Dietary galactooligosaccharides increase calcium absorption in normal and gastrectomized rats

Area of Science:

• Gastroenterology and Nutrition Science
• Prebiotic Research
• Bone Metabolism

Background:

• Partial gastrectomy, particularly Billroth II procedures, can lead to malabsorption and nutritional deficiencies, including calcium.
• Osteopenia is a common complication following gastric surgery due to impaired nutrient absorption.
• Prebiotics like galactooligosaccharides (GOS) are known to modulate gut microbiota and improve nutrient bioavailability.

Purpose of the Study:

• To investigate the effect of galactooligosaccharides on calcium absorption in a rat model of partial gastrectomy.
• To determine if GOS supplementation can mitigate the negative effects of gastrectomy on calcium balance.
• To assess the potential of GOS in preventing osteopenia in post-gastrectomy patients.

Main Methods:

• A partial gastrectomy (Billroth II) or sham operation was performed on rats.
• Animals were fed either a control diet or a diet supplemented with galactooligosaccharides (50 g/kg) for eight weeks.
• Serum calcium concentrations were measured to assess calcium absorption and balance.

Main Results:

• Rats supplemented with galactooligosaccharides exhibited significantly lower fecal calcium excretion compared to controls.
• Apparent calcium absorption was notably higher in both gastrectomized and normal rats fed GOS-enriched diets.
• GOS supplementation demonstrated a positive impact on calcium homeostasis in the gastrectomized model.

Conclusions:

• Ingestion of galactooligosaccharides effectively prevents osteopenia in partially gastrectomized rats.
• GOS represents a promising dietary strategy to improve calcium absorption and bone health after gastric surgery.
• Prebiotic supplementation may be beneficial for managing nutritional complications following gastrectomy.