The BIOCARD framework, an exploratory fecal multi-omics platform integrating bile acids, lipids, and metabolites, revealed intervention-associated molecular differences that traditional clinical indicators failed to detect in a 10-week garden-based cardiovascular health intervention.
Key Findings
Results
Traditional clinical indicators showed limited sensitivity for detecting intervention-related differences between the garden-based intervention group and the education-only control group.
The study compared a multicomponent garden-based intervention (SHA) with an education-only control group (MSP) over 10 weeks.
Conventional clinical and behavioral indicators were evaluated alongside fecal multi-omics measures.
The limited sensitivity of traditional indicators motivated development of the BIOCARD framework as a complementary molecular approach.
The trial was a randomized controlled trial involving caregiver-child participant pairs.
Results
Fecal multi-omics analyses revealed intervention-associated differences in metabolites, lipids, and bile acids between the SHA and MSP groups.
Fecal polar metabolites, lipids, and bile acids were analyzed using UHPLC-HRMS-based approaches.
The BIOCARD (Bile acids, lIpids, and mOleCules for cARDiovascular health) framework integrated all three omics layers.
Differences were detected in all three molecular classes: fecal metabolites, lipids, and bile acids.
These molecular differences were not captured by conventional clinical indicators.
Results
Children showed more apparent molecular variation in response to the intervention than their parent caregivers.
The study enrolled caregiver-child participant pairs, allowing comparison of molecular responses across age groups.
Children demonstrated greater intervention-associated molecular differences across the fecal multi-omics measures.
This finding suggests differential responsiveness to the nutritional intervention by age group at the molecular level.
The study design linking caregivers and children allowed for this within-household comparison.
Results
Network analysis revealed associations between selected fecal molecular features and cardiovascular-related indicators including blood pressure, body fat, skin carotenoids, and Healthy Eating Index scores.
Network analysis was used to integrate fecal multi-omics data with conventional health indicators.
Cardiovascular-related indicators examined included blood pressure, body fat percentage, skin carotenoids, and Healthy Eating Index (HEI) scores.
Skin carotenoids were included as a marker relevant to fruit and vegetable intake, consistent with the garden-based intervention focus.
These associations support the biological relevance of the BIOCARD molecular features to cardiovascular health outcomes.
Methods
The BIOCARD framework was developed as an exploratory fecal multi-omics platform integrating three complementary analytical approaches to evaluate cardiovascular nutritional intervention outcomes.
BIOCARD stands for Bile acids, lIpids, and mOleCules for cARDiovascular health assessment.
The platform integrates fecal bile acids, lipids, and polar metabolites analyzed by UHPLC-HRMS-based approaches.
Fecal samples were collected from participants in a 10-week randomized controlled trial.
The framework was designed to complement, not replace, traditional outcome measures for nutritional intervention evaluation.
The study focused on an under-resourced population, a group highlighted as particularly affected by CVD morbidity and mortality.
What This Means
This research developed a new analytical framework called BIOCARD to better measure how a healthy eating intervention affects the body at a molecular level. The study enrolled caregiver-child pairs in a 10-week program that compared a garden-based intervention (growing and eating produce) to an education-only group. Instead of relying only on traditional health measurements like blood pressure or body weight, researchers analyzed participants' stool samples to measure three types of molecules: bile acids (which help digest fats), lipids (fats), and other metabolites (small chemical byproducts of body processes). This approach was applied to participants from under-resourced communities, who face disproportionately high rates of cardiovascular disease.
This research suggests that the molecular measurements in stool captured differences between the intervention and control groups that standard clinical tests missed. Notably, children's molecular profiles changed more visibly than those of their adult caregivers in response to the intervention. Additionally, when researchers mapped out connections between these molecular features and health indicators, they found meaningful links to blood pressure, body fat, skin carotenoid levels (a marker of fruit and vegetable consumption), and diet quality scores.
The practical implication of this work is that analyzing stool samples for multiple types of molecules simultaneously may provide a more sensitive early window into how nutritional programs affect cardiovascular health, especially in populations where traditional clinical markers may not yet show detectable changes. This research suggests that fecal multi-omics analysis could serve as a valuable complement to conventional health measurements when evaluating diet-based interventions, and that children may be a particularly informative group to study when assessing early biological responses to dietary changes.
Zhang H, Chen L, Xu R, Jung H, Gao S, Khalsa A, et al.. (2026). BIOCARD framework: integrating fecal bile acids, lipids, and metabolites to assess response to a cardiovascular health intervention.. Gut microbes. https://doi.org/10.1080/19490976.2026.2719242