Milk allergy

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Milk allergy
Milk 001.JPG
A glass of milk
Specialty Allergology   OOjs UI icon edit-ltr-progressive.svg
Frequency0.6% [1]

Milk allergy is an adverse immune reaction to one or more proteins in cow's milk. When allergy symptoms occur, they can occur rapidly or have a gradual onset. The former may include anaphylaxis, a potentially life-threatening condition which requires treatment with epinephrine among other measures. The latter can take hours to days to appear, with symptoms including atopic dermatitis, inflammation of the esophagus, enteropathy involving the small intestine and proctocolitis involving the rectum and colon. [2]


In the United States, 90% of allergic responses to foods are caused by eight foods, with cow's milk being the most common. [3] Recognition that a small number of foods are responsible for the majority of food allergies has led to requirements to prominently list these common allergens, including dairy, on food labels. [4] [5] [6] [7] One function of the immune system is to defend against infections by recognizing foreign proteins, but it should not over-react to food proteins. Heating milk proteins can cause them to become denatured, meaning to lose their 3-dimensional configuration, and thus lose allergenicity; for this reason dairy-containing baked goods may be tolerated while fresh milk triggers an allergic reaction.

Management is by avoiding eating any dairy foods or foods that contain dairy ingredients. [8] In people with rapid reactions (IgE-mediated milk allergy), the dose capable of provoking an allergic response can be as low as a few milligrams, so recommendations are to avoid dairy strictly. [9] [10] The declaration of the presence of trace amounts of milk or dairy in foods is not mandatory in any country, with the exception of Brazil. [5] [11] [12]

Milk allergy affects between 2% and 3% of babies and young children. [8] [13] To reduce risk, recommendations are that babies should be exclusively breastfed for at least four months, preferably six months, before introducing cow's milk. If there is a family history of dairy allergy, then soy infant formula can be considered, but about 10 to 15% of babies allergic to cow's milk will also react to soy. [14] The majority of children outgrow milk allergy, but for about 0.4% the condition persists into adulthood. [15] Oral immunotherapy is being researched, but it is of unclear benefit. [16] [17]

Signs and symptoms

Food allergies can have rapid-onset (from minutes up to 2 hours), delayed-onset (up to 48 hours or even 1 week), or combinations of both, depending on the mechanisms involved. The difference depends on the types of white blood cells involved. B cells, a subset of white blood cells, rapidly synthesize and secrete immunoglobulin E (IgE), a class of antibody which bind to antigens, i.e., the foreign proteins. Thus, immediate reactions are described as IgE-mediated. The delayed reactions involve non-IgE-mediated immune mechanisms initiated by B cells, T cells, and other white blood cells. Unlike with IgE reactions, there are no specific biomarker molecules circulating in the blood, and so, confirmation is by removing the suspect food from the diet and see if the symptoms resolve. [18]

IgE-mediated symptoms include: rash, hives, itching of the mouth, lips, tongue, throat, eyes, skin, or other areas, swelling of the lips, tongue, eyelids, or the whole face, difficulty swallowing, runny or congested nose, hoarse voice, wheezing, shortness of breath, diarrhea, abdominal pain, lightheadedness, fainting, nausea and vomiting. Symptoms of allergies vary from person to person and may also vary from incident to incident. [19] Serious danger regarding allergies can begin when the respiratory tract or blood circulation is affected. The former can be indicated by wheezing, a blocked airway and cyanosis, the latter by weak pulse, pale skin, and fainting. When these symptoms occur, the allergic reaction is called anaphylaxis. [19] Anaphylaxis occurs when IgE antibodies are involved, and areas of the body that are not in direct contact with the food become affected and show severe symptoms. [19] [20] Untreated, this can proceed to vasodilation, a low blood pressure situation called anaphylactic shock, and very rarely, death. [6] [20]

For milk allergy, non-IgE-mediated responses are more common than IgE-mediated. [21] The presence of certain symptoms, such as angioedema or atopic eczema, is more likely related to IgE-mediated allergies, whereas non-IgE-mediated reactions manifest as gastrointestinal symptoms, without skin or respiratory symptoms. [18] [22] Within non-IgE cow's milk allergy, clinicians distinguish among food protein-induced enterocolitis syndrome (FPIES), food protein-induced allergic proctocolitis (FPIAP) and food protein-induced enteropathy (FPE). Common trigger foods for all are cow's milk and soy foods (including soy infant formula). [22] [23] FPIAP is considered to be at the milder end of the spectrum and is characterized by intermittent bloody stools. FPE is identified by chronic diarrhea which will resolve when the offending food is removed from the infant's diet. FPIES can be severe, characterized by persistent vomiting, 1 to 4 hours after an allergen-containing food is ingested, to the point of lethargy. Watery and sometimes bloody diarrhea can develop 5 to 10 hours after the triggering meal, to the point of dehydration and low blood pressure. Infants reacting to cow's milk may also react to soy formula, and vice versa. [23] [24] International consensus guidelines have been established for the diagnosis and treatment of FPIES. [24]


Conditions caused by food allergies are classified into three groups according to the mechanism of the allergic response: [25]

  1. IgE-mediated (classic) – the most common type, manifesting as acute changes that occur shortly after eating, and may progress to anaphylaxis
  2. Non-IgE mediated – characterized by an immune response not involving IgE; may occur hours to days after eating, complicating the diagnosis
  3. IgE- and non-IgE-mediated – a hybrid of the above two types

Allergic reactions are hyperactive responses of the immune system to generally innocuous substances, such as proteins in the foods we eat. Some proteins trigger allergic reactions while others do not. One theory is resistance to digestion, the thinking being that when largely intact proteins reach the small intestine the white blood cells involved in immune reactions will be activated. [26] The heat of cooking structurally degrades protein molecules, potentially making them less allergenic. [27] Allergic responses can be divided into two phases: an acute response that occurs immediately after exposure to an allergen, which can then either subside or progress into a "late-phase reaction," prolonging the symptoms of a response and resulting in more tissue damage. [28] [29]

In the early stages of acute allergic reaction, lymphocytes previously sensitized to a specific protein or protein fraction react by quickly producing a particular type of antibody known as secreted IgE (sIgE), which circulates in the blood and binds to IgE-specific receptors on the surface of other kinds of immune cells called mast cells and basophils. Both of these are involved in the acute inflammatory response. [28] Activated mast cells and basophils undergo a process called degranulation, during which they release histamine and other inflammatory chemical mediators (cytokines, interleukins, leukotrienes, and prostaglandins) into the surrounding tissue causing several systemic effects, such as vasodilation, mucous secretion, nerve stimulation, and smooth muscle contraction. This results in runny nose, itchiness, shortness of breath, and potentially anaphylaxis. Depending on the individual, the allergen, and the mode of introduction, the symptoms can be system-wide (classical anaphylaxis), or localized to particular body systems; asthma is localized to the respiratory system, while eczema is localized to the skin. [28]

After the chemical mediators of the acute response subside, late-phase responses can often occur due to the migration of other white blood cells such as neutrophils, lymphocytes, eosinophils, and macrophages to the initial reaction sites. This is usually seen 2–24 hours after the original reaction. [29] Cytokines from mast cells may also play a role in the persistence of long-term effects. Late-phase responses seen in asthma are slightly different from those seen in other allergic responses, although they are still caused by release of mediators from eosinophils. [30]

Six major allergenic proteins from cow's milk have been identified: αs1-, αs2-, β-, and κ-casein from casein proteins and α-lactalbumin and β-lactoglobulin from whey proteins. There is some cross-reactivity with soy protein, particularly in non-IgE mediated allergy. Heat can reduce allergenic potential, so dairy ingredients in baked goods may be less likely to trigger a reaction than milk or cheese.[ citation needed ] For milk allergy, non-IgE-mediated responses are more common than IgE-mediated. The former can manifest as atopic dermatitis and gastrointestinal symptoms, especially in infants and young children. Some will display both, so that a child could react to an oral food challenge with respiratory symptoms and hives (skin rash), followed a day or two later with a flare up of atopic dermatitis and gastrointestinal symptoms, including chronic diarrhea, blood in the stools, gastroesophageal reflux disease (GERD), constipation, chronic vomiting and colic. [2]


Skin prick testing for allergies. For a positive response, the skin will become red and raised. Skin prick testing for allergies.jpg
Skin prick testing for allergies. For a positive response, the skin will become red and raised.

Diagnosis of milk allergy is based on the person's history of allergic reactions, skin prick test (SPT), patch test, and measurement of milk protein specific serum IgE. A negative IgE test does not rule out non-IgE-mediated allergy, also described as cell-mediated allergy. Confirmation is by double-blind, placebo-controlled food challenges, conducted by an allergy specialist. SPT and IgE have a sensitivity of around 88% but specificity of 68% and 48%, respectively, meaning these tests will probably detect a milk sensitivity but may also be false-positive for other allergens. [31]

Attempts have been made to identify SPT and IgE responses accurate enough to avoid the need for confirmation with an oral food challenge. A systematic review stated that in children younger than two years, cut-offs for specific IgE or SPT seem to be more homogeneous and may be proposed. For older children, the tests were less consistent. It concluded "None of the cut-offs proposed in the literature can be used to definitely confirm cow's milk allergy diagnosis, either to fresh pasteurized or to baked milk." [32]

Differential diagnosis

The symptoms of milk allergy can be confused with other disorders that present similar clinical features, such as lactose intolerance, infectious gastroenteritis, celiac disease, non-celiac gluten sensitivity, inflammatory bowel disease, eosinophilic gastroenteritis, and pancreatic insufficiency, among others. [33] [34] [35]

Lactose intolerance

Hydrolysis of the disaccharide lactose to glucose and galactose Hydrolysis of lactose.svg
Hydrolysis of the disaccharide lactose to glucose and galactose

Milk allergy is distinct from lactose intolerance, which is a nonallergic food sensitivity, due to the lack of the enzyme lactase in the small intestines to break lactose down into glucose and galactose. The unabsorbed lactose reaches the large intestine, where resident bacteria use it for fuel, releasing hydrogen, carbon dioxide and methane gases. These gases are the cause of abdominal pain and other symptoms. [33] [36] Lactose intolerance does not cause damage to the gastrointestinal tract. [37] There are four types: primary, secondary, developmental, and congenital. [38] Primary lactose intolerance is when the amount of lactase declines as people age. [38] Secondary lactose intolerance is due to injury to the small intestine, such as from infection, celiac disease, inflammatory bowel disease, or other diseases. [38] [39] Developmental lactose intolerance may occur in premature babies and usually improves over a short period of time. [38] Congenital lactose intolerance is an extremely rare genetic disorder in which little or no lactase is made from birth. [38]


Research on prevention addresses the question of whether it is possible to reduce the risk of developing an allergy in the first place. Reviews concluded that there is no strong evidence to recommend changes to the diets of pregnant or nursing women as a means of preventing the development of food allergy in their infants. [40] [41] [42] For mothers of infants considered at high risk of developing cow's milk allergy because of a family history, there is some evidence that the nursing mother avoiding allergens may reduce risk of the child developing eczema, but a Cochrane review concluded that more research is needed. [41]

Guidelines from various government and international organizations recommend that for the lowest allergy risk, infants be exclusively breastfed for 4–6 months. There does not appear to be any benefit to extending that period beyond six months. [42] [43] If a nursing mother decides to start feeding with an infant formula prior to four months the recommendation is to use a formula containing cow's milk proteins. [44]

A different consideration occurs when there is a family history – either parents or older siblings – of milk allergy. The three options to avoiding formula with intact cow's milk proteins are substituting a product containing either extensively hydrolyzed milk proteins, or a non-dairy formula, or one utilizing free amino acids. The hydrolyzation process breaks intact proteins into fragments, in theory reducing allergenic potential. In 2016, the U.S. Food and Drug Administration (FDA) approved a label claim for hydrolyzed whey protein being hypoallergenic. [45] However, a meta-analysis published the same year disputed this claim, concluding that, based on dozens of clinical trials, there was insufficient evidence to support a claim that a partially hydrolyzed formula could reduce the risk of eczema. [46] Soy formula is a common substitution, but infants with milk allergy may also have an allergic response to soy formula. [47] Hydrolyzed rice formula is an option, as are the more expensive amino acid-based formulas. [44]


The need for a dairy-free diet should be reevaluated every six months by testing milk-containing products low on the "milk ladder", such as fully cooked, i.e., baked foods, containing milk, in which the milk proteins have been denatured, and ending with fresh cheese and milk. [8] [48] Desensitization via oral immunotherapy is considered experimental. [49]

Treatment for accidental ingestion of milk products by allergic individuals varies depending on the sensitivity of the person. An antihistamine, such as diphenhydramine (Benadryl), may be prescribed. Sometimes prednisone will be prescribed to prevent a possible late-phase type I hypersensitivity reaction. [50] Severe allergic reactions (anaphylaxis) may require treatment with an epinephrine pen, i.e., an injection device designed to be used by a non-healthcare professional when emergency treatment is warranted. A second dose is needed in 16–35% of episodes. [51]

Avoiding dairy

Most people find it necessary to strictly avoid any item containing dairy ingredients. [9] The reason is that the individual threshold dose capable of provoking an allergic reaction can be quite small, especially in infants. An estimated 5% react to less than 30 milligrams of dairy proteins, and 1% react to less than 1 milligram. [52] A more recent review calculated that the eliciting threshold dose for an allergic reaction in 1% of people (ED01) with confirmed cow's milk allergy is 0.1 mg of cow's milk protein. [53]

Beyond the obvious (anything with milk, cheese, cream, curd, butter, ghee or yogurt in the name), in countries where allergen labeling is mandatory, the ingredient list is supposed to list all ingredients. Anyone with or caring for a person with a dairy protein allergy should always carefully read food package labels, as sometimes even a familiar brand undergoes an ingredient change. [54] In the U.S., for all foods except meat, poultry and egg processed products and most alcoholic beverages, if an ingredient is derived from one of the required-label allergens, then it must either have the food name in parentheses, for example "Casein (milk)," or as an alternative, there must be a statement separate but adjacent to the ingredients list: "Contains milk" (and any other of the allergens with mandatory labeling). [5] [54] [55] [56] Dairy-sourced protein ingredients include casein, caseinates, whey and lactalbumin, among others. [54] [57] The U.S. FDA has a recall process for foods that contain undeclared allergenic ingredients. [58] The University of Wisconsin has a list of foods that may contain dairy proteins, yet are not always obvious from the name or type of food. [57] This list contains the following examples:

There is a distinction between “Contains ___” and “May contain ___.” The first is a deliberate addition to the ingredients of a food, and is required. The second addresses unintentional possible inclusion of ingredients, in this instance dairy-sourced, during transportation, storage or at the manufacturing site, and is voluntary, and is referred to as precautionary allergen labeling (PAL). [5] [54] [11]

Milk from other mammalian species (goat, sheep, etc.) should not be used as a substitute for cow's milk, as milk proteins from other mammals are often cross-reactive. [59] Nevertheless, some people with cow's milk allergy can tolerate goat's or sheep's milk, and vice versa. Milk from camels, pigs, reindeer, horses, and donkeys may also be tolerated in some cases. [47] Probiotic products have been tested, and some found to contain milk proteins which were not always indicated on the labels. [60] [61]

Cross-reactivity with soy

Infants – either still 100% breastfeeding or on infant formula – and also young children may be prone to a combined cow's milk and soy protein allergy, referred to as "milk soy protein intolerance" (MSPI). A U.S. state government website presents the concept, including a recommendation that nursing mothers discontinue eating any foods that contain dairy or soy ingredients. [62] In opposition to this recommendation, a published scientific review stated that there was not yet sufficient evidence in the human trial literature to conclude that maternal dietary food avoidance during lactation would prevent or treat allergic symptoms in breastfed infants. [41]

A review presented information on milk allergy, soy allergy and cross-reactivity between the two. Milk allergy was described as occurring in 2.2% to 2.8% of infants and declining with age. Soy allergy was described as occurring in zero to 0.7% of young children. According to several studies cited in the review, between 10% and 14% of infants and young children with confirmed cow's milk allergy were determined to also be sensitized to soy and in some instances have a clinical reaction after consuming a soy-containing food. The research did not address whether the cause was two separate allergies or a cross-reaction due to a similarity in protein structure, as which occurs for cow's milk and goat's milk. [47] Recommendations are that infants diagnosed as allergic to cow's milk infant formula be switched to an extensively hydrolyzed protein formula rather than a soy whole protein formula. [47] [63]


Milk allergy typically presents in the first year of life. The majority of children outgrow milk allergy by the age of ten years. [8] [13] One large clinical trial reported resolutions of 19% by age 4 years, 42% by age 8 years, 64% by age 12 years, and 79% by 16 years. [64] Children are often better able to tolerate milk as an ingredient in baked goods relative to liquid milk. Childhood predictors for adult-persistence are anaphylaxis, high milk-specific serum IgE, robust response to the skin prick test and absence of tolerance to milk-containing baked foods. [13] Resolution was more likely if baseline serum IgE was lower, [64] or if IgE-mediated allergy was absent so that all that was present was cell-mediated, non-IgE allergy. [8] People with confirmed cow's milk allergy may also demonstrate an allergic response to beef, more so to rare beef versus well-cooked beef. The offending protein appears to be bovine serum albumin. [65]

Milk allergy has consequences. In a U.S. government diet and health surveys conducted in 2007–2010, 6,189 children ages 2–17 years were assessed. For those classified as cow's milk allergic at the time of the survey, mean weight, height, and body-mass index were significantly lower than their non-allergic peers. This was not true for children with other food allergies. Diet assessment showed a significant 23% reduction of calcium intake and near-significant trends for lower vitamin D and total calorie intake. [66]


Incidence and prevalence are terms commonly used in describing disease epidemiology. Incidence is newly diagnosed cases, which can be expressed as new cases per year per million people. Prevalence is the number of cases alive, expressible as existing cases per million people during a period of time. [67] The percentage of babies in developed countries with milk allergy is between 2% and 3%. This estimate is for antibody-based allergy; figures for allergy based on cellular immunity are unknown. [8] The percentage declines as children get older. National survey data in the U.S. collected from 2005–2006 showed that from age six and older, the percentage with IgE-confirmed milk allergy was under 0.4%. [15] For all age groups, a review conducted in Europe estimated 0.6% had milk allergy. [1]

Society and culture

Dairy allergy was one of the earliest food allergies to be recorded. An ancient Greek medical text attributed to the doctor Hippocrates (c. 460 – c. 370 BC) notes in the context of a description of how some foods are harmful to certain individuals but not others, "...cheese does not harm all men alike; some can eat their fill of it without the slightest hurt, nay, those it agrees with are wonderfully strengthened thereby. Others come off badly." The text attempts to explain the reaction to the cheese in terms of Hippocratic humorism, stating that some constitutions are naturally "hostile to cheese, and [are] roused and stirred to action under its influence." [68]

With the passage of mandatory labeling laws, food allergy awareness has definitely increased, with impacts on the quality of life for children, their parents and their immediate caregivers. [69] [70] [71] [72] In the U.S., the Food Allergen Labeling and Consumer Protection Act of 2004 (FALPA) causes people to be reminded of allergy problems every time they handle a food package, and restaurants have added allergen warnings to menus. School systems have protocols about what foods can be brought into the school. Despite all these precautions, people with serious allergies are aware that accidental exposure can easily occur at other peoples' houses, at school or in restaurants. [73] Food fear has a significant impact on quality of life. [71] [72] Finally, for children with allergies, their quality of life is also affected by actions of their peers. There is an increased occurrence of bullying, which can include threats or acts of deliberately being touched with foods they need to avoid, also having their allergen-free food deliberately contaminated. [74]

Regulation of labeling

An example of "MAY CONTAIN TRACES OF..." as a means of listing trace amounts of allergens in a food product due to cross-contamination during manufacture. US Allergen Information Example.jpg
An example of "MAY CONTAIN TRACES OF..." as a means of listing trace amounts of allergens in a food product due to cross-contamination during manufacture.

In response to the risk that certain foods pose to those with food allergies, some countries have responded by instituting labeling laws that require food products to clearly inform consumers if their products contain major allergens or byproducts of major allergens among the ingredients intentionally added to foods. Nevertheless, there are no labeling laws to mandatory declare the presence of trace amounts in the final product as a consequence of cross-contamination, except in Brazil. [4] [5] [7] [11] [54] [55] [56] [12]

Ingredients intentionally added

In the U.S., the FALPA requires companies to disclose on the label whether a packaged food product contains a major food allergen added intentionally: cow's milk, peanuts, eggs, shellfish, fish, tree nuts, soy and wheat. [4] This list originated in 1999 from the World Health Organisation Codex Alimentarius Commission. [11] To meet FALCPA labeling requirements, if an ingredient is derived from one of the required-label allergens, then it must either have its "food sourced name" in parentheses, for example "Casein (milk)," or as an alternative, there must be a statement separate but adjacent to the ingredients list: "Contains milk" (and any other of the allergens with mandatory labeling). [4] [54] Dairy food listing is also mandatory in the European Union and more than a dozen other countries. [7] [11]

FALCPA applies to packaged foods regulated by the FDA, which does not include poultry, most meats, certain egg products, and most alcoholic beverages. [5] However, some meat, poultry, and egg processed products may contain allergenic ingredients, such as added milk proteins. These products are regulated by the Food Safety and Inspection Service (FSIS), which requires that any ingredient be declared in the labeling only by its common or usual name. Neither the identification of the source of a specific ingredient in a parenthetical statement nor the use of statements to alert for the presence of specific ingredients, like "Contains: milk", are mandatory according to FSIS. [55] [56]

In the U.S., there is no federal mandate to address the presence of allergens in drug products. FALCPA does not apply to medicines nor to cosmetics. [75] FALCPA also does not apply to food prepared in restaurants. [76] [4]

Trace amounts as a result of cross-contamination

The value of allergen labeling other than for intentional ingredients is controversial. This concerns labeling for ingredients present unintentionally as a consequence of cross-contact or cross-contamination at any point along the food chain (during raw material transportation, storage or handling, due to shared equipment for processing and packaging, etc.). [5] [11] Experts in this field propose that if allergen labeling is to be useful to consumers, and healthcare professionals who advise and treat those consumers, ideally there should be agreement on which foods require labeling, threshold quantities below which labeling may be of no purpose, and validation of allergen detection methods to test and potentially recall foods that were deliberately or inadvertently contaminated. [77] [78]

Labeling regulations have been modified to provide for mandatory labeling of ingredients plus voluntary labeling, termed precautionary allergen labeling (PAL), also known as "may contain" statements, for possible, inadvertent, trace amount, cross-contamination during production. [11] [79] PAL labeling can be confusing to consumers, especially as there can be many variations on the wording of the warning. [79] [80] As of 2014, PAL is regulated only in Switzerland, Japan, Argentina, and South Africa. Argentina decided to prohibit precautionary allergen labeling since 2010, and instead puts the onus on the manufacturer to control the manufacturing process and label only those allergenic ingredients known to be in the products. South Africa does not permit the use of PAL, except when manufacturers demonstrate the potential presence of allergen due to cross-contamination through a documented risk assessment despite adherence to Good Manufacturing Practice. [11] In Australia and New Zealand, there is a recommendation that PAL be replaced by guidance from VITAL 2.0 (Vital Incidental Trace Allergen Labelling). A review identified "the eliciting dose for an allergic reaction in 1% of the population" as 0.01 mg for cow's milk. This threshold reference dose (and similar results for egg, peanut and other proteins) will provide food manufacturers with guidance for developing precautionary labelling and give consumers a better idea of what might be accidentally in a food product beyond "may contain." [53] [81] VITAL 2.0 was developed by the Allergen Bureau, a food industry-sponsored, non-government organization. [82] The EU has initiated a process to create labeling regulations for unintentional contamination but it is not expected to be published before 2024. [83]

Lack of compliance with labeling regulations is also a problem. As an example, the FDA documented failure to list milk as an ingredient in dark chocolate bars. The FDA tested 94 dark chocolate bars for the presence of milk. Only six listed milk as an ingredient, but of the remaining 88, the FDA found that 51 of them actually did contain milk proteins. Many of those did have PAL wording such as "may contain dairy." Others claimed to be "dairy free" or "vegan" but still tested positive for cow's milk proteins. [84]

In Brazil, since April 2016, the declaration of the possibility of cross-contamination is mandatory when the product does not intentionally add any allergenic food or its derivatives, but the Good Manufacturing Practices and allergen control measures adopted are not sufficient to prevent the presence of accidental trace amounts. Milk of all species of mammalians is included among these allergenic foods. [12]


Desensitization, which is a slow process of consuming tiny amounts of the allergenic protein until the body is able to tolerate more significant exposure, results in reduced symptoms or even remission of the allergy in some people and is being explored for treatment of milk allergy. [85] This is called oral immunotherapy (OIT). Sublingual immunotherapy, in which the allergenic protein is held in the mouth under the tongue, has been approved for grass and ragweed allergies, but not yet for foods. [86] [87] Oral desensitization for cow's milk allergy appears to be relatively safe and may be effective, however further studies are required to understand the overall immune response, and questions remain open about duration of the desensitization. [8] [16] [17] [49]

There is research – not specific to milk allergy – on the use of probiotics, prebiotics and the combination of the two (synbiotics) as a means of treating or preventing infant and child allergies. From reviews, there appears to be a treatment benefit for eczema, [88] [89] [90] but not asthma, wheezing or rhinoconjunctivitis. [89] [91] Several reviews concluded that the evidence is sufficient for it to be recommended in clinical practice. [90] [92] [93]

See also

Related Research Articles

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Allergies, also known as allergic diseases, are a number of conditions caused by hypersensitivity of the immune system to typically harmless substances in the environment. These diseases include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis. Symptoms may include red eyes, an itchy rash, sneezing, a runny nose, shortness of breath, or swelling. Food intolerances and food poisoning are separate conditions.

Food allergy Hypersensitivity reaction to a food

A food allergy is an abnormal immune response to food. The symptoms of the allergic reaction may range from mild to severe. They may include itchiness, swelling of the tongue, vomiting, diarrhea, hives, trouble breathing, or low blood pressure. This typically occurs within minutes to several hours of exposure. When the symptoms are severe, it is known as anaphylaxis. A food intolerance and food poisoning are separate conditions, not due to an immune response.

Latex allergy Medical condition

Latex allergy is a medical term encompassing a range of allergic reactions to the proteins present in natural rubber latex. Latex allergy generally develops after repeated exposure to products containing natural rubber latex. When latex-containing medical devices or supplies come in contact with mucous membranes, the membranes may absorb latex proteins. The immune system of some susceptible individuals produces antibodies that react immunologically with these antigenic proteins. As many items contain or are made from natural rubber, including shoe soles, pen grips, hot water bottles, elastic bands, rubber gloves, condoms, baby-bottle nipples, and balloons, there are many possible routes of exposure that may trigger a reaction. People with latex allergies may also have or develop allergic reactions to some fruits, such as bananas.

Food intolerance is a detrimental reaction, often delayed, to a food, beverage, food additive, or compound found in foods that produces symptoms in one or more body organs and systems, but generally refers to reactions other than food allergy. Food hypersensitivity is used to refer broadly to both food intolerances and food allergies.

Allergen immunotherapy Medical treatment for environmental allergies

Allergen immunotherapy, also known as desensitization or hypo-sensitization, is a medical treatment for environmental allergies, such as insect bites, and asthma. Immunotherapy involves exposing people to larger and larger amounts of allergen in an attempt to change the immune system's response.

Milk substitute

A milk substitute is any substance that resembles milk and can be used in the same ways as milk. Such substances may be variously known as non-dairy beverage, nut milk, grain milk, legume milk and alternative milk.

Peanut allergy Type of food allergy caused by peanuts

Peanut allergy is a type of food allergy to peanuts. It is different from tree nut allergies, with peanuts being legumes and not true nuts. Physical symptoms of allergic reaction can include itchiness, hives, swelling, eczema, sneezing, asthma attack, abdominal pain, drop in blood pressure, diarrhea, and cardiac arrest. Anaphylaxis may occur. Those with a history of asthma are more likely to be severely affected.

Soy allergy Medical condition

Soy allergy is a type of food allergy. It is a hypersensitivity to ingesting compounds in soy, causing an overreaction of the immune system, typically with physical symptoms, such as gastrointestinal discomfort, respiratory distress, or a skin reaction. Soy is among the eight most common foods inducing allergic reactions in children and adults. It has a prevalence of about 0.3% in the general population.

Oral allergy syndrome (OAS) is a type of food allergy classified by a cluster of allergic reactions in the mouth and throat in response to eating certain fruits, nuts, and vegetables that typically develops in adults with hay fever.

Egg allergy Immune hypersensitivity to proteins found in eggs

Egg allergy is an immune hypersensitivity to proteins found in chicken eggs, and possibly goose, duck, or turkey eggs. Symptoms can be either rapid or gradual in onset. The latter can take hours to days to appear. The former may include anaphylaxis, a potentially life-threatening condition which requires treatment with epinephrine. Other presentations may include atopic dermatitis or inflammation of the esophagus.

Tree nut allergy Medical condition

A tree nut allergy is a hypersensitivity to dietary substances from tree nuts and edible tree seeds causing an overreaction of the immune system which may lead to severe physical symptoms. Tree nuts include, but are not limited to, almonds, Brazil nuts, cashews, chestnuts, filberts/hazelnuts, macadamia nuts, pecans, pistachios, shea nuts and walnuts.

Wheat allergy Medical condition

Wheat allergy is an allergy to wheat which typically presents itself as a food allergy, but can also be a contact allergy resulting from occupational exposure. Like all allergies, wheat allergy involves immunoglobulin E and mast cell response. Typically the allergy is limited to the seed storage proteins of wheat. Some reactions are restricted to wheat proteins, while others can react across many varieties of seeds and other plant tissues. Wheat allergy is rare. Prevalence in adults was found to be 0.21% in a 2012 study in Japan.

Corn allergy, also called maize allergy, is a very rare food allergy. People with a true IgE-mediated allergy to corn develop symptoms such as swelling or hives when they eat corn or foods that contain corn. The allergy can be difficult to manage due to many food and non-food products that contain various forms of corn, such as corn starch and modified food starch, among many others.

Food Protein-Induced Enterocolitis Syndrome (FPIES) is a systemic, non IgE-mediated response to a specific trigger within food - most likely food protein. FPIES presents in two different forms: an acute form and a chronic form. In its acute form, FPIES presents with vomiting that usually beings 1 to 4 hours after trigger food ingestion. Vomiting is often followed by a paleness to the skin, lethargy, and potentially watery, perhaps blood-tinged diarrhea. In the severe form of acute FPIES, a person will vomit until dehydration and until a shock-like state, which can occurs in 15% of patients. In its chronic form, which can be difficult to diagnose until a person has already met diagnostic criteria for acute FPIES, after repeated or regular ingestion of the trigger food, the person presents with chronic or episodic vomiting, failure to thrive, and watery, perhaps blood-tinged diarrhea. FPIES can potentially develop at any age but seems most commonly to develop within the first few years of life. FPIES has mainly been documented in young infants, but can exist in older children and adults. Some people develop both FPIES and an IgE-mediated type of reaction to the same food, and having FPIES can increase a person's risk of also developing IgE-mediated food allergies.

The Food Allergen Labeling and Consumer Protection Act (FALCPA) is a United States law that requires all food labels in the United States to list ingredients that may cause allergic reactions and was effective as of January 1, 2006. While many ingredients can trigger a food allergy, this legislation only specifies the eight major food allergens. This law was passed largely due to the efforts of organizations such as the Food Allergy & Anaphylaxis Network (FAAN).

Ara h1

Ara h 1 is a seed storage protein from Arachis hypogaea (peanuts). It is a heat stable 7S vicilin-like globulin with a stable trimeric form that comprises 12-16% of the total protein in peanut extracts. Ara h 1 is known because sensitization to it was found in 95% of peanut-allergic patients from North America. In spite of this high percentage, peanut-allergic patients of European populations have fewer sensitizations to Ara h 1.

Exercise-induced anaphylaxis is a rare condition in which anaphylaxis, a serious or life-threatening allergic response, is brought on by physical activity. Approximately 5–15% of all reported cases of anaphylaxis are thought to be exercise-induced.

Fish allergy Food allergy triggered by fish

Fish allergy is an immune hypersensitivity to proteins found in fish. Symptoms can be either rapid or gradual in onset. The latter can take hours to days to appear. The former may include anaphylaxis, a potentially life-threatening condition which requires treatment with epinephrine. Other presentations may include atopic dermatitis or inflammation of the esophagus. Fish is one of the eight common food allergens, responsible for 90% of allergic reactions to foods: cow's milk, eggs, wheat, shellfish, peanuts, tree nuts, fish, and soy beans.

Shellfish allergy Medical condition

Shellfish allergy is among the most common food allergies. "Shellfish" is a colloquial and fisheries term for aquatic invertebrates used as food, including various species of molluscs such as clams, mussels, oysters and scallops, crustaceans such as shrimp, lobsters and crabs, and cephalopods such as squid and octopus. Shellfish allergy is an immune hypersensitivity to proteins found in shellfish. Symptoms can be either rapid or gradual in onset. The latter can take hours to days to appear. The former may include anaphylaxis, a potentially life-threatening condition which requires treatment with epinephrine. Other presentations may include atopic dermatitis or inflammation of the esophagus. Shellfish is one of the eight common food allergens, responsible for 90% of allergic reactions to foods: cow's milk, eggs, wheat, shellfish, peanuts, tree nuts, fish, and soy beans.


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