effective, if not more, as low-fat diets in reducing weight and cardiovascular disease risk up to one year", but they also called for more long-term studies.
As of 2014 it appeared that with respect to the risk of death for people with cardiovascular disease, the kind of carbohydrates consumed are important; diets relatively higher in fiber and whole grains lead to reduced risk of death from cardiovascular disease. High refined-grain diets do not.
Opinions from major governmental and medical organizationsEdit
- American Dietetic Association
As of 2003 in commenting on a study in the Journal of the American Medical Association, a spokesperson for the American Dietetic Association reiterated the association's position that "there is no magic bullet to safe and healthful weight loss." The Association specifically endorses the high-carbohydrate diet recommended by the National Academy of Sciences. As part of the National Nutrition Month "Fact vs. Fiction" campaign in 2008, the ADA stated: "Calories cause weight gain. Excess calories from carbohydrates are not any more fattening than calories from other sources."
- American Heart Association
As of 2015[update] the AHA stated categorically that it doesn't recommend high-protein diet. It states: "The American Heart Association doesn't recommend high-protein diets for weight loss. Some of these diets restrict healthful foods that provide essential nutrients and don't provide the variety of foods needed to adequately meet nutritional needs. People who stay on these diets very long may not get enough vitamins and minerals and face other potential health risks." A science advisory from the association further states the association's position that these diets may be associated with increased risk for coronary heart disease. Robert H. Eckel, past president, noted that a low-carbohydrate diet could potentially meet AHA guidelines if it conformed to the AHA guidelines for low fat content.
- Australian Heart Foundation
The position statement by the Heart Foundation regarding low-carbohydrate diets states: "the Heart Foundation does not support the adoption of VLCARB diets for weight loss."
Low-carbohydrate diets became a major weight loss and health maintenance trend during the late 1990s and early 2000s. While their popularity has waned recently from its peak, they remain popular. This diet trend has stirred major controversies in the medical and nutritional sciences communities and, as yet, there is not a general consensus on their efficacy or safety. Many in the medical community remain generally opposed to these diets for long term health although there has been a recent softening of this opposition by some organizations.
Because of the substantial controversy regarding low-carbohydrate diets, and even disagreements in interpreting the results of specific studies, it is difficult to objectively summarize the research in a way that reflects scientific consensus.
Although there has been some research done throughout the twentieth century, most directly relevant scientific studies have occurred in the 1990s and early 2000s and, as such, are relatively new and the results are still debated in the medical community. Supporters and opponents of low-carbohydrate diets frequently cite many articles (sometimes the same articles) as supporting their positions. One of the fundamental criticisms of those who advocate the low-carbohydrate diets has been the lack of long-term studies evaluating their health risks. This has begun to change as longer term studies are emerging.
A 2012 systematic review studying the effects of low-carbohydrate diet on weight loss and cardiovascular risk factors showed the LCD to be associated with significant decreases in body weight, body mass index, abdominal circumference, blood pressure, triglycerides, fasting blood sugar, blood insulin and plasma C-reactive protein, as well as an increase in high-density lipoprotein cholesterol (HDL). Low-density lipoprotein cholesterol (LDL) and creatinine did not change significantly. The study found the LCD was shown to have favorable effects on body weight and major cardiovascular risk factors (but concluded the effects on long-term health are unknown). The study did not compare health benefits of LCD to low-fat diets.
A meta-analysis published in the American Journal of Clinical Nutrition in 2013 compared low-carbohydrate, Mediterranean, vegan, vegetarian, low-glycemic index, high-fiber, and high-protein diets with control diets. The researchers concluded that low-carbohydrate, Mediterranean, low-glycemic index, and high-protein diets are effective in improving markers of risk for cardiovascular disease and diabetes.
Criticism and controversiesEdit
Advocates of low-carbohydrate diets generally dispute any suggestion that such diets cause weakness or exhaustion (except in the first few weeks as the body adjusts), and indeed most highly recommend exercise as part of a healthy lifestyle.
Arctic cultures, such as the Inuit, were found to lead physically demanding lives consuming a diet of about 15–20% of their calories from carbohydrates, largely in the form of glycogen from the raw meat they consumed. However, studies also indicate that while low-carb diets will not reduce endurance performance after adapting, they will probably deteriorate anaerobic performance such as strength-training or sprint-running because these processes rely on glycogen for fuel.
Vegetables and fruitsEdit
Some critics imply or explicitly argue that vegetables and fruits are inherently all heavily concentrated sources of carbohydrates (so much so that some sources treat the words 'vegetable' and 'carbohydrate' as synonymous). While some fruits may contain relatively high concentrations of sugar, most are largely water and not particularly calorie-dense. Thus, in absolute terms, even sweet fruits and berries do not represent a significant source of carbohydrates in their natural form, and also typically contain a good deal of fiber which attenuates the absorption of sugar in the gut. Lastly, most of the sugar in fruit is fructose, which has a reported negligible effect on insulin levels in obese subjects.
Most vegetables are low- or moderate-carbohydrate foods (in the context of these diets, fiber is excluded because it is not a nutritive carbohydrate). Some vegetables, such as potatoes, have high concentrations of starch, as do corn and rice. Most low-carbohydrate diet plans accommodate vegetables such as broccoli, spinach, cauliflower, and peppers. The Atkins diet recommends that most dietary carbs come from vegetables. Nevertheless, debate remains as to whether restricting even just high-carbohydrate fruits, vegetables, and grains is truly healthy.
Contrary to the recommendations of most low-carbohydrate diet guides, some individuals may choose to avoid vegetables altogether to minimize carbohydrate intake. Low-carbohydrate vegetarianism is also practiced.
Raw fruits and vegetables are packed with an array of other protective chemicals, such as vitamins, flavonoids, and sugar alcohols. Some of those molecules help safeguard against the over-absorption of sugars in the human digestive system. Industrial food raffination depletes some of those beneficial molecules to various degrees, including almost total removal in many cases.
Some evidence indicates the increasingly large percentage of calories consumed as refined carbohydrates is positively correlated with the increased incidence of metabolic disorders such as type 2 diabetes.
Analyses which neglect these factors are misleading and will not result in a working diet, or at least one which works as intended. In fact, some evidence indicates the human brain – the largest consumer of glucose in the body – can operate more efficiently on ketones (as efficiency of source of energy per unit oxygen).
In 2004, the Canadian government ruled that foods sold in Canada could not be marketed with reduced or eliminated carbohydrate content as a selling point, because reduced carbohydrate content was not determined to be a health benefit. The government ruled that existing "low carb" and "no carb" packaging would have to be phased out by 2006.
Early dietary scienceEdit
In 1797, John Rollo reported on the results of treating two diabetic Army officers with a low-carbohydrate diet and medications. A very low-carbohydrate, ketogenic diet was the standard treatment for diabetes throughout the nineteenth century.
In 1863, William Banting, a formerly obese English undertaker and coffin maker, published "Letter on Corpulence Addressed to the Public", in which he described a diet for weight control giving up bread, butter, milk, sugar, beer, and potatoes. His booklet was widely read, so much so that some people used the term "Banting" for the activity usually called "dieting".
In the early 1900s Frederick Madison Allen developed a highly restrictive short term regime which was described by Walter R. Steiner at the 1916 annual convention of the Connecticut State Medical Society as The Starvation Treatment of Diabetes Mellitus.:176–177 People showing very high urine glucose levels were confined to bed and restricted to an unlimited supply of water, coffee, tea, and clear meat broth until their urine was "sugar free"; this took two to four days but sometimes up to eight.:177 After the person's urine was sugar-free food was re-introduced; first only vegetables with less than 5g of carbohydate per day, eventually adding fruits and grains to build up to 3g of carbohydrate per kilogram of body weight. Then eggs and meat were added, building up to 1g of protein/kg of body weight per day, then fat was added to the point where the person stopped losing weight or a maximum of 40 calories of fat per kilogram per day was reached. The process was halted if sugar appeared in the person's urine.:177–178 This diet was often administered in a hospital in order to better ensure compliance and safety.:179
Modern low-carbohydrate dietsEdit
In 1958, Richard Mackarness M.D. published Eat Fat and Grow Slim, a low-carbohydrate diet with much of the same advice and based on the same theories as those promulgated by Robert Atkins more than a decade later. Mackarness also challenged the "calorie theory" and referenced primitive diets such as the Inuit as examples of healthy diets with a low-carbohydrate and high-fat composition.
In 1967, Irwin Stillman published The Doctor's Quick Weight Loss Diet. The "Stillman diet" is a high-protein, low-carbohydrate, and low-fat diet. It is regarded as one of the first low-carbohydrate diets to become popular in the United States. Other low-carbohydrate diets in the 1960s included the Air Force diet and the drinking man's diet. Austrian physician Wolfgang Lutz published his book Leben Ohne Brot (Life Without Bread) in 1967. However, it was not well known in the English-speaking world.
In 1972, Robert Atkins published Dr. Atkins Diet Revolution, which advocated the low-carbohydrate diet he had successfully used in treating patients in the 1960s (having developed the diet from a 1963 article published in JAMA). The book met with some success, but, because of research at that time suggesting risk factors associated with excess fat and protein, it was widely criticized by the mainstream medical community as being dangerous and misleading, thereby limiting its appeal at the time.
The concept of the glycemic index was developed in 1981 by David Jenkins to account for variances in speed of digestion of different types of carbohydrates. This concept classifies foods according to the rapidity of their effect on blood sugar levels – with fast-digesting simple carbohydrates causing a sharper increase and slower-digesting complex carbohydrates, such as whole grains, a slower one.
1990s – presentEdit
In the 1990s, Atkins published an update from his 1972 book, Dr. Atkins New Diet Revolution, and other doctors began to publish books based on the same principles. This has been said to be the beginning of what the mass media call the "low carb craze" in the United States. During the late 1990s and early 2000s, low-carbohydrate diets became some of the most popular diets in the US. By some accounts, up to 18% of the population was using one type of low-carbohydrate diet or another at the peak of their popularity. Food manufacturers and restaurant chains like Krispy Kreme noted the trend, as it affected their businesses. Parts of the mainstream medical community has denounced low-carbohydrate diets as being dangerous to health, such as the AHA in 2001 and the American Kidney Fund in 2002 Low-carbohydrate advocates did some adjustments of their own, increasingly advocating controlling fat and eliminating trans fat.
In the United States, the diet has continued to garner attention in the medical and nutritional science communities, and also inspired a number of hybrid diets that include traditional calorie-counting and exercise regimens.
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"The findings confirm what we already know," said registered dietitian and American Dietetic Association spokesperson Kathleen Zelman. "There is no magic bullet to safe and healthful weight loss." Zelman added: "In the short term, these studies show, you can achieve weight loss with low-carb diets. But in the long term, success rates were not different from people who are on a more 'traditional' diet. These results don't change ADA's recommendations for achieving healthful weight that can be sustained over a lifetime." ADA's advice is based on the National Academy of Sciences' recommendations that adults obtain 45 percent to 65 percent of their calories from carbohydrates, 20 percent to 35 percent from fat and 10 percent to 35 percent from protein.
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These diets are generally associated with higher intakes of total fat, saturated fat, and cholesterol because the protein is provided mainly by animal sources. ... Beneficial effects on blood lipids and insulin resistance are due to the weight loss, not to the change in caloric composition. ... High-protein diets may also be associated with increased risk for coronary heart disease due to intakes of saturated fat, cholesterol, and other associated dietary factors.
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- Based on current available evidence, the Heart Foundation does not support the adoption of VLCARB diets for weight loss.
- The Heart Foundation found that subjects in research studies achieved more weight and fat loss on the VLCARB diets than on the conventional low fat diets, but this was only in the short term.
- The Heart Foundation's major concern with many VLCARB [Very Low Carb] diets is not their restriction of carbohydrate or increase in protein, but their high and unrestricted saturated fat content, which may contribute to cardiovascular risk.
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- Allen, Frederick M; Fitz, Reginald; Stillman, Edgar (1919). Total dietary regulation in the treatment of diabetes. New York: The Rockefeller Institute for Medical Research.
- Another publication of similar regimen was Hill, Lewis Webb, M.D., & Eckman, Rena S., The Starvation Treatment of Diabetes with a series of graduated diets as used at the Massachusetts General Hospital (1915, Boston) 72 pageshttps://archive.org/details/starvationtreatm00hilliala . This was so well received that it went into revised editions, eventually becoming The Allen (Starvation) Treatment of Diabetes with a series of graduated diets (4th ed., 1921, Boston) 140 pages https://babel.hathitrust.org/cgi/pt?id=hvd.hc368d;view=2up;seq=4.
- Also see "Discussion on the Modern Treatment of Diabetes (Oct. 24, 1921)" in Transactions of the Medical Society of London, vol. 45, (1923, London, printed for the Society) pages 3-16 https://babel.hathitrust.org/cgi/pt?id=umn.319510003249606;view=2up;seq=58
- 1967: the Stillman diet – History Of Diets, Part 12 – protein diet Men's Fitness. June 2003
- Air Force Diet. Toronto, Canada, Air Force Diet Publishers, 1960.
- Gardner Jameson and Elliot Williams (1964) The Drinking Man's Diet. San Francisco: Cameron. (2004) Revised Ed. ISBN 978-0-918684-65-3. See also Alan Farnham (2004) "The Drinking Man's Diet", Forbes.com.
- Lutz, Wolfgang; Allan, C.B. Life Without Bread. McGraw-Hill; 2000. ISBN 978-0-658-00170-3. English language, 1st Ed.
- Gordon, Edgar; Goldberg, Marshall; Chosy, Grace (October 1963). "A New Concept in the Treatment of Obesity". JAMA. 186 (1): 50–60. doi:10.1001/jama.1963.63710010013014. Retrieved 19 January 2015.
- A critique of low-carbohydrate ketogenic weight reduction regimens. A review of Dr. Atkins' diet revolution. Archived 26 October 2004 at the Wayback Machine., Journal of the American Medical Association, 1973
- Jenkins, DJ; Wolever, TM; Taylor, RH; Barker, H; Fielden, H; Baldwin, JM; Bowling, AC; Newman, HC; et al. (1981). "Glycemic index of foods: A physiological basis for carbohydrate exchange". The American Journal of Clinical Nutrition. 34 (3): 362–6. doi:10.1093/ajcn/34.3.362. PMID 6259925.
- "PBS News Hour: Low Carb Craze". Pbs.org. Retrieved 18 December 2011.
- Americans Look for Health on the Menu: Survey finds nutrition plays increasing role in dining-out choices "Archived copy". Archived from the original on 28 September 2007. Retrieved 28 September 2007.
- Morning Edition (22 June 2004). "Low-Carb Diets Trim Krispy Kreme's Profit Line". Npr.org. Retrieved 18 December 2011.
- The American Kidney Fund: American Kidney Fund Warns About Impact of High-Protein Diets on Kidney Health: 25 April 2002
- BBC (19 January 2004) Atkins diet boss: 'Eat less fat'. BBC News. Retrieved on 12 September 2007.
- Burros, Marian (21 January 2004). "Eating Well; The Post-Atkins Low Carb Diet". The New York Times. Retrieved 19 December 2010.