Lactose intolerance and irritable bowel syndrome: two different clinical conditions, similar symptoms.

When discussing gastrointestinal disorders, there are two clinical conditions that are often confused: lactose intolerance and irritable bowel syndrome (IBS).

Both conditions can cause bloating, abdominal pain, diarrhea, or constipation, and it is not uncommon for those suffering from them to wonder what the true cause of their symptoms is. In reality, these are two distinct disorders, which do not necessarily coexist, but are characterized by overlapping clinical manifestations, making diagnosis and daily management difficult.

Lactose intolerance: when milk sugar becomes a problem.

Lactose intolerance is a very widespread condition, characterized by the inability to properly digest lactose, the sugar present in milk and its derivatives. The cause is a deficiency of the enzyme lactase, which normally breaks down lactose into glucose and galactose, two easily absorbable simple sugars.

When lactase is insufficient, undigested lactose reaches the colon and is fermented by intestinal bacteria. This process produces gas and organic acids responsible for symptoms such as bloating, flatulence, abdominal cramps, and diarrhea.

Not all subjects suffering from lactose intolerance react in the same way: some tolerate small amounts of lactose, others manifest symptoms even with minimal doses.

Individual variability depends on genetic factors, the composition of the microbiota, and intestinal sensitivity.

Irritable bowel syndrome (IBS): a multifactorial disorder.

Irritable bowel syndrome is a chronic functional bowel disorder. Epidemiological studies show that in Western industrialized countries, the prevalence of IBS is generally estimated to be between 10 and 15% of the population.

The syndrome is characterized by recurrent abdominal pain, diarrhea, constipation or alternating symptoms, bloating, and abdominal distension.

Unlike lactose intolerance, IBS is multifactorial:

alterations in intestinal motility, visceral hypersensitivity, microbiota imbalances, psychological factors such as stress and anxiety, to list just a few of the identified causes.

Overlapping symptoms: the source of the confusion.

Many symptoms of lactose intolerance and IBS are similar and overlapping: bloating, gas formation, abdominal pain, and diarrhea. This often leads to confusing the two conditions and creates difficulties in receiving a clear and certain diagnosis.

In patients with IBS, intestinal sensitivity can amplify the symptoms of lactose intolerance; conversely, lactose belongs to the FODMAPs, i.e., fermentable carbohydrates that can worsen IBS symptoms.

However, not all patients with IBS are lactose intolerant.

Key differences between irritable bowel and lactose intolerance.

Identifying the triggering cause or causes is the key to reaching a correct diagnosis.

Lactose intolerance is caused by a lactase deficit that can be diagnosed through specific tests such as the lactose breath test, the lactose tolerance test (blood test), the fecal acidity test (in young children), etc., to reach an exclusion/reintroduction diet.

IBS is instead classified as a multifactorial functional disorder and consequently, as there are several factors that contribute together to the expression of symptoms, it can become more complex to diagnose.

The diagnosis of IBS is clinical, based on the Rome IV criteria and on the exclusion of other pathologies through targeted examinations. There is no single test that confirms the syndrome, but rather a diagnostic path that combines medical history, symptomatic criteria, and exclusion investigations.

The Rome IV criteria are based on the diagnosis of:

• recurrent abdominal pain or discomfort,
• associated with at least two of the listed elements:
• relation to defecation,
• change in stool frequency,
• change in stool consistency.

There are also some red flags that require further investigation and can guide the diagnosis of IBS:

• unexplained weight loss,
• blood in stool,
• anemia,
• persistent fever.

The role of the microbiota.

The gut microbiota plays a central role in both clinical conditions, and its regulation can contribute to improving general health.

In subjects suffering from lactose intolerance, the bacteria present in the gut microbiota ferment undigested lactose, causing gas production.

The composition of the microbiota can amplify intestinal sensitivity and gas production; targeted modulation of the microbiota, through diet and supplements, can help reduce symptoms.

Dietary strategies, however, remain central to treating symptoms and improving conditions.

Limiting milk and fresh dairy products, preferring aged cheeses and yogurt (which contain less lactose), selecting and consuming "lactose-free" products for lactose intolerance,

following a personalized diet—possibly low in FODMAPs—avoiding excess alcohol/carbonated drinks and sweeteners, and maintaining regular and balanced meals are health strategies that provide undeniable benefits.

Supplements: a useful support.

Nutras Srl produces supplements that offer and constitute targeted solutions for lactose intolerance.

Lactosolution 15000 offers three different solutions and consumption options to better adapt to daily life and consumer needs:

tablet format, single-dose sachets, and a refillable pill case to carry with you.

Lactosolution 15000 is a food supplement based on the lactase enzyme with added calcium: lactase aids in the digestion of lactose, and calcium helps the regular function of digestive enzymes.

This lactase enzyme breaks down lactose into glucose and galactose, simple sugars that can be digested by the intestine.

A strategy aimed at well-being.

Lactose intolerance and irritable bowel syndrome are two distinct conditions but can occur in the same patient. The key to addressing them is an accurate diagnosis, which avoids unnecessary dietary restrictions and allows for targeted strategies.

The real challenge lies in correcting one’s lifestyle and carefully selecting the right intake of supplements, evaluating their quality and quantity. Those who offer solutions to aid digestion and modulate the microbiota must focus on high-quality products, both in terms of ingredients and formulations.

For those living with these conditions, the path to intestinal well-being is based on personalization, balance, and listening to one's body.