The Effectiveness and Cost of Lifestyle Interventions Including Nutrition Education for Diabetes Prevention: A Systematic Review and Meta-Analysis

Published:February 23, 2017DOI:https://doi.org/10.1016/j.jand.2016.11.016

      Abstract

      Background

      Type 2 diabetes is a significant public health concern. With the completion of the Diabetes Prevention Program, there has been a proliferation of studies attempting to translate this evidence base into practice. However, the cost, effectiveness, and cost-effectiveness of these adapted interventions is unknown.

      Objective

      The purpose of this systematic review was to conduct a comprehensive meta-analysis to synthesize the effectiveness, cost, and cost-effectiveness of lifestyle diabetes prevention interventions and compare effects by intervention delivery agent (dietitian vs non-dietitian) and channel (in-person vs technology-delivered).

      Methods

      English and full-text research articles published up to July 2015 were identified using the Cochrane Library, PubMed, Education Resources Information Center, CAB Direct, Science Direct, and Google Scholar. Sixty-nine studies met inclusion criteria. Most employed both dietary and physical activity intervention components (four of 69 were diet-only interventions). Changes in weight, fasting and 2-hour blood glucose concentration, and hemoglobin A1c were extracted from each article. Heterogeneity was measured by the I2 index, and study-specific effect sizes or mean differences were pooled using a random effects model when heterogeneity was confirmed.

      Results

      Participants receiving intervention with nutrition education experienced a reduction of 2.07 kg (95% CI 1.52 to 2.62; P<0.001; I2=90.99%, 95% CI 88.61% to 92.87%) in weight at 12 months with effect sizes over time ranging from small (0.17, 95% CI 0.04 to 0.30; P=0.012; I2= 86.83%, 95% CI 80.42% to 91.14%) to medium (0.65, 95% CI 0.49 to 0.82; P<0.001; I2=98.75%, 95% CI 98.52% to 98.94). Effect sizes for 2-hour blood glucose and hemoglobin A1c level changes ranged from small to medium. The meta-regression analysis revealed a larger relative weight loss in dietitian-delivered interventions than in those delivered by nondietitians (full sample: –1.0 kg; US subsample: –2.4 kg), and did not find statistical evidence that the delivery channel was an important predictor of weight loss. The average cost per kilogram weight loss ranged from $34.06 over 6 months to $1,005.36 over 12 months. The cost of intervention per participant delivered by dietitians was lower than interventions delivered by non-dietitians, although few studies reported costs.

      Conclusions

      Lifestyle interventions are effective in reducing body weight and glucose-related outcomes. Dietitian-delivered interventions, compared with those delivered by other personnel, achieved greater weight reduction. No consistent trend was identified across different delivery channels.

      Keywords

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      Biography

      Y. Sun is a doctoral degree candidate, Department of Agricultural and Applied Economics, Virginia Tech, Blacksburg.

      Biography

      W. You is an associate professor, Department of Agricultural and Applied Economics, Virginia Tech, Blacksburg.

      Biography

      B. Davy is a professor, Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg.

      Biography

      F. Almeida is an associate professor, Department of Health Promotion, Social and Behavioral Health, College of Public Health, University of Nebraska Medical Center, Omaha.

      Biography

      P. Estabrooks is Harold M. Maurer Distinguished Chair and a professor, Department of Health Promotion, Social and Behavioral Health, College of Public Health, University of Nebraska Medical Center, Omaha.