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F-plan


The F-plan is a high fibre diet designed to induce healthy weight loss, created in the 1980s by British author Audrey Eyton, founder of Slimming Magazine, and based on the work of Denis Burkitt. The F-Plan diet book was in the top ten best selling books in America in April and May 1983. The diet works by restricting the daily intake of calories to less than 1,500 whilst consuming well-above the recommended level of dietary fibre. The fibre has a number of beneficial effects, such as making the dieter feel "full" for much longer than normal, reducing the urge to overeat, and promoting a healthy digestive system.

The disadvantages include excessive flatulence in the first few weeks and having to eat food that is harder work to chew and swallow. Some people also express a dislike of the texture of such a high fibre diet. The dieter will need to consume more water than usual to prevent constipation.

Nevertheless, the diet is very effective when followed faithfully and remains a popular choice of diet, with genuine health benefits.

In 2006 Audrey Eyton published "F2", a revised version of the F-plan written in the light of subsequent medical discoveries, which claims to be faster and more effective and campaigns against low-carbohydrate diets, particularly the Atkins Diet.



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Fad diet


A fad diet or diet cult is a diet that makes promises of weight loss or other health advantages such as longer life without backing by solid science, and in many cases are characterized by highly restrictive or unusual food choices. Celebrity endorsements are frequently associated with fad diets, and the individuals who develop and promote these programs often profit handsomely.

A competitive market for "healthy diets" arose in the nineteenth century developed world, as migration and industrialization and commodification of food supplies began eroding adherence to traditional ethnocultural diets, and the health consequences of pleasure-based diets were becoming apparent. As Matt Fitzgerald describes it, "This modern cult of healthy eating is made up of innumerable sub-cults that are constantly vying for superiority. ...Like consumer products in commercial markets, each of these diets has a brand name and is advertised as being better than competing brands. The recruiting programs of the healthy-diet cults consist almost entirely of efforts to convince prospective followers that their diet is the One True Way to eat for maximum physical health.... The specific cult whose "science"-backed schtick a person finds most convincing usually depends on his or her identity biases."

These diets are generally restrictive, and are characterized by promises of fast weight loss or great physical health, and which are not grounded in sound science.

Such diets are often endorsed by celebrities or medical professionals who style themselves as "gurus" and profit from sales of branded products, books, and public speaking.

These diets attract people who want to lose weight quickly and easily and keep that weight off or who want to be healthy and find that belonging to a group of people defined by a strict way of eating helps them to avoid the many bad food choices available in the developed world.

Most people (as high as 98% in some descriptions) of people who diet using these diets in order to lose weight gain it back within 5 years; fad diets fail because many of them are not sustainable, and people revert to former eating habits when the diet fails.

Fad diets may be based completely on pseudoscience (e.g. "magical fat-burning" foods or notions of vitalism); most fad diets are marketed or described with exaggerated claims, not sustainable in sound science, about the benefits of eating a certain way or the harms of eating other ways.



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Fast Mimicking Diet


Valter D. Longo (born October 9, 1967) is an Italian-American biogerontologist and cell biologist known for his studies on the role of starvation and nutrient response genes on cellular protection aging and diseases and for proposing that longevity is regulated by similar genes and mechanisms in many eukaryotes. He is currently a professor at the USC Davis School of Gerontology with a joint appointment in the department of Biological Sciences as well as serving as the director of the USC Longevity Institute.

Originally from Genoa, Italy, Valter Longo attended the University of North Texas majoring in Biochemistry.

In 1992 he joined the laboratory of "calorie restriction" pioneer Roy Walford at UCLA where he studied calorie restriction and aging of the immune system. He completed his PhD work in Biochemistry studying antioxidant enzymes and anti-aging genes under Joan Valentine at UCLA in 1997 and his postdoctoral training in the neurobiology of Alzheimer's Disease under Caleb Finch at the University of Southern California. Since 1997 he has been a faculty member at the USC Davis School of Gerontology and Ethel Percy Andrus Gerontology Center.



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Fasting


Fasting is a willing abstinence or reduction from some or all food, drink, or both, for a period of time. An absolute fast (dry fasting) is normally defined as abstinence from all food and liquid for a defined period, usually a period of 24 hours, or a number of days. Water fasting allows drinking water but nothing else. Other fasts may be partially restrictive, limiting only particular foods or substances. A fast may also be intermittent in nature. Fasting practices may preclude intercourse and other activities as well as food.

In a physiological context, fasting may refer to the metabolic status of a person who has not eaten overnight, or to the metabolic state achieved after complete digestion and absorption of a meal. Several metabolic adjustments occur during fasting, and some diagnostic tests are used to determine a fasting state. For example, a person is assumed to be fasting after 8–12 hours from their last meal. Metabolic changes toward the fasting state begin after absorption of a meal (typically 3–5 hours after a meal); "post-absorptive state" is synonymous with this usage, in contrast to the postprandial state of ongoing digestion.

A diagnostic fast refers to prolonged fasting (from 8–72 hours depending on age) conducted under observation for investigation of a problem, usually hypoglycemia.

Fasting is also a part of many religious observances.

Fasting is often practiced prior to surgery or other procedures that require general anesthetics because of the risk of pulmonary aspiration of gastric contents after induction of anesthesia (i.e., vomiting and inhaling the vomit, causing life-threatening aspiration pneumonia). Additionally, certain medical tests, such as cholesterol testing (lipid panel) or certain blood glucose measurements require fasting for several hours so that a baseline can be established. In the case of a lipid panel, failure to fast for a full 12 hours (including vitamins) will guarantee an elevated triglyceride measurement.



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Feingold diet


The Feingold diet is an elimination diet initially devised by Benjamin Feingold, MD. (1899–1982) following research in the 1970s which appeared to link food additives with hyperactivity; by eliminating these additives and various foods the diet was supposed to alleviate the condition.

Popular in its day, the diet has since been referred to as an "outmoded treatment"; there is no good evidence that it is effective, and it is difficult for people to follow.

The diet was originally based on the elimination of salicylate, artificial food coloring, and artificial flavors; later on in the 1970s, the preservatives BHA, BHT, and (somewhat later) TBHQ were eliminated. Besides foods with the eliminated additives, aspirin- or additive-containing drugs and toiletries were to be avoided. Even today, parents are advised to limit their purchases of mouthwash, toothpaste, cough drops, perfume, and various other nonfood products to those published in the Feingold Association's annual Foodlist and Shopping Guide. Some versions of the diet prohibit only artificial food coloring and additives. According to the Royal College of Psychiatrists as of 2014 the diet prohibited a number of foods which contain salicylic acid including apples, cucumbers and tomatoes.

Feingold stressed that the diet must be followed strictly and for an entire lifetime, and that whole families – not just the subject being "treated" – must observe the diet's rules.

Although the diet had a certain popular appeal, a 1983 meta-analysis found research on it to be of poor quality, and that overall there was no good evidence that it was effective in fulfilling its claims.



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FitDay


imageFitDay

FitDay is an online diet journal or food diary.

FitDay began as a personal computer software application written by two Boston programming entrepreneurs, Jim and Russ Determan (brothers), in 2002. Subsequently, they launched an internet version of the software on the domain FitDay.com. Internet Brands acquired FitDay in 2008, though the original programmers continue to lead development of the site. The site operates in Internet Brands' Health category along with health-focused sites such as 3FatChicks, CancerForums.net, and HealthNews.org.

The purpose of the website and the software is to track calorie consumption, calorie burning, weight loss goals, and various aspects of physical fitness. By entering all food and beverage consumption into the site, users maintain a food diary that tracks variables such as calorie, fat, carbohydrate, mineral, and vitamin intake. The site contains an extensive nutritional values database, and also provides for the tracking physical activity. FitDay Dietitian service was launched in December 2012 contenting members journals to a registered dietitian.

FitDay also offers an affiliate program wherein one can generate revenue by posting links of Fitday's top selling diet and fitness software on his website. Every time someone clicks on one of the links and purchases FitDay, Fitday will pay the referral. The FitDay affiliate program is hosted with ShareASale.com, a leading affiliate management site.



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FODMAP


FODMAPs are short chain carbohydrates that are poorly absorbed in the small intestine. They include short chain oligo-saccharide polymers of fructose (fructans) and galactooligosaccharides (GOS, stachyose, raffinose), disaccharides (lactose), monosaccharides (fructose), and sugar alcohols (polyols), such as sorbitol, mannitol, xylitol and maltitol.

The term FODMAP is an acronym, derived from "Fermentable, Oligo-, Di-, Mono-saccharides And Polyols". Although FODMAPs are naturally present in food and the human diet, FODMAP restriction has been found to improve symptom control in people with irritable bowel syndrome (IBS) and other functional gastrointestinal disorders (FGID). Prior to the formation of the FODMAP concept, diet was seldom used as first line therapy for management of IBS and other FGID.

Over many years, there have been multiple observations that ingestion of certain short-chain carbohydrates, including lactose, fructose and sorbitol, fructans and galactooligosaccharides, induced IBS-like symptoms. These studies also showed that dietary restriction of short-chain carbohydrates was associated with symptom improvement in some people with IBS.

These short-chain carbohydrates (lactose, fructose and sorbitol, fructans and GOS) behave similarly in the intestine. Firstly, being small molecules and either poorly absorbed or not absorbed at all, they drag water into the intestine via osmosis. Secondly, these molecules are readily fermented by colonic bacteria, so upon malabsorption in the small intestine they enter the large intestine where they generate gases (hydrogen, carbon dioxide and methane). The dual actions of these carbohydrates cause an expansion in volume of intestinal contents, which stretches the intestinal wall and stimulates nerves in the gut. It is this 'stretching' that triggers the sensations of pain and discomfort that are commonly experienced by IBS sufferers.



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Food combining


Food combining (also known as trophology) is a term for a nutritional approach that advocates specific combinations of foods as central to good health and weight loss (such as not mixing carbohydrate-rich foods and protein-rich foods in the same meal).

It was originally promoted by Herbert M. Shelton in his book Food Combining Made Easy (1951).

The best-known food-combining diet is the Hay Diet; Hay lost 30 pounds in 3 months when he implemented his research. One randomized controlled trial of food combining has been performed, and found no evidence that food combining was any more effective than a "balanced" diet in promoting weight loss.



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Gluten-free diet


A gluten-free diet (GFD) is a diet that excludes gluten, a protein composite found in wheat, barley, rye, and all their species and hybrids (such as spelt,kamut, and triticale). The inclusion of oats in a gluten-free diet remains controversial. Avenin present in oats may also be toxic for coeliac people; its toxicity depends on the cultivar consumed. Furthermore, oats are frequently cross-contaminated with cereals containing gluten.

Gluten causes health problems for those with gluten-related disorders, including celiac disease (CD), non-celiac gluten sensitivity (NCGS), gluten ataxia, dermatitis herpetiformis (DH) and wheat allergy. In these patients, the gluten-free diet is demonstrated as an effective treatment. In addition, at least in some cases, the gluten-free diet may improve gastrointestinal and/or systemic symptoms in diseases like irritable bowel syndrome, rheumatoid arthritis, multiple sclerosis or HIV enteropathy, among others. Several studies show that about 79% of the people with coeliac disease have an incomplete recovery of the small bowel, despite a strict gluten-free diet. This is mainly caused by inadvertent ingestion of gluten. People with poor basic education and understanding of gluten-free diet often believe that they are strictly following the diet, but are making regular errors.



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Freeganism


Freeganism is a practice and ideology of limited participation in the conventional economy and minimal consumption of resources, particularly through recovering wasted goods like food. The word "freegan" is a coinage derived from "free" and "vegan". While vegans might avoid buying animal products as an act of protest against animal exploitation, freegans—at least in theory—avoid buying anything as an act of protest against the food system in general.

Freeganism is often presented as synonymous with "dumpster diving" for discarded food, although freegans are distinguished by their association with an anti-consumerist and anti-capitalist ideology and their engagement in a wider range of alternative living strategies, such as voluntary unemployment, squatting abandoned buildings, and "guerilla gardening" in unoccupied city parks.

Freegans' goal of reduced participation in capitalism and tactics of recovering wasted goods shares elements with the Diggers, an anarchist street theater group based in Haight-Ashbury in San Francisco in the 1960s that organized free housing and clinics and gave away rescued food. The word "freegan" itself was allegedly invented in 1994 by Keith McHenry, the co-founder of Food Not Bombs—an anarchist group that distributes free vegetarian meals as a protest against militarism and as a way of providing "solidarity not charity"—to refer to vegans who eat animal products if they find them in a dumpster. McHenry's account is consistent with other published accounts of freeganism that show the word as beginning to be used in the mid-1990s by participants in the antiglobalization and radical environmental movements.

The pamphlet "Why Freegan?"—written by former Against Me! drummer Warren Oakes in Gainesville, Florida in 1999—defines freeganism as "an anti-consumeristic ethic about eating" and goes on to describe practices including dumpster diving, plate scraping, wild foraging, gardening, theft, employee scams, and barter as alternatives to paying for food. The pamphlet also expanded the activities associated with "freeganism" with a long section on non-alimentary practices, including conserving water, pre-cycling, reusing goods, and using solar energy. More than just a set of behaviors, though, the pamphlet presents freeganism as having an overarching political goal: an "ultimate boycott" of "all the corporations, all the stores, all the pesticides, all the land and resources wasted, the capitalist system, the all-oppressive dollar, the wage slavery, the whole burrito" in favor of "liv[ing] a full satisfying life...while treading lightly on the earth." The first organized group of self-described "freegans" formed in 2003 as an offshoot of the Wetlands Preserve nightclub and associated Activism Center in New York City. According to the group freegan.info, "After years of trying to boycott products from unethical corporations responsible for human rights violations, environmental destruction, and animal abuse, many of us found that no matter what we bought we ended up supporting something deplorable. We came to realize that the problem isn’t just a few bad corporations but the entire system itself." From 2005, freegan.info organized regular events including sewing and bicycle workshops, wild food foraging expeditions, and "trash tours"—public dumpster dives open to the public and to media.



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