Effects of gradual weight loss v. rapid weight loss on body composition and RMR: A systematic review and meta-analysis

Damoon Ashtary-Larky, Reza Bagheri, Amir Abbasnezhad, Grant M. Tinsley, Meysam Alipour, Alexei Wong

Research output: Contribution to journalReview articlepeer-review

7 Scopus citations


This systematic review and meta-analysis compared the effects of different rates of weight loss (WL), but equivalent total WL, on body composition and RMR. Studies examining gradual v. rapid WL on body composition and RMR in participants with overweight/obesity published up to October 2019 were identified through PubMed, the Cochrane Library, Web of Science, Embase, Scopus and Ovid databases. Meta-analysis was carried out using a fixed or random effects model as appropriate. Although the magnitude of WL was similar (mean difference 0·03 kg, 95 % CI -0·65, 0·71), gradual WL promoted greater reductions in fat mass (FM) (-1 kg, 95 % CI -1·70, -0·29) and body fat percentage (BFP) (-0·83 %, 95 % CI -1·49, -0·17). Gradual WL significantly preserved RMR compared with rapid WL (407·48 kJ, 95 % CI 76·76, 118·01). However, there was no significant difference in waist and hip circumferences, waist:hip ratio and fat-free mass (FFM) between gradual and rapid WL. The present systematic review and meta-analysis indicates beneficial effects of gradual WL, as compared with rapid WL, on FM, BFP and RMR in individuals with overweight/obesity. However, FFM changes and anthropometric indices did not significantly differ following different rates of WL.

Original languageEnglish
Pages (from-to)1121-1132
Number of pages12
JournalBritish Journal of Nutrition
Issue number11
StatePublished - Dec 14 2020


  • Body composition
  • Diet
  • Fat mass
  • Fat-free mass
  • Obesity
  • RMR
  • Weight loss


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