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Human Milk Oligosaccharides (HMOs) – Functions & Benefits
Human Milk Oligosaccharides (HMOs) are complex sugar molecules found in breast milk that support the immune system and gut health of infants.
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Human Milk Oligosaccharides (HMOs) are complex sugar molecules found in breast milk that support the immune system and gut health of infants.
What Are Human Milk Oligosaccharides?
Human Milk Oligosaccharides (HMOs) are a highly diverse group of complex carbohydrates found naturally in human breast milk. At concentrations of 5 to 20 grams per liter, they are the third most abundant solid component of breast milk, after lactose and fats. More than 200 distinct HMO structures have been identified to date. The most prevalent include 2'-Fucosyllactose (2'-FL) and Lacto-N-neotetraose (LNnT).
Biological Functions
HMOs perform a wide range of important biological functions in the infant body:
- Prebiotic effect: HMOs are not digested in the infant gut and pass intact into the large intestine, where they serve as a food source for beneficial bacteria, particularly Bifidobacterium species, thereby positively shaping the gut microbiome.
- Immune modulation: HMOs contribute to the maturation and regulation of the immune system by directly stimulating immune cells and influencing cytokine production.
- Protection against infections: HMOs act as anti-adhesives, binding to pathogens such as bacteria and viruses and preventing them from attaching to the gut lining.
- Gut barrier support: HMOs promote the integrity of the intestinal epithelial barrier, protecting against inflammation and pathogen invasion.
- Brain development: Certain HMOs, particularly sialylated structures such as sialyllactose, may play a role in central nervous system development.
Sources and Occurrence
HMOs are found almost exclusively in human breast milk. Their composition and concentration vary individually between mothers and depend on the stage of lactation (colostrum, transitional milk, mature milk) as well as the mother's blood group characteristics (secretor status). Cow's milk contains structurally similar compounds called bovine Milk Oligosaccharides (bMOs), but in much lower variety and concentration.
HMOs in Infant Formula
Since breastfed infants demonstrably enjoy health advantages over formula-fed infants, there is considerable interest in incorporating HMOs into infant formula. Today, select HMOs — primarily 2'-FL and LNnT — are produced biotechnologically and added to commercial infant formulas. Clinical studies show that these enriched formulas are well tolerated and may positively influence certain immune markers.
Scientific Evidence
Research into HMOs has grown substantially over the past two decades. Clinical studies and animal experiments support prebiotic, anti-infective, and immunomodulatory effects. Particularly well-studied is the role of HMOs in reducing the risk of necrotizing enterocolitis (NEC) in preterm infants and in promoting a healthy gut microbiome. Further research is investigating potential effects on allergies, autoimmune conditions, and cognitive development.
Safety and Tolerability
HMOs naturally present in breast milk are considered very safe. Biotechnologically produced HMOs added to infant formulas have also been classified as safe by regulatory authorities including the European Food Safety Authority (EFSA) and the U.S. Food and Drug Administration (FDA). Adverse effects are rare and typically mild.
References
- Bode, L. (2012). Human milk oligosaccharides: Every baby needs a sugar mama. Glycobiology, 22(9), 1147–1162. https://doi.org/10.1093/glycob/cws074
- European Food Safety Authority (EFSA). (2015). Scientific Opinion on the safety of lacto-N-neotetraose (LNnT) as a novel food ingredient. EFSA Journal, 13(12), 4299.
- Jeurink, P. V., et al. (2013). Human milk: A source of more life than we imagine. Beneficial Microbes, 4(1), 17–30. https://doi.org/10.3920/BM2012.0040
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