Aflexitarian diet, also called asemi-vegetarian diet,[1] is one that is centered on plant-based foods with limited consumption ofmeat[2][3][4][5] and other animal products. People who follow a flexitarian diet often reduce their intake of red meats and poultry while increasing consumption of other plant based food groups such as fruits, vegetables, and grains. There are many different reasons people adopt flexitarian diets, including health, environmental, ethical, and economic reasons. Research has even started to make a point to a positive association with reduced risk of chronic illness and lower environmental impacts compared to diets high in red meats.[6] The term has gained greater publish recognization since the early 2000s and is used in both, scientific research and public research to describe a flexible way that people can limit their animal product and meat intake.
Different definitions of flexitarianism are used. According to the Dutch environmental organizationNatuur & Milieu a flexitarian eats no meat, fish or lunch meat for at least one day a week.[7] The Dutch research agencyI&O Research calls people flexitarian when they do not eat meat one or more days a week. The Dutch Food Health authorityVoedingscentrum states that flexitarians do not eat meat (but can eat fish) three or more days a week in between or with a hot meal.[8]
Vegetarianism is the strict practice of abstaining from consuming meat or any other animal tissue.Flexitarianism is a relatively new term that gained a considerable increase in usage in both science and public sectors in the 2010s.[1]Flexitarian was listed in the mainstreamMerriam-Webster's Collegiate Dictionary in 2012.[9] In 2003, theAmerican Dialect Society votedflexitarian as the year's most useful word.[10]
The term is also used more generally for any type of animal-product reduction without complete abstinence, such as abstaining from the meat of certain species while retaining that of others.[11] Otherneologisms used as synonyms for semi-vegetarianism aredemi-vegetarianism,[1]reducetarianism,[12][13] andsemi-veganism.[14]
Research and surveys point to the idea that meat reduction is becoming increasingly common in multiple countries, using flexitarianism to describe these patterns.[15] Research from 2015 and 2016 report that over half (55%) of Dutch people were flexitarians.[16] According to research byWageningen University & Research, the number of Dutch people who call themselves flexitarians increased from 14% in 2011 to 43% in 2019. However, the number of days that self-proclaimed flexitarians ate meat increased over that period from 2.9 days a week to 3.7 days. The researchers suspected that this was mainly due to the inflation of this term among the Dutch.[17] Estimates often vary across studies due to the different interpretations people have of flexitarianism.
Separate studies have also reported major declines in daily meat consumption from Dutch people between 2010 and 2012.[18] According to a study by Dutch research agencyMotivaction at the beginning of June 2012, reducing meat consumption is a conscious choice for 35% of the Dutch. 14.8% of the population ate meat no more than one or two days a week.[18]InFlanders, 1 in 6 people in 2013 do not eat meat one or more days a week.
A 2018 study estimated that the amount of UK consumers following a "meat-free diet" had increased to 12%, including 6% vegetarians, 4% pescetarians and 2% vegans.[19] A 2018 poll indicated that 10% of adult Canadians considered themselves as vegetarians or vegans, among whom 42% were young adults.[20]
The main fundamental of some specific flexitarian diets is about the inflexible adherence to a diet that omits multiple classes and types of animals from the diet in entirety, rather than a sole focus on reduction in consumption frequency. Some examples include:
Demitarianism: the practice of reducing meat consumption to half of what is culturally typical.[25] The term was devised in October 2009 in Barsac, France combined workshop of Nitrogen in Europe (NinE) and Biodiversity in European Grasslands: Impacts of Nitrogen (BEGIN) where they developed "The Barsac Declaration: Environmental Sustainability and the Demitarian Diet".[26]
Pescetarian diet: someone who follows this diet eatsfish and/orshellfish and may or may not consume dairy and eggs. The consumption of other meat, such as poultry, mammal meat, and the flesh of other land-dwelling animals is abstained from.[27] In the past, some vegetarian societies considered it to simply be a less-strict type of vegetarianism.[28] This is no longer the case now that modern day vegetarian societies object to the consumption of all fish and shellfish.
Pollotarian diet: someone who follows this diet eatschicken and/or otherpoultry and usually eggs as well. A pollotarian would not consumeseafood or the meat frommammals or other animals, often for environmental, health orfood justice reasons.[29][30]
Macrobiotic diet: a plant-based diet that may include occasional fish or other seafood.[31] Cereals, especially brown rice, are the staples of the macrobiotic diet, supplemented by small amounts of vegetables and occasionally fish. Some advocates of the macrobiotic diet promote a vegetarian (or nearly vegan) approach as the ideal.[32]
Planetary health diet: dietary paradigms with the following aims: to feed a growing world's population, to greatly reduce the worldwide number of deaths caused by poor diet, and to be environmentally sustainable as to prevent the collapse of the natural world.[33][34]
All semi-vegetarians could accurately be described as people who eat aplant-based diet, but there is no firm consensus how infrequently someone would have to eat meat and fish for their diet to be considered a flexitarian diet rather than a regular plant-based diet. Recurring conditions of a flexitarian include consuming red meat or poultry only once a week.[35][36] One study defined semi-vegetarians as consuming meat or fish three days a week.[37] Occasionally, researchers define semi-vegetarianism as eschewing red meat in entirety and flexitarianism as the distinct practice of eating very little meat.[38][39] Semi-vegetarianism/flexitarianism may be the default diet for much of the world, where meals based on plant materials provide the bulk of people's regular energy intake.[40] In many countries, this is often due to financial barriers as higher incomes are associated with diets rich in animal and dairy proteins rather than carbohydrate based staples. One estimate suggests that 14% of the global population is flexitarian.[41]
Flexitarianism has been discussed in public and media conversations about food choice and consumer behavior. This concept is often presented as a more flexible version of vegetarian or vegan diets, which may explain its frequent appearance in lifestyle discussions. In theUnited Kingdom, there was increased demand for vegan products in 2018, which explains this shift to a reduction of meat intake.[42]
Flexitarian dietary patterns have been analyzed and research has started to point to a relation to positive environmental impacts, especially compared to diets that are high in red meat. Studies have suggested that dietary patterns that involve reduced consumption of red meat, including flexitarian diets, are associated with lower greenhouse gas emissions compared to typical diets[Springmann 2018].[43] The environmental impact of diets high in red meat is mainly credited to the intensity of livestock production, which requires a large amount of land, food, and water. Compared with fully plant-based diets, flexitarian patterns result in smaller environmental benefits but, represent a much more achievable reduction strategy for many populations.
In 2019, researchers associated with the EAT-Lancet Commission argued that dietary patterns that reduced consumption of animal products, could support environmental sustainability while also meeting global nutritional needs when compared with typical Western diets[EAT-Lancet 2019]. However, many of this data is based on modeling analyses, and environmental outcomes could possibly vary depending on each flexitarians different diet.
^Malesu, Vijay Kumar (11 May 2025)."The Flexitarian Diet: A Flexible Path to Better Health".Medical News. Retrieved11 August 2025.For example, some individuals may exclude red meat but still consume poultry or fish, whereas others may consume all types of meat in limited amounts, such as once or twice a week.
^De Backer, Charlotte J. S.; Hudders, Liselot (2 November 2014). "From Meatless Mondays to Meatless Sundays: Motivations for Meat Reduction among Vegetarians and Semi-vegetarians Who Mildly or Significantly Reduce Their Meat Intake".Ecology of Food and Nutrition.53 (6):639–657.doi:10.1080/03670244.2014.896797.hdl:10067/1205320151162165141.PMID25357269.S2CID5449566.
^Hoek, Annet C.; Luning, Pieternel A.; Stafleu, Annette; de Graaf, Cees (June 2004). "Food-related lifestyle and health attitudes of Dutch vegetarians, non-vegetarian consumers of meat substitutes, and meat consumers".Appetite.42 (3):265–272.doi:10.1016/j.appet.2003.12.003.PMID15183917.S2CID24018607.
^Graham Hill (31 July 2000)."Pescatarian". Oxford. Archived fromthe original on 9 February 2018. Retrieved14 April 2019.
^"International Health Exhibition",The Medical Times and Gazette, 24 May 1884,712. "There are two kinds of vegetarians—one an extreme form, the members of which eat no animal food whatever; and a less extreme sect, who do not object to eggs, milk, or fish. The Vegetarian Society ... belongs to the latter more moderate division."
^Miller, ER (November 2006). "The effects of macronutrients on blood pressure and lipids: an overview of the DASH and OmniHeart trials".Curr Atheroscler Rep.8 (6):460–5.doi:10.1007/s11883-006-0020-1.PMID17045071.S2CID72616374.
^De Backer, Charlotte J. S.; Hudders, Liselot (2 November 2014). "From Meatless Mondays to Meatless Sundays: Motivations for Meat Reduction among Vegetarians and Semi-vegetarians Who Mildly or Significantly Reduce Their Meat Intake".Ecology of Food and Nutrition.53 (6):639–657.doi:10.1080/03670244.2014.896797.hdl:10067/1205320151162165141.PMID25357269.S2CID5449566.
