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  • Title: A high calcium, skim milk powder diet results in a lower fat mass in male, energy-restricted, obese rats more than a low calcium, casein, or soy protein diet.
    Author: Eller LK, Reimer RA.
    Journal: J Nutr; 2010 Jul; 140(7):1234-41. PubMed ID: 20463146.
    Abstract:
    The combination of dairy protein and dietary calcium (Ca) may enhance weight loss more effectively than either compound alone. Our purpose in this study was to determine the effect of various protein sources [skim milk powder (SMP), whey, casein, and soy protein isolate (SPI)] and 2 levels of Ca [low, 0.67% Ca (LC) or high, 2.4% Ca (HC)] on weight loss. Sixty-four 12-wk-old Sprague-Dawley, diet-induced obese rats were assigned to 1 of 8 energy-restricted (ER) diets for 4 wk with 1 of the 4 protein sources and either LC or HC concentrations. Rats were ER to 70% of the ad libitum food and energy intake of a reference group (n = 8) fed the AIN-93M diet. The interaction between dietary protein and Ca affected final body weight and fat mass (FM) (P < 0.05). FM was less in rats fed SMP-HC than in those fed casein-LC or SPI-LC. Lean body mass was greater in rats fed SMP than in those fed whey. Rats fed HC diets had a lower plasma glucagon area under the curve (AUC) than those fed LC diets. The blood glucose AUC, homeostatic model of insulin resistance, and the expression of certain hepatic genes involved in energy metabolism were affected by protein and Ca. These data suggest that consuming a diet containing SMP and HC is associated with a lower FM in obese, male, ER rats than in diets containing casein or SPI and LC; however, the role of SMP and Ca in glucose homeostasis remains to be determined.
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