What is lactose Intolerance?
Lactose is the natural sugar, or carbohydrate molecule in milk and milk products, including certain yoghurts. Lactose is a double sugar molecule, which requires an enzyme called Lactase, to break it down before it can be digested. How much lactose a person can consume comfortably, will depend on how much lactase they have in the lining of their digestive tract. If someone eats or drinks more lactose than they can digest, the lactose will stay in the digestive tract and continue its path to the large intestine where it is fermented by the healthy bacteria that live there. This creates gas as a side effect and contributes to bloating and abdominal pain. Lactose is also one of the FODMAPs that is known for attracting water into the digestive tract and causing diarrhoea.
Lactose intolerance is fairly common, especially in certain regions or populations, and has been extensively researched. As a result, we know that most people make some amount of lactase enzyme, and will do well with small amounts of milk in a cup of tea or coffee, but can find larger amounts (say a full cup of milk) problematic for the GI system.
Research shows that most people with lactose intolerance will tolerate about 4-7g of lactose per serve, and up to 12g spread out through the day.(1-4) Although lactose tolerance varies, in our clinical experience we have found traditional strained Greek yogurt to be well tolerated by those on a fodmap diet. Of course, discussing with your own healthcare provider is always the best idea.
Yogurt is the end result of the fermentation process from adding the bacteria, Lactobacillus bulgaricus and Streptococcus thermophilusto milk. These organisms produce bacterial lactase, which converts lactose into lactic acid, and provides that characteristic tangy taste and thick texture in fermented dairy products. As a result of this fermentation, the lactose of yoghurt is significantly reduced (by 20-30%), compared to milk, and is often tolerated better (less bloating, gas, abdominal pain, and diarrhoea).(5) Finally, some yoghurt brands also add therapeutic strains of bacteria, for their probiotic effect or for digestive relief.
Listed below is the lactose content per 6 oz. per email communications with several United States companies:
Yoghurts from Luxembourg and France
General note: Total carbohydrates are listed on the label, as well as what amount is sugar (not added sugar per se). Lactose content for the following yoghurts is listed as grams per 100g/100ml
Grams of lactose (where known) are listed per 100 g serving.
Natural sugars (lactose) per 100 grams:
Understanding Food Labels & Lactose Content
Take away points:
1. Barrett, Jacqueline & Glbson, P.R.. (2007). Clinical Ramifications of Malabsorption of Fructose and Other Short-chain Carbohydrates. Practical Gastroenterology. 31. 51-65.
2. Mansueto, P. , Seidita, A. , D'Alcamo, A. and Carroccio, A. (2015), Role of FODMAPs in Patients With Irritable Bowel Syndrome. Nutrition in Clinical Practice, 30: 665-682. doi:10.1177/0884533615569886
3. Misselwitz, B. , Pohl, D. , Fru ̈hau, H.,Fried, M., Vavricka, S., Fox, M. (2013). Lactose malabsorption and intolerance: pathogenesis, diagnosis and treatment. United European Gastroenterol J, Jun; 1(3): 151–159. doi: 10.1177/2050640613484463
4. Ong, D. K., Mitchell, S. B., Barrett, J. S., Shepherd, S. J., Irving, P. M., Biesiekierski, J. R., Smith, S. , Gibson, P. R. and Muir, J. G. (2010), Manipulation of dietary short chain carbohydrates alters the pattern of gas production and genesis of symptoms in irritable bowel syndrome. Journal of Gastroenterology and Hepatology, 25: 1366-1373. doi:10.1111/j.1440-1746.2010.06370.x
5. Oskar Adolfsson Simin Nikbin Meydani Robert M Russell. Yogurt and gut function The American Journal of Clinical Nutrition, Volume 80, Issue 2, 1 August 2004, Pages 245–256.
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MDiet | BSc (nutrition)
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