Evaluation of metabolism‐boosting beverages on resting energy expenditure

Abstract

Objective: To evaluate the effect of thermogenic meal replacement beverages (TMRB) containing 90mg ECGC and 100mg of caffeine on resting energy expenditure (REE).Subjects: 30 adults (19 women, 11 men) were stratified into 3 groups: lean (n=10, BMI 21.5 ± 2.1); overweight/obese (OW) (n=10, BMI 29.8 ± 2.7); or weight maintainers (WM) (n=10, BMI 28.8 ± 4.0, maintained wt loss of ≥5% body wt for ≥3 mos).Methods: Following an overnight fast, baseline measures of ht, wt, WC, bp, pulse, and REE via indirect calorimetry were performed. REE was repeated at 30, 60, 90, and 120 min after consuming a TMRB. Appetite was assessed via visual analogue scale at baseline, 30 min and 120 min after consuming the TMRB.Results: Overall, mean REE increased 24.0 ± 10.1% for the 2‐hr period following the consumption of a TMRB. Mean 24‐hr REE was increased 5.9 ± 2.5% overall (p=0.000), 5.7 ± 3.1% among lean subjects (p=0.0002), 5.3 ± 1.4% among OW subjects (p=0.000), and 6.8 ± 2.7% among WM (p=0.0007). There was a trend toward increased fat oxidation (p=0.116). Appetite was significantly reduced 30 min after consuming the TMRB (p=0.0002), but not at 120 min.Conclusion: Our findings suggest 3 potential benefits of TMRB in weight control: increases in resting energy expenditure, increases in fat oxidation, and decreases in appetite. Decreases in energy in and increases in energy out should translate into improved weight loss and weight maintenance.