Serum cholesterol and bowel flora in the newborn

Area of Science:

• Infant nutrition and metabolism
• Microbiology and gut microbiome
• Pediatric gastroenterology

Background:

• Bottle-fed infants typically exhibit elevated serum cholesterol levels in early life.
• The infant gut microbiome composition, particularly the ratio of Escherichia coli to Lactobacilli, is influenced by feeding practices.

Purpose of the Study:

• To investigate the relationship between gut bacterial composition and serum cholesterol levels in bottle-fed infants.
• To determine if altering the gut microbial balance can impact infant serum cholesterol.

Main Methods:

• Monitoring serum total cholesterol in bottle-fed infants.
• Analyzing stool samples for the presence and ratio of Escherichia coli and Lactobacilli.
• Modifying infant formula by adding bicarbonate or Lactobacilli to assess impact on gut bacteria and cholesterol.

Main Results:

• On day five, bottle-fed infants had a mean serum cholesterol of 147 mg/100 ml, with Escherichia coli predominant in stools.
• Supplementing feeds with bicarbonate or Lactobacilli shifted the bacterial ratio, favoring Lactobacilli.
• This microbial shift was associated with a significant decrease in serum cholesterol to a mean of 119 mg/100 ml within three days.

Conclusions:

• Lactobacilli predominance in infant stools correlates with lower serum cholesterol levels.
• Modulating the gut microbiome through dietary interventions may be a viable strategy to manage cholesterol in infants.
• Lactobacilli may play a crucial role in the metabolism of cholesterol during early development.