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Infant Nutrition and Immunity

November 19, 2015
by David Bouckaert
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The colon is the largest participant in the body’s immune system. Nearly sterile when a baby is born, the gut quickly is colonized by a multitude of bacteria that make up its microbiota. The immunomodulating effects of the microbiota, along with its ability to compete with and defend against pathogenic bacteria in food, are thought to positively impact health. Increasingly, the relationship between the microbiota and health rapidly is becoming better understood.

Building a Healthy Microbiota

Breastfeeding confers numerous benefits to babies, among them, a stable and balanced microbiota. Breast milk is naturally high in oligosaccharides that cannot be digested in the small intestine. They travel intact to the colon, where they nourish and are fermented by beneficial bacteria, including bifidobacteria. In this way, breast milk serves as a prebiotic, with its oligosaccharides stimulating the growth and activity of the bacteria that make up the baby’s microbiota. It has been shown that the microbiota of babies who are breast-fed is dominated by beneficial bifidobacteria (Harmsen et al, 2000; Turroni et al, 2012).

As breast-feeding is best, it is an important goal for infant food manufacturers that infant feeding formulas come as close as possible to breast milk with respect to the physiological effects of the formula milk. Not all formulas, however, contain added non-digestible oligosaccharides that provide support for the microbiota. Babies fed traditional formula have been shown to have lower bifidobacteria counts than breast-fed babies (Closa-Monasterolo et al, 2013). Closa-Monasterolo’s team and Veereman-Wauters et al (2011) showed that babies whose formula was supplemented with a combination of inulin-type fructans from chicory root, (Orafti® Synergy1), developed a bifidobacteria count that more closely resembled that of breast-fed infants.

Inulin-type Fructans and Health

The microbiota is vital to the immune system, the body’s line of defense against illness. Children in day care settings are exposed to a wide variety of potentially disease-causing bacteria. It has been shown that healthy children 4-24 months in age in day care settings who received 1.1 g/d oligofructose over a six-month period had lower incidence of fever, less need for phone consultation, and fewer visits to a doctor associated with episodes of diarrhea, along with less fever accompanying cold symptoms and less need for antibiotics during respiratory illnesses, as compared to a control group (Saavedra & Tschernia, 2002). They also had improved gastrointestinal comfort, with less emesis, regurgitation, and discomfort. A meta-analysis of five randomized controlled trials (RCTs) on children 0-24 months of age concluded that children receiving the prebiotic oligofructose or inulin/oligofructose for 6-12 months had fewer infections overall (1 RCT) and fewer infections requiring antibiotics (4 RCTs) (Lohner et al, 2014).

Summary

The study of the relationship between the microbiota and immunity is an area of emerging science. The BENEO-Institute is actively conducting and supporting research in this area in order to better understand the ability of the microbiota to impact health and immunity and the role of prebiotics such as inulin-type fructans in nourishing a healthy microbiota.

 

References

Closa-Monasterolo R, et al. Safety and efficacy of inulin and oligofructose supplementation in infant formula: results from a randomized clinical trial. Clin Nutr. 2013; 32:918-27. http://www.clinicalnutritionjournal.com/article/S0261-5614%2813%2900055-1/abstract

Harmsen HJ, et al. Analysis of intestinal flora development in breast-fed and formula-fed infants by using molecular identification and detection methods. J Pediatr Gastroenterol Nutr. 2000; 30:61-7. http://www.ncbi.nlm.nih.gov/pubmed/10630441

Lohner S, et al. Prebiotics in healthy infants and children for prevention of acute infectious diseases: a systematic review and meta-analysis. Nutr Rev. 2014; 72:523-31. http://www.ncbi.nlm.nih.gov/pubmed/24903007

 Saavedra JM, Tschernia A. Human studies with probiotics and prebiotics: clinical implications. Br J Nutr. 2002;87 Suppl 2:S241-6. http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=906444&fileId=S0007114502001010

Turroni F, et al. Diversity of bifidobacteria within the infant gut microbiota. PLoS One. 2012;7(5):e36957. http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0036957

Veereman-Wauters G, et al. Physiological and bifidogenic effects of prebiotic supplements in infant formulae. J Pediatr Gastroenterol Nutr. 2011; 52:763-71. http://www.ncbi.nlm.nih.gov/pubmed/21593649

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