Lactose.help Blog

Because everything depends on how much lactose remains in the finished product, not on its name or designation.

Lactose is a water-soluble sugar. When cheese is made, most of it leaves with the whey that separates from the curd. The more the curd is drained, the less lactose remains. And if the cheese is then aged, bacteria gradually consume the residual lactose. As a result, most aged cheeses contain very little. Concretely, 76% of the European protected-designation cheeses analysed (PDO, PGI) show 0.5 g of lactose or less per 100 g — that's 200 g before reaching 1 g of lactose, the dose well tolerated by almost all intolerant people.

Butter contains fairly little, since it is essentially fat. Yogurt contains less than milk, but still too much for most intolerant people. And milk remains the most concentrated source, hence the problem.

An important point: even within a single designation, the concentration varies from one producer to another. That's why the lactose.help app doesn't reason at the level of the designation, which isn't actionable, but at the level of the specific product. It relies on the factual information on the label — the ingredient list and nutritional composition — as required by the European INCO regulation (Regulation (EU) No 1169/2011), values that producers establish through laboratory analysis.

Learn more : Lactose free cheese

Feelings alone are not enough, and sorting out the different possible causes is complicated. The symptoms overlap widely: bloating, gas, cramps or diarrhoea are also found in reflux, irritable bowel syndrome or milk protein allergy, which is a condition entirely distinct from intolerance.

An important point: being intolerant isn't just about digesting lactose poorly. You have to both malabsorb it AND experience the symptoms. Many people malabsorb it without the slightest discomfort.

Confirmation comes from a medical test, mainly the hydrogen breath test: it must come back positive, a sign of malabsorption, and be accompanied by the symptoms. In any case, consult a healthcare professional to rule out another cause before cutting out dairy products unnecessarily.

Learn more : Lactose Intolerance Test

The non-invasive reference remains the hydrogen breath test: undigested lactose ferments in the colon and produces hydrogen that is measured in the breath. The genetic test for lactase persistence is very specific but indicates a predisposition, not the intensity of the symptoms. The blood glucose tolerance test also exists. To avoid: the so-called "food intolerance" IgG tests, which are not validated for this diagnosis. Online quizzes are worthless on their own and may push you to eliminate dairy products unnecessarily.

Learn more : Lactose Intolerance Test

Lactose isn't limited to milk and yogurts. It is found in many processed products: sauces, breadings, some pastries, breakfast cereals, cured meats such as salami, and sometimes medicines, where lactose often serves as an excipient.

The terms to spot in the ingredient list: milk, milk powder, lactose, whey (also called milk serum), milk proteins, casein, caseinate.

Be careful: "milk proteins" does not mean "lactose-free". Depending on the manufacturing process, residual lactose may remain, sometimes in a significant amount. The right reflex is to consider any dairy derivative as potentially carrying lactose, rather than trusting the ingredient's name.

In any case, reading the ingredient list is far more reliable than judging by the product's appearance, and the Lactose.help app's scan automates that reading in a few seconds.

Learn more : Milk Protein on the Label: Pure Protein or Hidden Lactose?

They are two distinct problems.

Lactose intolerance is a difficulty digesting a sugar, lactose, due to the absence or too limited production of lactase, the enzyme that breaks lactose down into glucose and galactose, two sugars we all digest without any trouble. It causes digestive symptoms: bloating, gas, cramps, diarrhoea.

Milk protein allergy is something else entirely: a reaction of the immune system, which can lead to hives, oedema or respiratory signs, and which often occurs quickly after ingestion. This is a central distinction, particularly in children.

Practical consequence: a "lactose-free" product may very well contain milk proteins. It is therefore not suitable in case of allergy, even if it is fine for intolerance. If you suspect an allergy, consult a doctor.

Learn more : Lactose Intolerance: Symptoms, Variability, and Practical Solutions

A completely lactose-free diet isn't necessary for most people, and it even has a drawback: it needlessly deprives you of calcium and complicates daily life.

A study by the EFSA (European Food Safety Authority) shows that intolerant people generally tolerate between 6 and 12 g of lactose per day, provided it is spread over several meals. The most sensitive react from as little as 3 g, but a dose of 1 g per meal is fine for just about everyone.

The right approach is therefore not to cut everything out, but to find your personal threshold: a short reduction phase to calm the symptoms, then a gradual reintroduction of increasing amounts to identify your limit. This is exactly the principle of the "lactose challenge" detailed in the book. Keep in mind: this threshold isn't fixed, it can drop during periods of fatigue or stress.

Once you know your threshold, the practical reflex is to reason about the maximum dose of lactose a product can contain, not about a supposed value. If even that worst case stays below your threshold, the product is safe for sure. That's precisely what the Lactose.help app's scan calculates.

Learn more : Lactose

There is no universal dose. Lactase's effectiveness is real but modest and variable: it depends on the amount of lactose in the meal, on your sensitivity, and above all on timing. The key point many forget: the enzyme must be present when the lactose reaches the small intestine. Taken three hours later, it is almost useless. So you take it just before eating, and repeat the dose during a meal that drags on. The dose, measured in FCC units, is adjusted to the amount of lactose expected. Finally, not all brands are equal: the source of the enzyme, its resistance to stomach acidity and its coating make the real effectiveness vary, and the stated content doesn't always reflect the digestive result. In short, lactase is a useful supplement, not a guarantee: knowing the lactose content of foods remains essential.

Learn more : Relieving Lactose Intolerance Symptoms After a Slip-Up or Mistake ;)

Yes, they often improve lactose digestion, but their effect is modest and variable, not a guarantee for every meal. Commercial preparations generally hydrolyse 70 to 90% of the lactose in a dairy product: enough to help you stay below your tolerance threshold, not to eat without limits.

If lactase "never works" for you, it's often because it is underdosed relative to the meal, taken at the wrong time (it must be present when the lactose reaches the intestine, so take it just before eating), or because your symptoms don't come only from lactose. Also worth knowing: not all brands are equal, depending on the source of the enzyme and its resistance to stomach acidity.

An often more effective alternative: consume products already treated with lactase, such as lactose-free milk, because the enzyme has had time to act before ingestion. Worth testing depending on your situation.

Learn more : Hiking the Tour du Mont Blanc Trail with Lactose Intolerance: Planning, Products and Pitfalls

Yes, even if it is rarely "all of a sudden" in the biological sense. After weaning, lactase production naturally declines in the majority of humans: the enzyme persisting into adulthood is the exception, not the rule. About 70% of the world's population ends up poorly absorbing lactose, but poorly absorbing it isn't being intolerant: only about a third of the people concerned actually develop symptoms. The feeling of suddenness comes from crossing a threshold: the decline is gradual, but symptoms only appear the day the remaining lactase is no longer enough for the amount of lactose consumed, often between 30 and 40 years of age.

Intolerance can also be secondary, triggered by damage to the small intestine: gastroenteritis, coeliac disease, an inflammatory disease such as Crohn's disease, surgery. In that case, the trigger is identifiable. A prolonged stop of dairy products can also cause the microbiota to lose its adaptation and lower the threshold when you resume. When in doubt, a medical assessment is better than a total elimination of dairy products from the outset.

Learn more : Lactose

The typical symptoms are digestive: bloating, gas, gurgling, abdominal cramps, diarrhoea or loose stools, sometimes nausea. They generally appear between 30 minutes and 2 hours after ingestion, the time it takes for the undigested lactose to reach the colon and be fermented by the bacteria. Their intensity varies according to the dose ingested, your intestinal flora and your personal threshold. Conversely, hives, oedema or respiratory discomfort point towards an allergy, not towards an intolerance.

Learn more : Lactose Intolerance: Symptoms, Variability, and Practical Solutions