A 14-item Mediterranean diet assessment tool and obesity indexes among high-risk subjects: the PREDIMED trial

PLoS One. 2012;7(8):e43134. doi: 10.1371/journal.pone.0043134. Epub 2012 Aug 14.

Abstract

Objective: Independently of total caloric intake, a better quality of the diet (for example, conformity to the Mediterranean diet) is associated with lower obesity risk. It is unclear whether a brief dietary assessment tool, instead of full-length comprehensive methods, can also capture this association. In addition to reduced costs, a brief tool has the interesting advantage of allowing immediate feedback to participants in interventional studies. Another relevant question is which individual items of such a brief tool are responsible for this association. We examined these associations using a 14-item tool of adherence to the Mediterranean diet as exposure and body mass index, waist circumference and waist-to-height ratio (WHtR) as outcomes.

Design: Cross-sectional assessment of all participants in the "PREvención con DIeta MEDiterránea" (PREDIMED) trial.

Subjects: 7,447 participants (55-80 years, 57% women) free of cardiovascular disease, but with either type 2 diabetes or ≥ 3 cardiovascular risk factors. Trained dietitians used both a validated 14-item questionnaire and a full-length validated 137-item food frequency questionnaire to assess dietary habits. Trained nurses measured weight, height and waist circumference.

Results: Strong inverse linear associations between the 14-item tool and all adiposity indexes were found. For a two-point increment in the 14-item score, the multivariable-adjusted differences in WHtR were -0.0066 (95% confidence interval, -0.0088 to -0.0049) for women and -0.0059 (-0.0079 to -0.0038) for men. The multivariable-adjusted odds ratio for a WHtR>0.6 in participants scoring ≥ 10 points versus ≤ 7 points was 0.68 (0.57 to 0.80) for women and 0.66 (0.54 to 0.80) for men. High consumption of nuts and low consumption of sweetened/carbonated beverages presented the strongest inverse associations with abdominal obesity.

Conclusions: A brief 14-item tool was able to capture a strong monotonic inverse association between adherence to a good quality dietary pattern (Mediterranean diet) and obesity indexes in a population of adults at high cardiovascular risk.

Publication types

  • Clinical Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Aged, 80 and over
  • Body Mass Index
  • Cross-Sectional Studies
  • Diet
  • Diet, Mediterranean*
  • Feeding Behavior*
  • Female
  • Humans
  • Male
  • Middle Aged
  • Obesity / prevention & control*
  • Odds Ratio
  • Risk
  • Surveys and Questionnaires*
  • Waist Circumference

Grant support

The Official funding agency for Biomedical Research of the Spanish Government, Instituto de Salud Carlos III (ISCIII), provided the grants for his study: RTIC G03/140, CIBERobn, RD 06/0045, PI04-2239, PI 05/2584, CP06/00100, PI07/0240, PI07/1138, PI07/0954, PI 07/0473, PI10/01407 and PI11/01647. CIBERobn and RTIC RD 06/0045 are initiatives of ISCIII, Spain. RT is supported by a Rio-Hortega post-residency fellowship of the Instituto de Salud Carlos III, Spanish Government. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.