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1Division of Geriatrics and Nutritional Sciences, 2Center for Human Nutrition, 3Division of Biostatistics, Washington University School of Medicine, St. Louis, Missouri; and 4Division of Food Science, Human Nutrition and Health, Istituto Superiore di Sanitá, Rome, Italy
Submitted 14 February 2007 ; accepted in final form 20 March 2007
Coronary heart disease (CHD) risk factors and the risk of CHD increase with increased adiposity. Fat loss induced by negative energy balance improves all metabolic CHD risk factors. To determine whether fat loss induced by long-term calorie restriction (CR) or increased energy expenditure induced by exercise (EX) has different effects on CHD risk factors in nonobese subjects, we conducted a 1-yr controlled trial involving 48 nonobese subjects who were randomly assigned to one of three groups: CR, 20% CR diet (n = 18); EX, 20% increase in energy expenditure through daily exercise with no increase in energy intake (n = 18); or HL, healthy lifestyle guidelines (n = 10). Subjects were 29 women and 17 men aged 57 ± 3 yr, with BMI 27.3 ± 2.0 kg/m2. Assessments included total body fat by DEXA, lipoproteins, blood pressure, HOMA-IR, C-reactive protein (CRP), and estimated 10-yr CHD risk score. Body fat decreased by 6.3 ± 3.8 kg in CR, 5.6 ± 4.4 kg in EX, and 0.4 ± 1.7 kg in HL, which corresponded to reductions of 24.9, 22.3, and 1.2% of baseline body fat mass, respectively. These CR- and EX-induced energy deficits were accompanied by reductions in most of the major CHD risk factors, including plasma LDL-cholesterol, total cholesterol/HDL ratio, HOMA-IR index, and CRP concentrations that were similar in the two intervention groups. Data from the present study provide evidence that CR- and EX-induced negative energy balance result in substantial and similar improvements in the major risk factors for CHD in normal-weight and overweight middle-aged adults.
cholesterol; C-reactive protein; insulin resistance
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