Body Mass Index Modifies Associations Between Diet Quality and Circulating Metabolites: The CARDIA Study, 2005...

Area of Science:

• Metabolomics
• Nutritional Science
• Obesity Research

Background:

• Obesity significantly alters metabolism, leading to varied diet-disease links.
• Understanding how obesity affects metabolic pathways is crucial for targeted interventions.
• Metabolic pathway differences related to obesity status remain largely unclear.

Purpose of the Study:

• To investigate if cross-sectional associations between metabolites and diet quality vary by obesity status.
• To identify specific metabolic pathways affected by body mass index (BMI).
• To assess the influence of obesity on diet-metabolite relationships.

Main Methods:

• Utilized untargeted metabolomics on 7255 metabolite peaks from 2832 participants.
• Employed an a priori diet quality score (APDQS) and stratified analyses by BMI.
• Applied linear regression and pathway enrichment analyses to identify differential associations and metabolic activity.

Main Results:

• Metabolite associations with diet quality were strongest in participants without overweight or obesity.
• 180 metabolite peaks showed associations with APDQS that differed by BMI.
• Six key metabolic pathways, including bile acid and steroid biosynthesis, exhibited differential activity based on BMI.

Conclusions:

• Diet-metabolite associations are more readily detected in individuals with normal weight.
• Obesity is linked to distinct metabolic pathways, suggesting altered metabolic functions.
• These findings point to obesity-related metabolic perturbations impacting diet-metabolite interactions.