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Fat in Weight Loss Diet
Fat-Restrictive Diets No Better Than Calorie-Restrictive Plans for Long Term Weight Loss
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Fat in Weight Loss Diet - Study - Part 2

For Part 1, see Fat & Weight Loss Diets

Weight Loss Diets Study - Results
Four studies were included at the six month follow-up, five studies at the 12 month follow-up and three studies at the 18 month follow-up. There was no significant difference in weight loss between the two groups at six months (WMD 1.7 kg, 95 percent CI -1.4 to 4.8 kg). The weighted sum of weight loss in the low fat group was -5.08 kg (95 percent CI -5.9 to -4.3 kg) and in the control group was -6.5 kg, (95 percent CI -7.3 to -5.7 kg). There was no significant difference in weight loss between the two groups at 12 months (WMD 1.1 kg, 95 percent CI -1.6 to 3.8 kg). The weighted sum of weight loss in the low fat group was -2.3 kg (95 percent CI -3.2 to -1.4 kg) and in the control group was -3.4 kg (95 percent CI -4.2 to -2.6 kg). There was no significant difference in weight loss between the two groups at 18 months (WMD 3.7 kg, 95 percent CI - 1.8 to 9.2). The weighted sum of weight loss in the control group was -2.3 kg (95 percent CI -3.5 to -1.2 kg) and in the low fat group there was a weight gain of 0.1 kg (95 percent CI -0.8 to 1 kg). There was significant heterogeneity in the results for weight loss at six months and 12 months. Apart from one study which showed a slight but statistically significant difference in total cholesterol in the low fat group at one year follow-up, there were no significant differences between the dietary groups for other outcome measures such as serum lipids, blood pressure and fasting plasma glucose. Studies measuring other factors such as perceived wellness and quality of life reported conflicting results.

Weight Loss Diets Study - Conclusions
The review suggests that fat-restricted diets are no better than calorie restricted diets in achieving long term weight loss in overweight or obese people. Overall, participants lost slightly more weight on the control diets but this was not significantly different from the weight loss achieved through dietary fat restriction and was so small as to be clinically insignificant.

Source: Pirozzo S, Summerbell C, Cameron C, Glasziou P. School of Population Health, University of Queensland, Herston Rd, Herston, Queensland, Australia, 4006. 2002

Weight Loss & Obesity Reduction
The science of weight loss and weight management is constantly evolving, along with research into diet modification, types of gastrointestinal weight loss surgery and weight loss drugs. At present, however, a balanced diet plan combined with a regular fitness program remains the favored weight control strategy of most weight loss experts.

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