No effect of dietary calcium on body weight of lean and obese mice and rats.
Recent epidemiological and animal studies have led to the hypothesis that low dietary calcium intakes contribute to obesity. Here, we evaluated whether calcium influenced the body weight of normal-weight and obese rodents. All experiments involved female C57BL/6J mice or Sprague-Dawley rats fed normal- or high-energy-density diets (3.8 o 4.7 kcal/g). Calcium intake was manipulated by allowing mice to drink sweetened 30 mM CaCl(2) solution or feeding mice and rats diets differing in calcium content (0.2%, 0.6%, o 1.8% Ca(2+)). Blood samples were taken from rats to confirm that the diets had their intended effects on metabolism. There were no effects of the calcium manipulations on energy intake, body weight, or carcass fat content and no simple elation between calciotropic hormones and body weight. One experiment found a significant decrease in body weight gain of lean and obese rats fed the 1.8% Ca(2+) diet, but we suspect that this was due to forced consumption of the unpalatable diet, reducing growth. These studies provide little support for the hypothesis that dietary calcium contributes to the etiology or maintenance of obesity.
Zhang
Qinmin
Q
Monell Chemical Senses Center, 3500 Market St., Philadelphia, PA 19104, USA.
Tordoff
Michael G
MG
D000818:Animals; D001823:Body Composition / Q000502:physiology; D001835:Body Weight / Q000187:drug effects*; D001842:Bone and Bones / Q000378:metabolism; D002122:Calcium Chloride / Q000494:pharmacology; D002136:Calcium, Dietary / Q000494:pharmacology*; D004032:Diet; D004435:Eating / Q000187:drug effects; D004734:Energy Metabolism / Q000187:drug effects; D005260:Female; D005269:Femur / Q000378:metabolism; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009765:Obesity / Q000503:physiopathology*; D010281:Parathyroid Hormone / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D015430:Weight Gain / Q000187:drug effects
D002136:Calcium, Dietary; D010281:Parathyroid Hormone; D002122:Calcium Chloride