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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

bloatedabdominal bloatinggas
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

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

Lactase persistence

lactose tolerancedigest lactasedigest lactose
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 testingglucose breath testhydrogen
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.

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

IBSbowelirritable bowel
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.

Coeliac disease

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

Ulcerative colitis

Colitiscolitis ulcerosainflammatory colitis
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.

Milk allergy

milk allergiesmilkallergic
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.

Dairy product

dairy productsdairymilk products
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.

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.

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)

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

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.

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.

Soy milk

soymilksoya milkSoy Beverage
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.

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.

Almond milk

almondalmond-Badam 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.
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.

Oat 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.
Regardless, oat milk is often consumed to replace dairy milk in vegan diets, or in the cases of medical conditions where dairy is incompatible, such as lactose intolerance or a cow's milk allergy (CMA).

Clarified butter

butter oilclarifiedAnhydrous milk fat
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.

Finland

🇫🇮FinnishFIN
About 40 cases have been reported worldwide, mainly limited to Finland.
It also has the highest per capita consumption of milk, at about 1 litre per day, even though 17% of the Finns are lactose intolerant.

Gastroenteritis

stomach flucholera morbusinfectious diarrhea
It may be caused by acute gastroenteritis, coeliac disease, Crohn's disease, ulcerative colitis, chemotherapy, intestinal parasites (such as giardia), or other environmental causes.