title: Comparison of the effects of three different (-)-hydroxycitric acid preparations on food intake in rats.
abstract: BACKGROUND
  Studies on the effects of (-)-hydroxycitric acid (HCA) in humans are controversial. As differences in the HCA preparations may contribute to this apparent discrepancy, the aim of the current study is to compare different HCA-containing preparations in adult Wistar rats.
  
  
  METHODS
  The effects of 3 different HCA-containing preparations (Regulator, Citrin K, Super CitriMax HCA-600-SXS, all used at an effective HCA dose of 150 and 300 mg/kg, administered intragastrically) on food intake and body weight were studied in adult male Wistar rats. The efficacy was tested under 2 different experimental conditions: 1) after a single dose administration and 2) during repeated administration for 4 subsequent days.
  
  
  RESULTS
  Regulator and Citrin K significantly reduced food intake in both experimental setups, while Super CitriMax HCA-600-SXS was less effective. When administered for 4 subsequent days Regulator and Citrin K diminished body weight gain.
  
  
  CONCLUSIONS
  Regulator and Citrin K were shown to be potent inhibitors of food intake in rats, whereas Super CitriMax HCA-600-SXS showed only small and more inconsistent effects. The striking differences in efficacy between these 3 preparations indicate that low doses of a relatively low-effective HCA preparation may have contributed to the lack of efficacy as found in several human studies.
authors.affiliation: Department of BioMedical Research, Numico Research, 6700 CA Wageningen, The Netherlands. johanna.loutervandehaar@numico-research.nl
authors.forename: Johanna
authors.initials: J
authors.lastname: Louter-van de Haar
authors.forename: Peter Y
authors.initials: PY
authors.lastname: Wielinga
authors.forename: Anton J W
authors.initials: AJ
authors.lastname: Scheurink
authors.forename: Arie G
authors.initials: AG
authors.lastname: Nieuwenhuizen