According to Statistics Canada ( 2) 48% of Canadians between the ages of 20 and 64 yr are overweight. OBESITY IS THE most common metabolic condition in industrialized nations and is reaching epidemic proportions in North American men, women, and children ( 1). These data suggest that energy restriction achieved by a very LC diet is equally effective as a LF diet strategy for weight loss and decreasing body fat in overweight and obese adults. Blood β-hydroxybutyrate concentrations were increased in the LC only, at the 2- and 4-wk time points.
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Group results indicated that the diets were equally effective in reducing systolic blood pressure by about 10 mm Hg and diastolic pressure by 5 mm Hg and decreasing plasminogen activator inhibitor-1 bioactivity. The LF group better preserved lean body mass when compared with the LC group however, only the LC group had a significant decrease in circulating insulin concentrations. LF subjects lost an average of 6.8 kg and had a decrease in body mass index of 2.2 kg/m 2, compared with a loss of 7.0 kg and decrease in body mass index of 2.1 kg/m 2 in the LC subjects. Both groups of subjects had significant weight loss over the 10 wk of diet intervention and nearly identical improvements in body weight and fat mass. Subjects on the LC diet consumed an average of 15.4% carbohydrate, compared with habitual intakes of about 50% carbohydrate, and had a resulting energy restriction of 3195 kJ/d. Subjects on the LF diet consumed an average of 17.8% of energy from fat, compared with their habitual intake of 36.4%, and had a resulting energy restriction of 2540 kJ/d. Thirty-one subjects completed all 10 wk of the diet intervention (retention, 78%). a low-carbohydrate (LC) diet on weight loss. Overweight and obese men and women (24–61 yr of age) were recruited into a randomized trial to compare the effects of a low-fat (LF) vs.