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In its January 25 2012 issue the Journal of the American Medical Association JAMA reported...

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In its January 25 2012 issue the Journal of the American Medical Association JAMA reported on the effects of overconsumption of low normal and high protein diets on weight gain energy expenditure and body composition Researchers conducted a single blind randomized controlled trial of 25 U S adults All subjects were admitted to the inpatient metabolic unit for the duration of the trial 10 to 12 weeks The subjects were healthy weight stable male and female volunteers aged 18 to 35 years All subjects consumed a weight stabilizing diet for 13 to 25 days Afterwards the researchers randomly assigned participants to diets containing various percentages of energy from protein 5 low protein 15 normal protein or 25 high protein The subjects were not aware of the specific protein level diet to which they were assigned On these diets the researchers overfed the participants during the last 8 weeks of their 10 to 12 week stay in the inpatient metabolic unit Which of the following is used in the design of this experiment Check all that apply Control group O Blinding of subjects Blinding of reserachers O Direct control of confounding variables

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