Life sciences · Observational Study
ClinicalTrials.gov · October 9, 2026
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Observational Study.
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Registry record from ClinicalTrials.gov (NCT05120908). This is a study registration, not published results. Lead sponsor: University of California, Los Angeles. Recruitment status: COMPLETED. Study type: OBSERVATIONAL. Enrollment: 266 participants (ACTUAL). Conditions: Discrimination, Racial, Social Isolation, Stress. Primary outcome measures: Multimodal Brain Signatures , Measured once at Visit 2. Scan lasts about 1.5 hour.; Microbiome - Stool , Collected twice by the participant at home between Visit 1 and Visit 2, lasting no more than 2 weeks after the first appointment.; Microbiome - Blood , Collected once at Day1.. Brief summary: Obesity is a major public health problem related to a variety of illnesses such as heart disease and diabetes. Prior research indicates that social stressors contribute to risk for obesity, possibly through alterations in diet and physical activity. However, it is not fully clear how these alterations contribute to obesity. The purpose of this study is to examine how the stressors of social isolation and discrimination relate to eating behaviors and dietary patterns, and further, how these behaviors affect the brain-gut-microbiome (BGM) connections. This study will focus on Mexican and Filipina women because research shows that they encounter a high burden of obesity and exposure to social stressors. Approximately 300 Mexican and Filipina women will be screened and enrolled. They will then provide information about social stressors via food diaries, physical body measures (e.g. waist circumference), questionnaire data regarding diet and eating behaviors, and measures of physical activity. Stool and serum will be collected to analyze microbes and metabolomics, and MRI to assess brain changes in the reward network. Analytic techniques will be used to integrate data from these multiple data sources. This analysis will determine the unique differences associated with ethnicity and social stressors in moderating eating behaviors and dietary patterns. The results of this study will provide new information about a possible pathway whereby social stressors affect behavioral, neurological and microbiome mechanisms related to obesity risk and provide new information in BGM patterns in two understudied ethnic groups. In the long term, this research may suggest possible approaches for intervention that may help reduce inequalities in obesity and related health problems.