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Long-term weight loss after diet and exercise: a systematic review

International Journal of Obesity volume 29, pages 1168–1174 (2005)Cite this article

Abstract

OBJECTIVE:

To assess the effectiveness of dietary interventions and exercise in long-term weight loss in overweight and obese people.

DESIGN:

A systematic review with meta-analysis.

SUBJECTS:

Overweight and obese adults—18 years old or older with body mass index (calculated as weight divided by the square of height in meters)>25.

DATA SOURCE:

Medline, Cochrane Library and Lilacs databases up to March 2003. Also, published reviews and all relevant studies and their reference lists were reviewed in search for other pertinent publications. No language restrictions were imposed.

STUDY SELECTION:

Randomised clinical trials comparing diet and exercise interventions vs diet alone. All trials included a follow-up of 1 y after intervention.

DATA EXTRACTION:

Two reviewers independently abstracted data and evaluated the studies’ quality with criteria adapted from the Jadad Scale and the Delphi list.

DATA SYNTHESIS:

The estimate of the intervention's effect size was based on the differences between the comparison groups, and then the overall effect was calculated. A chi-squared test was used to assess statistical heterogeneity.

RESULTS:

A total of 33 trials evaluating diet, exercise or diet and exercise were found. Only 6 studies directly comparing diet and exercise vs diet alone were included (3 additional studies reporting repeated observations were excluded). The active intervention period ranged between 10 and 52 weeks across studies. Diet associated with exercise produced a 20% greater initial weight loss. (13 kg vs 9.9 kg; z=1.86—p=0.063, 95%CI). The combined intervention also resulted in a 20% greater sustained weight loss after 1 y (6.7 kg vs 4.5 kg; z=1.89—p=0.058, 95%CI) than diet alone. In both groups, almost half of the initial weight loss was regained after 1 y.

CONCLUSION:

Diet associated with exercise results in significant and clinically meaningful initial weight loss. This is partially sustained after 1 y.

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Acknowledgements

The authors thank: Rosely Sichieri, MD, PhD, Instituto de Medicina Social—Universidade do Estado do Rio de Janeiro; and Charles André, MD, PhD, Universidade Federal do Rio de Janeiro for valuable suggestions.

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  1. Instituto de Medicina Social, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil

    C C Curioni & P M Lourenço

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Correspondence to C C Curioni.

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Curioni, C., Lourenço, P. Long-term weight loss after diet and exercise: a systematic review. Int J Obes 29, 1168–1174 (2005). https://doi.org/10.1038/sj.ijo.0803015

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