Lactose intolerance

lactose intolerantlactose-intolerantlactase deficiencylactose malabsorptionlactose tolerancelactose intolerance among the Chinese populationcannot digest the lactoselactose-free dietdairyselection for genetic traits for lactose digestion
Lactose intolerance is a condition in which people have symptoms due to the decreased ability to digest lactose, a sugar found in dairy products.wikipedia
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Diarrhea

diarrhoeadiarrheal diseaseschronic diarrhea
Symptoms may include abdominal pain, bloating, diarrhea, gas, and nausea. The principal symptom of lactose intolerance is an adverse reaction to products containing lactose (primarily milk), including abdominal bloating and cramps, flatulence, diarrhea, nausea, borborygmi, and vomiting (particularly in adolescents).
These include lactose intolerance, irritable bowel syndrome, non-celiac gluten sensitivity, celiac disease, inflammatory bowel disease, hyperthyroidism, bile acid diarrhea, and a number of medications.

Bloating

bloatedgasabdominal bloating
Symptoms may include abdominal pain, bloating, diarrhea, gas, and nausea. The principal symptom of lactose intolerance is an adverse reaction to products containing lactose (primarily milk), including abdominal bloating and cramps, flatulence, diarrhea, nausea, borborygmi, and vomiting (particularly in adolescents).
Lactose intolerance, fructose intolerance and other food intolerances

Lactase persistence

lactose toleranceproduction of lactase in adulthooddigest lactose into adulthood
The ability to digest lactose into adulthood evolved in several human populations independently, probably as an adaptation to the domestication of dairy animals 10,000 years ago.
The majority of people around the world remain lactase nonpersistent, and consequently are affected by varying degrees of lactose intolerance as adults.

Lactase

LCTlactase supplementsβ-galactosidase
Lactose intolerance is due to the lack of enzyme lactase in the small intestines to break lactose down into glucose and galactose.
Lacking lactase, a person consuming dairy products may experience the symptoms of lactose intolerance.

Hydrogen breath test

breath testinghydrogen gas in the breathglucose breath test
Other supporting tests include a hydrogen breath test and a stool acidity test.
A hydrogen breath test (or HBT) is used as a diagnostic tool for small intestine bacterial overgrowth and carbohydrate malabsorption, such as lactose, fructose, and sorbitol malabsorption.

Flatulence

fartflatusflatulent
Symptoms may include abdominal pain, bloating, diarrhea, gas, and nausea. The principal symptom of lactose intolerance is an adverse reaction to products containing lactose (primarily milk), including abdominal bloating and cramps, flatulence, diarrhea, nausea, borborygmi, and vomiting (particularly in adolescents).
In the case of people who have lactose intolerance, intestinal bacteria feeding on lactose can give rise to excessive gas production when milk or lactose-containing substances have been consumed.

Abdominal pain

stomach achestomachachestomach pain
Symptoms may include abdominal pain, bloating, diarrhea, gas, and nausea.
Digestive: peptic ulcer, lactose intolerance, celiac disease, food allergies

Ulcerative colitis

colitis ulcerosainflammatory colitiscolitis
It may be caused by acute gastroenteritis, coeliac disease, Crohn's disease, ulcerative colitis, chemotherapy, intestinal parasites (such as giardia), or other environmental causes.
Dietary changes, such as maintaining a high-calorie diet or lactose-free diet, may improve symptoms.

Coeliac disease

celiac diseasecoeliacceliac sprue
It may be caused by acute gastroenteritis, coeliac disease, Crohn's disease, ulcerative colitis, chemotherapy, intestinal parasites (such as giardia), or other environmental causes. Secondary lactose intolerance is due to injury to the small intestine such as from infection, celiac disease, inflammatory bowel disease, or other diseases. Other conditions that may produce similar symptoms include irritable bowel syndrome, celiac disease, and inflammatory bowel disease.
As the bowel becomes more damaged, a degree of lactose intolerance may develop.

Fecal pH test

stool acidity test
Other supporting tests include a hydrogen breath test and a stool acidity test.
An acidic stool can indicate a digestive problem such as lactose intolerance or a contagion such as E. coli or rotavirus, or overgrowth of the acid producing bacteria (such as lactic acid bacteria for instance).

Irritable bowel syndrome

IBSirritable bowelbowel
Other conditions that may produce similar symptoms include irritable bowel syndrome, celiac disease, and inflammatory bowel disease.
These include gastrointestinal infections, lactose intolerance, and coeliac disease.

Soy milk

soymilksoya milksoybean milk
Plant-based "milks" and derivatives such as soy milk, rice milk, almond milk, coconut milk, hazelnut milk, oat milk, hemp milk, macadamia nut milk, and peanut milk are inherently lactose-free.
Along with similar vegetable-based "milks", like almond and rice milk, soy milk may be used as a substitute for dairy milk by individuals who are vegan or lactose intolerant.

Milk allergy

milk allergiesmilkdairy
Milk allergy, occurring in only 4% of the population, is a separate condition, with distinct symptoms that occur when the presence of milk proteins trigger an immune reaction.
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.

Almond milk

almondalmond-milk of almonds
Plant-based "milks" and derivatives such as soy milk, rice milk, almond milk, coconut milk, hazelnut milk, oat milk, hemp milk, macadamia nut milk, and peanut milk are inherently lactose-free.
It contains neither cholesterol nor lactose, and is often consumed by those who are lactose-intolerant and others who wish to avoid dairy products, including vegans.

Vomiting

emeticvomitemesis
The principal symptom of lactose intolerance is an adverse reaction to products containing lactose (primarily milk), including abdominal bloating and cramps, flatulence, diarrhea, nausea, borborygmi, and vomiting (particularly in adolescents).
In children, it can be caused by an allergic reaction to cow's milk proteins (Milk allergy or lactose intolerance)

Gut flora

gut microbiotaintestinal floragut bacteria
Bacteria in the colon can metabolise lactose, and the resulting fermentation produces copious amounts of gas (a mixture of hydrogen, carbon dioxide, and methane) that causes the various abdominal symptoms.
Carbohydrates that humans cannot digest without bacterial help include certain starches, fiber, oligosaccharides, and sugars that the body failed to digest and absorb like lactose in the case of lactose intolerance and sugar alcohols, mucus produced by the gut, and proteins.

Plant milk

oat milkgrain milkPlant-based "milks
Plant-based "milks" and derivatives such as soy milk, rice milk, almond milk, coconut milk, hazelnut milk, oat milk, hemp milk, macadamia nut milk, and peanut milk are inherently lactose-free.
There are several reasons for consuming plant milk: tradition; availability; taste preference; health reasons including such conditions as lactose intolerance, milk allergy and phenylketonuria; ethical reasons such as animal welfare; environmental reasons; dietary reasons such as veganism and ovo-vegetarianism; and religious reasons including some Christian Lent observances.

Food allergy

food allergiesfood allergensallergy
Lactose intolerance is not an allergy, because it is not an immune response, but rather a sensitivity to dairy caused by lactase deficiency.
Lactose intolerance generally develops later in life, but can present in young patients in severe cases. It is due to an enzyme deficiency (lactase) and not allergy, and occurs in many non-Western people.

Enzyme

enzymologyenzymesenzymatic
Lactose intolerance is due to the lack of enzyme lactase in the small intestines to break lactose down into glucose and galactose.
Oral administration of enzymes can be used to treat some functional enzyme deficiencies, such as pancreatic insufficiency and lactose intolerance.

Dairy product

dairy productsdairydairy foods
Lactose intolerance is a condition in which people have symptoms due to the decreased ability to digest lactose, a sugar found in dairy products.
Dairy products can cause problems for individuals who have lactose intolerance or a milk allergy.

Gluten-free diet

gluten-freegluten freegluten free diet
In people with coeliac disease, lactose intolerance normally reverts or improves several months after starting a gluten-free diet, but temporary dietary restriction of lactose may be needed.
Approximately, 35% of people with NCGS suffer other food intolerances, mainly lactose intolerance.

Peanut milk

Peanuts
Plant-based "milks" and derivatives such as soy milk, rice milk, almond milk, coconut milk, hazelnut milk, oat milk, hemp milk, macadamia nut milk, and peanut milk are inherently lactose-free.
It does not contain any lactose and is therefore suitable for people with lactose intolerance.

Clarified butter

clarifiedbutter oilbutteroil
Butter – the process of making butter largely removes lactose, but it is still present in small quantities; clarified butter contains a negligible amount of lactose.
It has negligible amounts of lactose and casein and is, therefore, acceptable to most who have a lactose intolerance or milk allergy.

Lactose

milk sugarmilk sugarssugars
Lactose intolerance is a condition in which people have symptoms due to the decreased ability to digest lactose, a sugar found in dairy products.
Lactose intolerance

Beta-galactosidase

β-galactosidasebeta galactosidaseβ-galactosidase
The enzyme, β-galactosidase, is available in tablet form in a variety of doses, in many countries without a prescription.
It is also important for the lactose intolerant community as it is responsible for making lactose-free milk and other dairy products.