Dietary sialic acids: distribution, structure, and functions

Area of Science:

• Biochemistry
• Nutrition Science
• Microbiology

Background:

• Sialic acids (Sias) are vital cell surface glycans involved in numerous biological processes.
• Dietary Sias are found in foods like milk, eggs, and red meat.
• Existing research primarily focuses on endogenous Sias, neglecting dietary sources.

Purpose of the Study:

• To review the distribution, structure, and biological functions of dietary sialic acids.
• To highlight the health implications of consuming Sia-rich foods.
• To explore the potential role of dietary Sias in modulating gut microbiota.

Main Methods:

• Literature review of scientific articles on sialic acids and dietary sources.
• Analysis of the composition and biological roles of Sias in human milk, bovine milk, red meat, and eggs.
• Synthesis of current knowledge on the impact of dietary Sias on human health and gut microbiota.

Main Results:

• Sialylated oligosaccharides are abundant in human breast milk and bovine milk.
• Dietary Sias are present in conjugated forms (sialoglycans) in various food items.
• Consumption of dietary Sias may influence host-pathogen interactions and gut microbial composition.

Conclusions:

• Dietary sialic acids represent an underappreciated factor in human nutrition and health.
• Further research is needed to fully elucidate the mechanisms by which dietary Sias affect the gut microbiome and overall health.
• Sia-rich foods offer a unique dietary source of these important biomolecules.