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The Science behind the Lactose Intolerance

5W's & 1H - With References at the end of the article.

20 Apr '24
4 min read


Have you ever heard of the lactose intolerance? Well, if not let's try to make you understand what exactly Lactose Intolerance and the ways is and measures to prevent it.

Lactose intolerance is a common digestive problem where the body is unable to digest lactose, a type of sugar mainly found in milk and dairy products. Increasingly prevalent in today’s global population, it sparks conversations about diet, genetics, and adaptation. This story explores what lactose intolerance is, its rising occurrence, and how those affected can manage their condition effectively.

Lactose intolerance results from the inability of the body to produce enough lactase, an enzyme necessary for digesting lactose. Unlike a milk allergy, which is an immune response to proteins in milk, lactose intolerance centres on the digestive system’s challenge in breaking down lactose, leading to discomfort and gastrointestinal symptoms.

Globally, it’s estimated that about 68% of the population may experience some degree of lactose intolerance, with variations across different ethnic and racial groups. Factors contributing to its development include genetics-where certain populations have higher predispositions, as lactase production decreases with age, and specific medical conditions or surgeries affecting the small intestine. The perception of its growing prevalence may be due to increased awareness and diagnostic rates.

Symptoms of lactose intolerance include bloating, diarrhoea, gas, and abdominal pain, usually occurring within a few hours of consuming lactose-containing foods. Diagnosis often involves medical history assessment, lactose tolerance tests, and sometimes hydrogen breath tests to confirm lactose malabsorption.

Managing lactose intolerance primarily involves dietary adjustments to minimize or avoid lactose consumption. Foods commonly to be avoided or consumed in moderation include milk, cheese, and certain dairy products. Fortunately, lactose-free milk and dairy alternatives, such as soy, almond, and oat milk, are widely available. Reading food labels and being mindful of hidden lactose sources is crucial.

Recent research continues to shed light on lactose intolerance, exploring everything from genetic factors to innovative treatments.

Healthcare professionals emphasize the importance of a balanced diet while managing lactose intake and the potential for some individuals to tolerate small amounts of lactose, particularly when consumed with other foods. Recent studies emphasize the importance of distinguishing between lactose intolerance and milk allergy, understanding the genetic basis, and implementing effective dietary management. Researchers also highlight the role of the gut microbiome in lactose digestion and the potential benefits of a low-FODMAP diet for those with irritable bowel syndrome and lactose intolerance.

Lactose intolerance is a manageable condition that requires awareness and dietary adjustments. It’s important to consult healthcare professionals for accurate diagnosis and personalized advice on managing lactose intolerance and ensuring a balanced diet and a healthy lifestyle.

The ongoing research continues to explore the underlying mechanisms, prevalence rates, and potential long-term health implications of lactose intolerance. With increased awareness and accessible lactose-free alternatives, individuals with this condition can maintain a balanced and healthy diet while minimizing the uncomfortable symptoms associated with lactose intolerance.




  1. Deng, Y., Misselwitz, B., Dai, N., & Fox, M. (2015). Lactose Intolerance in Adults: Biological Mechanism and Dietary Management.
  2. Catanzaro, R., Sciuto, M., & Marotta, F. (2021). Lactose intolerance: An update on its pathogenesis, diagnosis, and treatment.
  3. Misselwitz, B., Butter, M., Verbeke, K., & Fox, M. (2019). Update on lactose malabsorption and intolerance: pathogenesis, diagnosis and clinical management.
  4. Swallow, D. M. (2003). Genetics of lactase persistence and lactose intolerance. Annual Review of Genetics, 37(1), 197-219.
  5. Szilagyi, A. (2015). Adult lactose digestion status and effects on disease. Canadian Journal of Gastroenterology and Hepatology, 29(3), 149-156.
  6. Deng, Y., Misselwitz, B., Dai, N., & Fox, M. (2015). Lactose intolerance in adults: Biological mechanism and dietary management. Nutrients, 7(9), 8020-8035.
  7. Bayless, T. M., Brown, E., & Paige, D. M. (2017). Lactose intolerance and health. National Institute of Diabetes and Digestive and Kidney Diseases.
  8. Szilagyi, A., Nathwani, U., Vinokuroff, C., Pannozzo, J., & Colbourne, G. (2021). Lactose malabsorption and intolerance: A systematic review and meta-analysis of prevalence and nutritional impact. Nutrients, 13(7), 2296.



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Category : Health and Wellness


Written by Younus M. Bhat

I am a columnist, author, and a PhD scholar with a passion for sharing my knowledge and expertise with others. Visit: Email: [email protected], Stay Happy😊