Lactose intolerance around the world

Lactase is abundant in infancy and may decline after weaning in many people. In some populations, inherited lactase persistence allows lactose digestion into adulthood; in others, reduced lactase activity is more common. These broad patterns do not diagnose an individual. A person’s symptoms can also change after intestinal illness or with the amount and type of dairy eaten. Lactose intolerance is different from milk allergy, which involves an immune response. Abdominal pain, bloating and diarrhoea after dairy are clues to discuss, not proof of a cause.

Use your own symptom pattern rather than assuming tolerance from family background or nationality. Track portions and timing, and discuss a structured reduction followed by reintroduction with a clinician. Many people tolerate some yoghurt, hard cheese or smaller portions, while lactose-free foods can offer alternatives. If dairy is reduced, replace its nutrients with suitable fortified foods or other dietary sources. Food Intolerance Testing may be considered when the history is uncertain, and Nutrition Counselling can adapt advice to culture, budget and usual meals.

Arrange medical review for symptoms that are new, persistent, severe, unrelated to dairy or associated with weight loss, blood in stool, fever or repeated vomiting. Seek urgent help for severe pain, faintness, dehydration, breathing difficulty or swelling. These features may point to another digestive problem, infection or allergy and need timely evaluation.

Ask whether your symptoms fit lactose intolerance, whether another diagnosis should be checked, and how to trial dairy changes without creating nutritional gaps. Mention the foods and portions that are part of your usual cultural diet.