The Gut Microbiota during a Behavioral Weight Loss Intervention

Area of Science:

• Microbiome research
• Obesity and metabolic health
• Dietary interventions

Background:

• Altered gut microbiota is associated with obesity.
• Gut microbial composition may influence weight loss efficacy.

Purpose of the Study:

• To investigate the gut microbiota's role in a weight loss trial comparing daily caloric restriction (DCR) and intermittent fasting (IMF).
• To examine baseline and 3-month changes in gut microbiota and their association with obesity-related parameters.
• To identify differences in microbiota response between DCR and IMF groups.

Main Methods:

• Ancillary study within an ongoing weight loss trial.
• Analysis of fecal microbiota composition and diversity at baseline and after three months.
• Correlation of microbiota features with clinical measures (weight, waist circumference) and intervention effects.

Main Results:

• Participants showed significant improvements in clinical health measures.
• Fecal microbiota composition and diversity were altered post-intervention.
• Gut microbiota features were significantly associated with weight and waist circumference, and changes over time.
• The relative abundance of *Akkermansia* differed between DCR and IMF groups.

Conclusions:

• Baseline gut microbiota influences weight loss responsiveness.
• Both DCR and IMF interventions induce early changes in gut microbiota composition and diversity.
• Specific microbial shifts, such as *Akkermansia* abundance, may distinguish between different weight loss strategies.