Nutrition Clinical Trial
Official title:
Immunity Modification of Full Term Infants According to the Type of Feeding and Mode of Delivery
This is a single-center, double-blind, randomized controlled trial, with parallel groups and reference group. The aim of the study was to investigate whether feed a fermented formula milk leads to an increase of anti-microbial peptides such as catelecidine, alpha and beta defensins and secretory-IgA, compared to feed a standard formula (Plasmon Primigiorni), according to mode of delivery. Breastfed infants were the reference group.
The microbiota plays an important role in modulating the development of the immune system,
making decisive the interrelation that between nutrition, microbiota and immune cells to
modulate long-term health outcomes.
The type of feeding, especially breastfeeding, and the type of delivery are factors that can
contribute to the development of the microbiota. Specifically, the exclusive breastfeeding
promotes the development of bifidobacteria that promotes protection against potential
infections and the development of the immune system.
In recent years it was improved the biological effects of formula milk, that represent the
substitutes of breast milk when this is not available or if there are contraindications to
breastfeeding. Functional foods derived from fermentation of cow's milk with probiotic
strains have been proposed for the prevention of infectious diseases of the child. Recently,
in a monocentric double-blind prospective study, the efficacy of fermented cow's milk with
Lactobacillus paracasei CBA L74 was evaluated in the prevention of common winter infections
in children aged between 12 and 48 months. In this study, children treated with fermented
milk had a lower incidence of respiratory and gastrointestinal tract infections compared to
the control group. This effect was associated with a significant stimulation of innate
immunity (α- and β-defensin, LL-37) and acquired (secretory IgA) and to a modulation of
composition and function of the intestinal microbiota characterized by a significant increase
in strains producing butyric acid (Firmicutes phyla). The nutritional intervention was very
well accepted by the children and no adverse events were observed.
Primary objectives of this study were:
To evaluate whether the feeding with a fermented formulated milk determines an increase in
anti-microbial peptides such as catelecidine, alpha and beta defensin and secretory IgA
compared to the feed with the standard formula (Plasmon Primigiorni), with reference to the
mother's milk.
Secondary objective:
- Value the tolerance in the two groups of infants fed with the two formulas in the study,
with reference to the group of infants fed with breast milk.
- Value the modifications of the intestinal microbiota in the two groups of infants fed
with the two formulas in the study, with reference to the group of infants fed with
breast milk.
Study design: Single-center, randomized, double-blind, parallel group study with reference
group.
Methods:
- Evaluation of the anthropometric parameters (weight, length and cranial circumference)
- Evaluation of body composition by plethysmography
- Evaluation of the gastrointestinal tolerance of fermented formulated milk by means of
data collection and diary delivery to the parents of the participants
- Evaluation of the safety of fermented formulated milk by recording adverse events
- Determination of faecal samples of antimicrobial peptides (defensins, catelecidines),
IgA, microbiota and metabolome.
Infants will be enrolled at birth (within 7 days of life) upon acquisition of the informed
consent of both parents.
At the time of enrollment, newborns who take breast milk due to the absence of breast milk
will be randomized to receive up to the third month of age or a fermented formulated milk or
a standard formula (Plasmon First Days).
Enrollment will be carried out by promoting and supporting breastfeeding and, in the event of
exclusive breastfeeding forecasts for at least the first 3 months of age, newborns will be
included in the study as a control group.
There are 3 medical visits to enrollment (V0), the first (V1) and the third month of life
(V2).
During the visits the anthropometric parameters, the body composition, and the gastroenteric
tolerance will be evaluated. A stool sample will also be collected at the three points of the
life study in order to determine the anti-microbial peptides (catelecidine, alpha and beta
defensin) and the secretory IgA, and perform the analysis of the microbiota and the
metabolome.
Statistical analysis:
The sample size was determined to identify between the two groups of infants, the one that
received the fermented formulated milk and the one that received standard formulated milk
(Plasmon Primigiorni), a difference in the content of faecal α-defensins on samples of feces.
Considering the results of the effect of a treatment with milk fermented with L. paracasei
CBA L74 on fecal α-defensins in children attending preschool centers mean value (DS) vs
placebo [4.8 (4.2) vs 1 (0.6), respectively] we calculated that 12 newborns are needed per
group with a power of 84% and an alpha of 0.05. Assuming a 30% drop-out rate, at least 16
newborns per group must be recruited.
Criteria for the evaluation of variables The descriptive analyzes will be performed by
calculating mean, median and standard deviations for the continuous variables and expressing
the distribution of the frequencies for the discrete variables. The main analysis will resort
to tests for independent samples, Student or Mann-Whitney tests according to the distribution
of the outcome variables. To jointly analyze the trend in time from V0 to V2 of the outcome
variables in the two groups, the one that received the fermented formulated milk and the one
that received the standard formula, based on the type of delivery (spontaneous or cesarean)
will be used regression models for repeated measurements (random effects models or GEE
models).
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