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Should we recommend low-fat diets for obesity?
S Pirozzo1, C Summerbell, C Cameron
1School of Population Health, University of Queensland, Brisbane, Australia.
Summary
Low-fat diets are as effective as other weight-reducing diets for sustained weight loss in overweight or obese individuals. However, the overall weight loss achieved is minimal, suggesting limited long-term efficacy for this approach.
Area of Science:
- Nutrition Science
- Obesity Research
- Dietary Interventions
Background:
- Dietary fat intake is widely associated with increased adiposity, prompting global efforts to reduce fat consumption.
- While short-term studies show low-fat diets promote weight loss, their long-term comparative effectiveness against other dietary restrictions remains unclear.
Purpose of the Study:
- To systematically review the effectiveness of low-fat diets for achieving sustained weight loss in overweight or obese individuals.
- To compare the efficacy of low-fat diets against alternative weight-reducing diets over a minimum 6-month follow-up period.
Main Methods:
- A systematic review of randomized controlled trials (RCTs) involving overweight or obese adults (≥18 years, no serious disease).
- Included studies compared low-fat diets with other weight-reducing diets, with follow-up durations ranging from 6 to 18 months.
- Six RCTs with a total of 594 participants met the inclusion criteria.
Main Results:
- No significant differences were found in sustained weight loss between low-fat diets and other weight-reducing diets.
- The overall weight loss observed at 12-18 month follow-up across all studies was modest, ranging from 2 to 4 kg.
Conclusions:
- Low-fat diets demonstrate comparable efficacy to other weight-reducing diets for sustained weight loss in overweight and obese individuals.
- The minimal overall weight loss suggests that low-fat diets alone may not be a highly effective strategy for significant long-term weight management.