Dairy intolerance is a term often thrown around when people experience digestive discomfort after consuming milk and dairy products. However, many confuse dairy intolerance with lactose intolerance, two distinct conditions with different causes and management strategies. Understanding this difference is essential to ensure proper diagnosis and treatment.

Understanding Lactose Intolerance

Lactose intolerance refers to the body’s inability to properly digest lactose, a sugar found in milk and dairy products. This occurs when the body produces insufficient levels of lactase, the enzyme responsible for breaking down lactose in the small intestine. Without enough lactase, lactose passes into the colon undigested, where it is fermented by bacteria, causing symptoms such as:

• Bloating
• Diarrhoea
• Gas
• Stomach cramps

Lactose intolerance is common, particularly among people of non-European descent, such as those from East Asia, Africa, and the Middle East, where populations often have a lower prevalence of lactase persistence into adulthood.

Dairy Intolerance: More Than Just Lactose

While lactose intolerance involves issues with lactose digestion, dairy intolerance is a broader term. People with dairy intolerance might react to other components of milk, such as proteins like casein or whey. This can include:

• Casein Intolerance: Some people are intolerant to the protein casein, found in both cow’s and goat’s milk. This can trigger digestive discomfort, respiratory issues, and in rare cases, an immune reaction similar to allergies.
• Whey Protein Intolerance: Whey is another milk protein that can cause gastrointestinal symptoms in sensitive individuals. It’s worth noting that whey is often a by-product of cheese production and is commonly found in processed foods.

Because dairy intolerance can include reactions to proteins as well as lactose, it is a broader and more complex condition than lactose intolerance alone.

Misconceptions and Confusion

Many people experiencing symptoms after consuming dairy products believe they are allergic or intolerant to all forms of dairy, leading to a complete avoidance of milk, cheese, and other dairy items. In reality, they may only be lactose intolerant and can tolerate dairy products that are low in lactose, such as:

• Hard cheeses like cheddar and Parmesan, which contain very little lactose
• Lactose-free dairy products, which are specially formulated by breaking down the lactose
• Fermented dairy, such as yoghurt, where much of the lactose is already broken down by bacteria

This widespread misunderstanding often leads people to unnecessarily restrict their diet, missing out on important nutrients like calcium, vitamin D, and high-quality protein found in dairy products.

Diagnosing Lactose Intolerance

Lactose intolerance is typically diagnosed through:

• Hydrogen breath test: A common test where the person drinks a lactose-containing beverage, and hydrogen levels in the breath are measured. High hydrogen levels indicate improper lactose digestion.
• Lactose tolerance test: Measures blood sugar levels after consuming lactose. A minimal rise in blood sugar suggests lactose is not being properly absorbed.

If a person tests positive for lactose intolerance, they can often still enjoy dairy by managing their intake of lactose-containing foods or by using lactase enzyme supplements such as Lacteeze (I use double strength).

Final Thoughts: Differentiating the Two

In summary, the terms dairy intolerance and lactose intolerance are not interchangeable. Lactose intolerance involves difficulty digesting the sugar in milk, while dairy intolerance can include reactions to various components of milk, including proteins. By understanding the difference, individuals can make more informed choices about their diets and avoid unnecessary restrictions, ensuring they get the nutrients they need.

If you’re experiencing discomfort after consuming dairy, it’s important to seek professional advice. A dietitian or healthcare provider can help determine whether you are lactose intolerant or if there’s a different cause behind your symptoms, helping you adjust your diet accordingly.

Our next article, we talk about how to rebuild your gut health to enable eating dairy again here.