What should you know about dairy lactose intolerance?

Lactase is an enzyme that breaks lactose into smaller sugars in the small intestine. When lactase activity is low, undigested lactose passes onward and is fermented by gut bacteria. Bloating, abdominal pain, gas and diarrhoea can follow, often after milk or a large lactose-containing serving. Tolerance differs between people and between foods; some can manage small portions or fermented products. Similar symptoms may arise from other food intolerances or bowel conditions, so a symptom pattern is not a diagnosis by itself.

Write down what you eat, how much you eat, when symptoms begin and how long they last. A clinician may recommend a structured dietary trial, lactose-free substitutions or testing. Nutrition Counselling can help you maintain calcium and other nutrients while adjusting dairy. Check labels carefully because lactose may appear in foods that are not obviously milk-based. Do not assume that every abdominal symptom requires permanent avoidance.

Book an assessment if symptoms are recurring, interfere with eating, or continue when dairy is absent. Seek prompt care for blood in stool, persistent vomiting, fever, unexplained weight loss, severe abdominal pain or prolonged diarrhoea. Breathing difficulty, facial swelling or widespread hives after dairy suggests an allergic reaction and needs urgent help; allergy is different from lactose intolerance.

Ask whether your pattern fits Lactose Intolerance, whether Food Intolerance Testing is useful, and how to trial lactose reduction without nutritional gaps. Ask how to distinguish intolerance from allergy or another cause of diarrhoea.