Intentional Weight Loss and All-Cause Mortality: A Meta-Analysis of Randomized Clinical Trials

Obesity is associated with increased mortality, and weight loss trials show rapid improvement in many mortality risk factors. Yet, observational studies typically associate weight loss with higher mortality risk. The purpose of this meta-analysis of randomized controlled trials (RCTs) of weight loss...

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Published inPloS one Vol. 10; no. 3; p. e0121993
Main Authors Kritchevsky, Stephen B., Beavers, Kristen M., Miller, Michael E., Shea, M. Kyla, Houston, Denise K., Kitzman, Dalane W., Nicklas, Barbara J.
Format Journal Article
LanguageEnglish
Published United States Public Library of Science 20.03.2015
Public Library of Science (PLoS)
Subjects
Online AccessGet full text
ISSN1932-6203
1932-6203
DOI10.1371/journal.pone.0121993

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Abstract Obesity is associated with increased mortality, and weight loss trials show rapid improvement in many mortality risk factors. Yet, observational studies typically associate weight loss with higher mortality risk. The purpose of this meta-analysis of randomized controlled trials (RCTs) of weight loss was to clarify the effects of intentional weight loss on mortality. 2,484 abstracts were identified and reviewed in PUBMED, yielding 15 RCTs reporting (1) randomization to weight loss or non-weight loss arms, (2) duration of ≥18 months, and (3) deaths by intervention arm. Weight loss interventions were all lifestyle-based. Relative risks (RR) and 95% confidence intervals (95% CI) were estimated for each trial. For trials reporting at least one death (n = 12), a summary estimate was calculated using the Mantel-Haenszel method. Sensitivity analysis using sparse data methods included remaining trials. Trials enrolled 17,186 participants (53% female, mean age at randomization = 52 years). Mean body mass indices ranged from 30-46 kg/m2, follow-up times ranged from 18 months to 12.6 years (mean: 27 months), and average weight loss in reported trials was 5.5±4.0 kg. A total of 264 deaths were reported in weight loss groups and 310 in non-weight loss groups. The weight loss groups experienced a 15% lower all-cause mortality risk (RR = 0.85; 95% CI: 0.73-1.00). There was no evidence for heterogeneity of effect (Cochran's Q = 5.59 (11 d.f.; p = 0.90); I2 = 0). Results were similar in trials with a mean age at randomization ≥55 years (RR = 0.84; 95% CI 0.71-0.99) and a follow-up time of ≥4 years (RR = 0.85; 95% CI 0.72-1.00). In obese adults, intentional weight loss may be associated with approximately a 15% reduction in all-cause mortality.
AbstractList Background Obesity is associated with increased mortality, and weight loss trials show rapid improvement in many mortality risk factors. Yet, observational studies typically associate weight loss with higher mortality risk. The purpose of this meta-analysis of randomized controlled trials (RCTs) of weight loss was to clarify the effects of intentional weight loss on mortality. Methods 2,484 abstracts were identified and reviewed in PUBMED, yielding 15 RCTs reporting (1) randomization to weight loss or non-weight loss arms, (2) duration of ≥18 months, and (3) deaths by intervention arm. Weight loss interventions were all lifestyle-based. Relative risks (RR) and 95% confidence intervals (95% CI) were estimated for each trial. For trials reporting at least one death (n = 12), a summary estimate was calculated using the Mantel-Haenszel method. Sensitivity analysis using sparse data methods included remaining trials. Results Trials enrolled 17,186 participants (53% female, mean age at randomization = 52 years). Mean body mass indices ranged from 30–46 kg/m2, follow-up times ranged from 18 months to 12.6 years (mean: 27 months), and average weight loss in reported trials was 5.5±4.0 kg. A total of 264 deaths were reported in weight loss groups and 310 in non-weight loss groups. The weight loss groups experienced a 15% lower all-cause mortality risk (RR = 0.85; 95% CI: 0.73–1.00). There was no evidence for heterogeneity of effect (Cochran’s Q = 5.59 (11 d.f.; p = 0.90); I2 = 0). Results were similar in trials with a mean age at randomization ≥55 years (RR = 0.84; 95% CI 0.71–0.99) and a follow-up time of ≥4 years (RR = 0.85; 95% CI 0.72–1.00). Conclusions In obese adults, intentional weight loss may be associated with approximately a 15% reduction in all-cause mortality.
Background Obesity is associated with increased mortality, and weight loss trials show rapid improvement in many mortality risk factors. Yet, observational studies typically associate weight loss with higher mortality risk. The purpose of this meta-analysis of randomized controlled trials (RCTs) of weight loss was to clarify the effects of intentional weight loss on mortality. Methods 2,484 abstracts were identified and reviewed in PUBMED, yielding 15 RCTs reporting (1) randomization to weight loss or non-weight loss arms, (2) duration of ≥18 months, and (3) deaths by intervention arm. Weight loss interventions were all lifestyle-based. Relative risks (RR) and 95% confidence intervals (95% CI) were estimated for each trial. For trials reporting at least one death (n = 12), a summary estimate was calculated using the Mantel-Haenszel method. Sensitivity analysis using sparse data methods included remaining trials. Results Trials enrolled 17,186 participants (53% female, mean age at randomization = 52 years). Mean body mass indices ranged from 30–46 kg/m 2 , follow-up times ranged from 18 months to 12.6 years (mean: 27 months), and average weight loss in reported trials was 5.5±4.0 kg. A total of 264 deaths were reported in weight loss groups and 310 in non-weight loss groups. The weight loss groups experienced a 15% lower all-cause mortality risk (RR = 0.85; 95% CI: 0.73–1.00). There was no evidence for heterogeneity of effect (Cochran’s Q = 5.59 (11 d.f.; p = 0.90); I 2 = 0). Results were similar in trials with a mean age at randomization ≥55 years (RR = 0.84; 95% CI 0.71–0.99) and a follow-up time of ≥4 years (RR = 0.85; 95% CI 0.72–1.00). Conclusions In obese adults, intentional weight loss may be associated with approximately a 15% reduction in all-cause mortality.
Obesity is associated with increased mortality, and weight loss trials show rapid improvement in many mortality risk factors. Yet, observational studies typically associate weight loss with higher mortality risk. The purpose of this meta-analysis of randomized controlled trials (RCTs) of weight loss was to clarify the effects of intentional weight loss on mortality. 2,484 abstracts were identified and reviewed in PUBMED, yielding15 RCTs reporting (1) randomization to weight loss or non-weight loss arms, (2) duration of [greater than or equal to]18 months, and (3) deaths by intervention arm. Weight loss interventions were all lifestyle-based. Relative risks (RR) and 95% confidence intervals (95% CI) were estimated for each trial. For trials reporting at least one death (n = 12), a summary estimate was calculated using the Mantel-Haenszel method. Sensitivity analysis using sparse data methods included remaining trials. Trials enrolled 17,186 participants (53% female, mean age at randomization = 52 years). Mean body mass indices ranged from 30-46 kg/m.sup.2, follow-up times ranged from 18 months to 12.6 years (mean: 27 months), and average weight loss in reported trials was 5.5±4.0 kg. A total of 264 deaths were reported in weight loss groups and 310 in non-weight loss groups. The weight loss groups experienced a 15% lower all-cause mortality risk (RR = 0.85; 95% CI: 0.73-1.00). There was no evidence for heterogeneity of effect (Cochran's Q = 5.59 (11 d.f.; p = 0.90); I.sup.2 = 0). Results were similar in trials with a mean age at randomization [greater than or equal to]55 years (RR = 0.84; 95% CI 0.71-0.99) and a follow-up time of [greater than or equal to]4 years (RR = 0.85; 95% CI 0.72-1.00). In obese adults, intentional weight loss may be associated with approximately a 15% reduction in all-cause mortality.
Obesity is associated with increased mortality, and weight loss trials show rapid improvement in many mortality risk factors. Yet, observational studies typically associate weight loss with higher mortality risk. The purpose of this meta-analysis of randomized controlled trials (RCTs) of weight loss was to clarify the effects of intentional weight loss on mortality.BACKGROUNDObesity is associated with increased mortality, and weight loss trials show rapid improvement in many mortality risk factors. Yet, observational studies typically associate weight loss with higher mortality risk. The purpose of this meta-analysis of randomized controlled trials (RCTs) of weight loss was to clarify the effects of intentional weight loss on mortality.2,484 abstracts were identified and reviewed in PUBMED, yielding 15 RCTs reporting (1) randomization to weight loss or non-weight loss arms, (2) duration of ≥18 months, and (3) deaths by intervention arm. Weight loss interventions were all lifestyle-based. Relative risks (RR) and 95% confidence intervals (95% CI) were estimated for each trial. For trials reporting at least one death (n = 12), a summary estimate was calculated using the Mantel-Haenszel method. Sensitivity analysis using sparse data methods included remaining trials.METHODS2,484 abstracts were identified and reviewed in PUBMED, yielding 15 RCTs reporting (1) randomization to weight loss or non-weight loss arms, (2) duration of ≥18 months, and (3) deaths by intervention arm. Weight loss interventions were all lifestyle-based. Relative risks (RR) and 95% confidence intervals (95% CI) were estimated for each trial. For trials reporting at least one death (n = 12), a summary estimate was calculated using the Mantel-Haenszel method. Sensitivity analysis using sparse data methods included remaining trials.Trials enrolled 17,186 participants (53% female, mean age at randomization = 52 years). Mean body mass indices ranged from 30-46 kg/m2, follow-up times ranged from 18 months to 12.6 years (mean: 27 months), and average weight loss in reported trials was 5.5±4.0 kg. A total of 264 deaths were reported in weight loss groups and 310 in non-weight loss groups. The weight loss groups experienced a 15% lower all-cause mortality risk (RR = 0.85; 95% CI: 0.73-1.00). There was no evidence for heterogeneity of effect (Cochran's Q = 5.59 (11 d.f.; p = 0.90); I2 = 0). Results were similar in trials with a mean age at randomization ≥55 years (RR = 0.84; 95% CI 0.71-0.99) and a follow-up time of ≥4 years (RR = 0.85; 95% CI 0.72-1.00).RESULTSTrials enrolled 17,186 participants (53% female, mean age at randomization = 52 years). Mean body mass indices ranged from 30-46 kg/m2, follow-up times ranged from 18 months to 12.6 years (mean: 27 months), and average weight loss in reported trials was 5.5±4.0 kg. A total of 264 deaths were reported in weight loss groups and 310 in non-weight loss groups. The weight loss groups experienced a 15% lower all-cause mortality risk (RR = 0.85; 95% CI: 0.73-1.00). There was no evidence for heterogeneity of effect (Cochran's Q = 5.59 (11 d.f.; p = 0.90); I2 = 0). Results were similar in trials with a mean age at randomization ≥55 years (RR = 0.84; 95% CI 0.71-0.99) and a follow-up time of ≥4 years (RR = 0.85; 95% CI 0.72-1.00).In obese adults, intentional weight loss may be associated with approximately a 15% reduction in all-cause mortality.CONCLUSIONSIn obese adults, intentional weight loss may be associated with approximately a 15% reduction in all-cause mortality.
Obesity is associated with increased mortality, and weight loss trials show rapid improvement in many mortality risk factors. Yet, observational studies typically associate weight loss with higher mortality risk. The purpose of this meta-analysis of randomized controlled trials (RCTs) of weight loss was to clarify the effects of intentional weight loss on mortality.2,484 abstracts were identified and reviewed in PUBMED, yielding 15 RCTs reporting (1) randomization to weight loss or non-weight loss arms, (2) duration of ≥18 months, and (3) deaths by intervention arm. Weight loss interventions were all lifestyle-based. Relative risks (RR) and 95% confidence intervals (95% CI) were estimated for each trial. For trials reporting at least one death (n = 12), a summary estimate was calculated using the Mantel-Haenszel method. Sensitivity analysis using sparse data methods included remaining trials.Trials enrolled 17,186 participants (53% female, mean age at randomization = 52 years). Mean body mass indices ranged from 30-46 kg/m2, follow-up times ranged from 18 months to 12.6 years (mean: 27 months), and average weight loss in reported trials was 5.5±4.0 kg. A total of 264 deaths were reported in weight loss groups and 310 in non-weight loss groups. The weight loss groups experienced a 15% lower all-cause mortality risk (RR = 0.85; 95% CI: 0.73-1.00). There was no evidence for heterogeneity of effect (Cochran's Q = 5.59 (11 d.f.; p = 0.90); I2 = 0). Results were similar in trials with a mean age at randomization ≥55 years (RR = 0.84; 95% CI 0.71-0.99) and a follow-up time of ≥4 years (RR = 0.85; 95% CI 0.72-1.00).In obese adults, intentional weight loss may be associated with approximately a 15% reduction in all-cause mortality.
Background Obesity is associated with increased mortality, and weight loss trials show rapid improvement in many mortality risk factors. Yet, observational studies typically associate weight loss with higher mortality risk. The purpose of this meta-analysis of randomized controlled trials (RCTs) of weight loss was to clarify the effects of intentional weight loss on mortality. Methods 2,484 abstracts were identified and reviewed in PUBMED, yielding15 RCTs reporting (1) randomization to weight loss or non-weight loss arms, (2) duration of [greater than or equal to]18 months, and (3) deaths by intervention arm. Weight loss interventions were all lifestyle-based. Relative risks (RR) and 95% confidence intervals (95% CI) were estimated for each trial. For trials reporting at least one death (n = 12), a summary estimate was calculated using the Mantel-Haenszel method. Sensitivity analysis using sparse data methods included remaining trials. Results Trials enrolled 17,186 participants (53% female, mean age at randomization = 52 years). Mean body mass indices ranged from 30-46 kg/m.sup.2, follow-up times ranged from 18 months to 12.6 years (mean: 27 months), and average weight loss in reported trials was 5.5±4.0 kg. A total of 264 deaths were reported in weight loss groups and 310 in non-weight loss groups. The weight loss groups experienced a 15% lower all-cause mortality risk (RR = 0.85; 95% CI: 0.73-1.00). There was no evidence for heterogeneity of effect (Cochran's Q = 5.59 (11 d.f.; p = 0.90); I.sup.2 = 0). Results were similar in trials with a mean age at randomization [greater than or equal to]55 years (RR = 0.84; 95% CI 0.71-0.99) and a follow-up time of [greater than or equal to]4 years (RR = 0.85; 95% CI 0.72-1.00). Conclusions In obese adults, intentional weight loss may be associated with approximately a 15% reduction in all-cause mortality.
Obesity is associated with increased mortality, and weight loss trials show rapid improvement in many mortality risk factors. Yet, observational studies typically associate weight loss with higher mortality risk. The purpose of this meta-analysis of randomized controlled trials (RCTs) of weight loss was to clarify the effects of intentional weight loss on mortality. 2,484 abstracts were identified and reviewed in PUBMED, yielding 15 RCTs reporting (1) randomization to weight loss or non-weight loss arms, (2) duration of ≥18 months, and (3) deaths by intervention arm. Weight loss interventions were all lifestyle-based. Relative risks (RR) and 95% confidence intervals (95% CI) were estimated for each trial. For trials reporting at least one death (n = 12), a summary estimate was calculated using the Mantel-Haenszel method. Sensitivity analysis using sparse data methods included remaining trials. Trials enrolled 17,186 participants (53% female, mean age at randomization = 52 years). Mean body mass indices ranged from 30-46 kg/m2, follow-up times ranged from 18 months to 12.6 years (mean: 27 months), and average weight loss in reported trials was 5.5±4.0 kg. A total of 264 deaths were reported in weight loss groups and 310 in non-weight loss groups. The weight loss groups experienced a 15% lower all-cause mortality risk (RR = 0.85; 95% CI: 0.73-1.00). There was no evidence for heterogeneity of effect (Cochran's Q = 5.59 (11 d.f.; p = 0.90); I2 = 0). Results were similar in trials with a mean age at randomization ≥55 years (RR = 0.84; 95% CI 0.71-0.99) and a follow-up time of ≥4 years (RR = 0.85; 95% CI 0.72-1.00). In obese adults, intentional weight loss may be associated with approximately a 15% reduction in all-cause mortality.
Audience Academic
Author Miller, Michael E.
Kritchevsky, Stephen B.
Beavers, Kristen M.
Nicklas, Barbara J.
Shea, M. Kyla
Houston, Denise K.
Kitzman, Dalane W.
AuthorAffiliation 3 Department of Biostatistical Sciences, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
1 Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
Providence VA Medical Center and Brown University, UNITED STATES
2 Department of Health and Exercise Science, Wake Forest University, Winston-Salem, NC, United States of America
4 Human Nutrition Research Center on Aging, Tufts University, Boston, MA, United States of America
AuthorAffiliation_xml – name: 1 Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
– name: 3 Department of Biostatistical Sciences, Wake Forest School of Medicine, Winston-Salem, NC, United States of America
– name: 4 Human Nutrition Research Center on Aging, Tufts University, Boston, MA, United States of America
– name: Providence VA Medical Center and Brown University, UNITED STATES
– name: 2 Department of Health and Exercise Science, Wake Forest University, Winston-Salem, NC, United States of America
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  givenname: Stephen B.
  surname: Kritchevsky
  fullname: Kritchevsky, Stephen B.
– sequence: 2
  givenname: Kristen M.
  surname: Beavers
  fullname: Beavers, Kristen M.
– sequence: 3
  givenname: Michael E.
  surname: Miller
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– sequence: 4
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  surname: Shea
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BackLink https://www.ncbi.nlm.nih.gov/pubmed/25794148$$D View this record in MEDLINE/PubMed
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Conceived and designed the experiments: SBK MEM. Performed the experiments: MEM. Analyzed the data: SBK KMB MEM MKS DKH DWK BJN. Wrote the paper: SBK KMB MEM MKS DKH DWK BJN.
Competing Interests: The authors have declared that no competing interests exist.
These authors also contributed equally to this work.
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Snippet Obesity is associated with increased mortality, and weight loss trials show rapid improvement in many mortality risk factors. Yet, observational studies...
Background Obesity is associated with increased mortality, and weight loss trials show rapid improvement in many mortality risk factors. Yet, observational...
Background Obesity is associated with increased mortality, and weight loss trials show rapid improvement in many mortality risk factors. Yet, observational...
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StartPage e0121993
SubjectTerms Adults
Age
Blood pressure
Body mass
Body mass index
Body weight loss
Cardiology
Clinical trials
Confidence intervals
Data processing
Diabetes
Exercise
Fatalities
Female
Follow-Up Studies
Health aspects
Health risks
Heterogeneity
Humans
Identification methods
Internal medicine
Intervention
Male
Medical research
Medicine
Meta-analysis
Middle Aged
Mortality
Mortality risk
Nutrition research
Obesity
Observational studies
Older people
Physical fitness
Publication Bias
Randomization
Randomized Controlled Trials as Topic
Risk analysis
Risk factors
Sensitivity analysis
Studies
Systematic review
Task forces
Weight control
Weight Loss
Weight reduction
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Title Intentional Weight Loss and All-Cause Mortality: A Meta-Analysis of Randomized Clinical Trials
URI https://www.ncbi.nlm.nih.gov/pubmed/25794148
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http://dx.doi.org/10.1371/journal.pone.0121993
Volume 10
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