Inulin-type fructans modulate intestinal Bifidobacterium species populations and decrease fecal short-chain fatty...

Area of Science:

• Microbiology
• Human Nutrition
• Metabolism

Background:

• Inulin-type fructans (ITF) are prebiotics known to influence gut microbiota composition and activity.
• Obesity is associated with altered gut microbiota and metabolic dysfunction.
• Fecal short-chain fatty acids (SCFA) are microbial metabolites linked to host health.

Purpose of the Study:

• To investigate the effect of ITF supplementation on fecal SCFA concentrations in obese women.
• To explore the relationship between changes in Bifidobacterium species, SCFA levels, and host metabolic markers.

Main Methods:

• A 3-month randomized, double-blind, placebo-controlled trial involving 30 obese women.
• Intervention groups received either 16 g/day ITF or maltodextrin.
• Fecal Bifidobacterium spp. analyzed by PCR-DGGE and q-PCR; SCFA profile by gas chromatography.

Main Results:

• ITF supplementation significantly increased Bifidobacterium longum, B. pseudocatenulatum, and B. adolescentis (p < 0.01).
• B. longum showed a negative correlation with serum lipopolysaccharide (LPS) endotoxin (p < 0.01).
• Total SCFA, acetate, and propionate were significantly lower in the ITF group compared to placebo (p < 0.05).

Conclusions:

• ITF selectively modulates Bifidobacterium species in obese women.
• ITF consumption leads to decreased fecal SCFA concentrations.
• ITF may mitigate metabolic risk factors associated with elevated fecal SCFA in obese individuals.