In this randomized, placebo-controlled trial in subjects with obesity, we implemented multi-parametric MRI including fat fraction (FF), R2*, and T1 values on PET-MRI in both thermoneutral and cold-activated non-shivering thermogenesis conditions to investigate whether brown adipose tissue property changes measured by MRI can reflect its activation secondary to cold-activated stimulation and chronic capsinoids ingestion before and after weight loss. In subjects taking capsinoids, FF decreased and R2* increased significantly after weight loss as compared with baseline, and these changes were significantly larger than the changes seen after weight loss in the group taking placebo.
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