title: The Acute Effects of Nonstimulant Over-the-Counter Dietary Herbal Supplements on Resting Metabolic Rate.
abstract: BACKGROUND
  Weight loss supplements are widely advertised and highly sought out products. Many supplements claim to increase body fat utilization, increase resting metabolic rate (RMR), and to improve body composition by decreasing total body fat composition. Therefore, the purpose of this study was to determine the acute effect of nonstimulant herbal supplements on RMR and substrate utilization.
  
  
  METHODS
  Ten female and 16 male participants (mean age 23.7 ± 3.9 years; mean weight 79.2 ± 18.2 kg) completed a random-repeated measures crossover study. Participants completed a total of three RMRs by either ingesting a placebo (P) or one of two supplements [raspberry ketones (R) or metabolic activator blend (MAB)] 2 hours prior to testing.
  
  
  RESULTS
  No significant difference was found for RMR for P vs. MAB (p = .130), vs. R (p = .588), and MAB vs. R (p = .636). No significant difference was found for respiratory quotient for P vs. MAB (p = .056), vs. R (p = .149), and MAB vs. R (p = .764). No significant difference was found for substrate utilization: percent carbohydrate utilization, P vs. MAB (p = .052), P vs. R (p = .124), and MAB vs. R (p = .680); and percent fat utilization, P vs. MAB (p = .052), P vs. R (p = .120), and MAB vs. R (p = .749).
  
  
  CONCLUSIONS
  Therefore, nonstimulant weight loss supplements may not be beneficial for weight loss, or an increase of fat utilization.
authors: a Department of Kinesiology and Physical Education , Northern Illinois University , DeKalb , IL , USA.
authors: Amanda J
authors: AJ
authors: Salacinski
authors: a Department of Kinesiology and Physical Education , Northern Illinois University , DeKalb , IL , USA.
authors: Steven M
authors: SM
authors: Howell
authors: a Department of Kinesiology and Physical Education , Northern Illinois University , DeKalb , IL , USA.
authors: Danielle L
authors: DL
authors: Hill
authors: a Department of Kinesiology and Physical Education , Northern Illinois University , DeKalb , IL , USA.
authors: Steven M
authors: SM
authors: Mauk
mesh_terms: D000328:Adult; D001481:Basal Metabolism / Q000187:drug effects*; D001823:Body Composition / Q000187:drug effects; D015992:Body Mass Index; D018592:Cross-Over Studies; D019587:Dietary Supplements; D005260:Female; D006801:Humans; D008297:Male; D009765:Obesity / Q000188:drug therapy; D028321:Plant Preparations / Q000494:pharmacology*; D015431:Weight Loss; D055815:Young Adult
chemical_list: D028321:Plant Preparations
keywords: herbal supplements; metabolic rate; weight loss