Lactose Intolerant: Should You Be Wary of Histamine in Aged Cheeses?

My short answer is no: if you are only lactose intolerant, the histamine in aged cheeses does not concern you any more than the rest of the population. Len is right on one point: these cheeses can contain a lot of histamine. But lactose intolerance and histamine intolerance are based on two different mechanisms, and the first does not lead to the second.

Len’s Question

After reading our article on cheeses, Len wrote to us (translated from English): “From what I know, hard cheeses that are lactose-free or low in lactose contain more histamine as they age. Histamine can also be a problem for lactose intolerant people. Hence antihistamine tablets. I think avoiding dairy is the most effective solution. What do you think?”

Thank you, Len, the question is good and deserves a detailed answer. We have broken it down into three parts: what is true, what isn’t, and what can be done practically.

What Is True: Histamine Increases During Aging

Cheese histamine does not come from milk. It is produced by bacteria. During aging, milk proteins break down and release an amino acid, histidine. Some bacteria have an enzyme, histidine decarboxylase, which converts histidine into histamine. The main culprit in cheeses is a lactic acid bacterium, Lentilactobacillus parabuchneri. A team from the University of Zaragoza identified it as the main producer in four of the five most histamine-loaded Spanish cheeses they analyzed (Botello-Morte et al., 2022).

The final amount depends on several factors: milk hygiene, raw or pasteurized milk, aging duration and temperature, storage conditions. Some strains even produce histamine at refrigerator temperature (Moniente et al., 2021).

A review published in 2025 compiling decades of analyses gives these rough figures (Gloria et al., 2025):

good quality milk: histamine not detected; whey: low levels;
unaged cheeses (mozzarella, fresh cheeses): up to 64.4 mg/kg;
aged cheeses: up to 423 mg/kg;
commercial grated cheeses: up to 1,154 mg/kg.

The authors note that in some countries, defective cheeses may be used as raw material for grated cheese, partly explaining the last figure. Literature reports values up to 2,500 mg/kg for long-aged cheeses (figure cited by Moniente et al., 2022). In Spain, about a third of 39 commercial cheeses contained more than 200 mg/kg histamine, and two exceeded 500 mg/kg. Most concerned cheeses were made from raw milk, often sheep’s milk (Botello-Morte et al., 2022).

Two qualifiers limit the scope of these numbers:

Gaps are huge from one cheese to another. In the same Spanish study, about half the cheeses contained no detectable histamine. “Aged” doesn’t mean “full of histamine.”
Histamine varies within the same cheese wheel. Researchers analyzed four zones of twelve long-aged cheeses. Histamine concentrated in the heart of the wedge, and the lowest level was near the outer rind (Moniente et al., 2022). Depending on where you cut, the measured value can vary widely.

Other amines, like tyramine, also accumulate during aging (Natrella et al., 2024; Campos-Góngora et al., 2023). They do not specifically concern lactose intolerant individuals either.

What Isn’t True: Two Intolerances, Two Mechanisms

Lactose intolerance arises from a lack of lactase, the enzyme that breaks down milk sugar in the small intestine. Undigested lactose reaches the colon, where it ferments. Symptoms are digestive: bloating, gas, pain, diarrhea.

Histamine intolerance is a non-allergic reaction. It is mainly attributed to a defect in degrading dietary histamine in the intestine due to another enzyme, diamine oxidase (DAO) (Schnedl & Enko, 2021). It can also cause digestive issues. However, it often manifests with symptoms outside the gut: facial flushing, itching, hives, headaches, low blood pressure (Hrubiško et al., 2021; Jochum, 2024).

The two terms are similar because doctors modeled “histamine intolerance” after lactose intolerance: in each case, an enzyme deficiency is involved (Schnedl & Enko, 2021). But these are not the same enzymes. Having low lactase does not reduce your DAO.

The two intolerances can coexist in the same person though. This happens especially when the intestinal lining is damaged by disease, which may reduce several enzymes at once. An Austrian team found low blood DAO values in 55% of patients followed for sugar intolerance or malabsorption (Schnedl & Enko, 2021). However, these were patients already referred to specialist consultation, not random lactose intolerant people. Also, blood DAO measurement is not a validated test (see below). This figure does not show that lactose intolerance causes histamine intolerance.

A Difficult Intolerance to Measure

Histamine intolerance is often said to affect about 1% of the population (Hrubiško et al., 2021). This figure remains uncertain because no validated diagnostic test accepted by all exists. Blood DAO measurement lacks established reference values and does not necessarily reflect what happens in the intestine (Hrubiško et al., 2021). In double-blind trials, people who claimed to be intolerant reacted randomly to histamine, and sometimes to placebo. Diagnosis mostly relies on thorough history taking and excluding other causes (Hrubiško et al., 2021; Jochum, 2024). Low-histamine diets have been studied for a long time (Wantke et al., 1993). Yet, food avoidance lists vary a lot between diets: only fermented foods are unanimously excluded (Sánchez-Pérez et al., 2021).

What About Antihistamines?

According to scientific reviews, the use of antihistamines for histamine intolerance is empirical: no randomized trial has demonstrated their benefit for this indication. If prescribed, it should be thoughtfully and time-limited, with the decision made by the doctor (Hrubiško et al., 2021). Some antihistamines might even reduce DAO activity (Jochum, 2024). Nothing in these studies justifies systematic use by lactose intolerant individuals. They do not affect lactose at all.

Removing All Dairy Is Not the Solution

A review dedicated to lactose intolerance states clearly: total dairy avoidance is no longer recommended. The authors advise limiting lactose rather than eliminating it to maintain calcium, protein, magnesium, potassium, and zinc from milk (Szilagyi & Ishayek, 2018). According to them, dairy provides more of these nutrients per calorie than any other common adult food.

This is also the philosophy of lactose.help: enjoy without deprivation or discomfort.

How Much Lactose Can You Allow?

Lactose intolerance is not a milk protein allergy. Allergy is an immune system reaction requiring strict avoidance and is not managed by thresholds.

According to EFSA (2010), most lactose intolerant people tolerate 6 to 12 g of lactose daily, spread across the day, and the most sensitive react at 3 g per day. On lactose.help, we start from this baseline, about 1 g per meal, then each person determines their own threshold using the lactose challenge from the book. Be careful, lactose adds up over the whole meal.

Long-aged cheeses are among the poorest in lactose (Szilagyi & Ishayek, 2018). To know a cheese’s maximum lactose concentration and the portion size you can allow yourself, use the lactose.help mobile app.

In Practice: Our Response to Len

Your observation about histamine is accurate: it increases during aging, and some cheeses, especially grated and certain long-aged raw milk cheeses, can contain a lot. However, lactose intolerance does not make you more sensitive to histamine, and neither antihistamines nor complete dairy elimination are appropriate responses for lactose intolerance.

Practically:

If you tolerate aged cheeses well, no need to avoid them because of histamine: they are among the best options for lactose intolerant people;
Adjust your portions to your lactose threshold by counting all lactose in the meal.

Disclaimer: I am not a doctor. This article is an analysis based on scientific research articles. In case of doubt, especially if you also have non-digestive symptoms after eating aged cheeses, consult a healthcare professional.

Sources

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