Few foods generate as much confusion as dairy. Many people experience bloating, abdominal discomfort or changes in digestion after consuming milk or dairy products and quickly conclude that they must be lactose intolerant. Others assume that a diagnosis of lactose intolerance means dairy must be eliminated completely.
In reality, the situation is often more nuanced. Understanding what lactose intolerance is, and what it is not, can help prevent unnecessary dietary restriction and make dairy choices far less confusing.
What Is Lactose?
Lactose is the naturally occurring sugar found in milk and dairy products. To digest lactose, the body relies on an enzyme called lactase, which is produced in the small intestine.
Lactase breaks lactose into two smaller sugars, glucose and galactose, which can then be absorbed into the bloodstream. When lactase production is reduced, some lactose passes undigested into the large intestine, where it becomes food for gut bacteria. As bacteria ferment the lactose, they produce gases and other by-products that can contribute to the symptoms commonly associated with lactose intolerance.
Common Symptoms
The symptoms of lactose intolerance can vary from person to person but may include:
- Bloating
- Excessive gas
- Abdominal discomfort
- Cramping
- Diarrhoea
- Stomach rumbling or gurgling
Symptoms typically occur within a few hours of consuming lactose-containing foods, although the timing and severity can vary considerably.
Lactose Intolerance Is Not A Dairy Allergy
One of the most common misconceptions is that lactose intolerance and dairy allergy are the same thing.
They are not.
Lactose intolerance is a digestive issue involving reduced activity of the lactase enzyme. A dairy allergy, by contrast, involves the immune system reacting to proteins found in milk. Allergic reactions may cause symptoms such as hives, swelling, wheezing or, in severe cases, anaphylaxis.
The underlying mechanisms are entirely different, as are the implications for management.
Not Every Dairy Reaction Is Lactose Intolerance
Another common misconception is that any symptom occurring after dairy consumption must be caused by lactose. Again, this is not necessarily the case.
Some people may react to milk proteins rather than lactose. Others may have irritable bowel syndrome or another gastrointestinal condition that affects how dairy foods are tolerated. Conditions such as coeliac disease can also damage the lining of the small intestine and reduce lactase production, resulting in secondary lactose intolerance.
In some cases, dairy simply becomes the food that receives the blame because it is eaten regularly, when the real cause lies elsewhere. Before concluding that lactose is the problem, it is worth making sure that lactose is actually the culprit.
Many People Can Still Eat Dairy
Perhaps the biggest misconception of all is that lactose intolerance means dairy must be avoided completely. For many people, this is simply not true.
Most individuals with lactose intolerance retain some ability to digest lactose. The amount varies from person to person, but complete intolerance is relatively uncommon. Many people can comfortably tolerate small amounts of lactose, particularly when consumed with a meal rather than on an empty stomach.
Certain dairy foods are also naturally lower in lactose than others. For example, many hard cheeses contain very little lactose, while yoghurt is often better tolerated because the bacterial cultures help break down some of the lactose during fermentation.
Lactose-free milk and dairy products provide another option for those who wish to continue consuming dairy without the associated symptoms.
The goal is often not complete avoidance, but rather finding an amount and type of dairy that an individual can comfortably tolerate.
What About Lactase Supplements?
Lactase enzyme supplements are also available and may help some individuals digest lactose-containing foods more comfortably. These products provide the enzyme that the body is producing in reduced amounts, helping break down lactose before it reaches the large intestine.
They are not necessary for everyone, but they can be useful in certain situations, particularly when eating away from home or consuming foods with a higher lactose content.
The Bottom Line
Lactose intolerance is common, but it is often misunderstood.
It is not a dairy allergy, it does not necessarily explain every symptom that occurs after eating dairy and it does not automatically mean dairy must be avoided completely.
Many people with lactose intolerance can continue to enjoy at least some dairy foods by choosing lower-lactose options, adjusting portion sizes or using lactase supplements when appropriate.
Most importantly, before removing an entire food group from the diet, it is worth making sure that lactose is actually the problem. The solution may be far simpler and far less restrictive than many people realise.
If you’re unsure whether lactose is responsible for your symptoms, our practitioners at Vive can help you work through the possibilities and develop a practical plan tailored to your situation. Appointments can be booked through Vive Clinic
Article written by
Peter Christinson
Certified Practicing Nutritionist
Vive Health – Retail and Clinic Manager
