Dietary inflammatory potential and its impact on gut microbiota in patients with mild cognitive impairment

Area of Science:

• Microbiology
• Neuroscience
• Nutrition Science

Background:

• Diet significantly influences systemic inflammation and gut microbiota composition.
• Gut dysbiosis and inflammation are implicated in the development of cognitive impairment.
• Understanding the diet-microbiota-cognition axis is crucial for managing mild cognitive impairment (MCI).

Purpose of the Study:

• To investigate the impact of dietary inflammation on gut microbiota in MCI patients.
• To explore the relationship between specific gut microbes and cognitive function in MCI.
• To assess the association between dietary inflammatory index and cognitive performance.

Main Methods:

• Utilized the energy-adjusted dietary inflammatory index (E-DII) to quantify dietary inflammation.
• Analyzed gut microbial composition using 16S rRNA gene sequencing in MCI patients.
• Correlated microbial abundances and diversity with cognitive test scores (MoCA, AVLT-LR, STT-A).

Main Results:

• No significant differences in gut microbial diversity were found across E-DII groups.
• Anti-inflammatory diets were associated with higher abundances of *Christensenella* and *Oribacterium*.
• Pro-inflammatory diets correlated with increased prevalence of *Streptococcus*, *Ruthenibacterium*, *Enterobacter*, and *Conservatibacter*.
• Specific oral and gut microbial genera were significantly associated with cognitive scores.
• Higher E-DII scores were linked to poorer overall cognitive function, including deficits in language, attention, and executive function.

Conclusions:

• Dietary patterns, particularly inflammatory diets, are associated with distinct gut microbial profiles in MCI patients.
• Specific gut microbial compositions are linked to cognitive performance in individuals with MCI.
• Targeting gut microbiota through dietary interventions may offer a novel strategy for managing cognitive decline.