Diarrhea and lactose intolerance

What is acute diarrhoea?

Acute diarrhoea is the sudden emission of too frequent stools for less than 7 days (more than 3 times a day), too abundant and of abnormal consistency (liquid or very soft stools). 

It is a frequent reason for consultation at the medical emergency wards, present mainly in infants and childrenIn addition to the above, adults frequently experience this symptom in cases of mass food poisoning and some cases of food intolerance.

Acute diarrhoea can be infectious in origin (gastroenteritis), inflammatory (Crohn's disease) or allergic (peanut allergy, egg protein allergy...).

Lactose intolerance

Episodes of acute diarrhoea are also seen in people with food intolerance, such as intolerance to lactose (milk sugar) which is linked to a lactase enzyme deficiencyThe absence of the latter prevents the breakdown of lactose into simple sugars (glucose and galactose) and causes fermentation in the digestive tract.

Lactose intolerance is abdominal syndrome marked by the appearance of stomach acheIn some cases, it can lead to vomiting, especially in children, 30 minutes to 2 hours after ingesting dairy products, due to their high lactose content.

Acute diarrhoea can become chronic, especially in people who do not have intense symptoms, they often neglect this symptom especially if the episodes of diarrhoea are distant. Diarrhoea in lactose intolerance is fluid diarrhoeaThis is an acidic and often violent meteorism (called meteorism), without the release of blood, triggered after taking dairy products or processed foods containing  lactose, the frequency of diarrhoea depends on the amount of lactose ingested and the degree of lactase deficiency. 

To combat diarrhoea caused by lactose intolerance, a low-lactose diet should be followed and/or supplement with lactase enzyme as proposed by Lactolerance.


The inability to digest lactose can be the cause of many symptoms, which vary from one individual to another depending on the degree of intolerance. Among these symptoms, some people may experience diarrhoea when they consume foods containing lactose. Diarrhoea is a symptom that should not be overlooked, particularly as it can have consequences for the health of people with lactose intolerance. So let's take a look at this symptom of lactose intolerance.


Why can lactose intolerance cause diarrhoea?


Let us remember that lactose intolerance is caused by a deficiency of the enzyme lactase in our body. It is lactase that, in principle, allows our body to properly digest lactose by breaking it down from a single complex sugar into two simple sugars. In most adults, the enzyme lactase is not present in our body enough to properly digest products containing lactose. We are therefore naturally lactose intolerant, but to different degrees from one individual to another. Everyone may experience varying symptoms ranging from borborygma to abdominal pain, flatulence or diarrhoea.


Diarrhoea is a symptom that is not always associated with lactose intolerance. Because episodes of diarrhoea may be distant, people with lactose intolerance do not always make the connection with the consumption of a food containing lactose. Furthermore, the frequency of diarrhoea episodes may vary depending on the amount of lactose ingested and the degree of intolerance.


In case of frequent diarrhoea, various tests can be carried out to confirm or rule out lactose intolerance. This symptom should not be taken lightly, as diarrhoea can be infectious, inflammatory (Crohn's disease) or allergic (after eating peanuts or eggs for example).


What can be done about symptoms of intolerance such as diarrhoea?


If you are lactose intolerant and suffer from regular diarrhoea, start by keeping a close eye on your diet. Limit foods containing lactose or, if you wish to continue consuming lactose, opt for lactase enzyme supplementation. In case of lactose intolerance, lactase can be taken in capsule or tablet form. Thanks to the absorption of lactase, the body will assimilate lactose better: you will thus benefit from better digestive comfort and will be relieved of all the intestinal discomforts from which you suffered without supplementation.


Lactase in capsule or tablet form has been known for around thirty years. It is an enzyme that is very well tolerated by the body and causes no undesirable effects. At Lactolérance, we offer several types of supplementation. Lactolerance 1Day has been developed to cater for all levels of intolerance and a single daily intake is sufficient to permanently improve intestinal comfort. Our capsules are also suitable for people with moderate (4500) or severe (9000) intolerance: these formats offer one-hour protection. All you have to do is adapt your intake according to the type of food you wish to consume and your degree of intolerance.

Image redirecting to the lactorélance 1day pack and 9000 pill dispenser product sheet

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