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. 2017 Apr 4;16(1):21.
doi: 10.1186/s12937-017-0243-8.

Dietary Inflammatory Index and Risk of First Myocardial Infarction; A Prospective Population-Based Study

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Free PMC article

Dietary Inflammatory Index and Risk of First Myocardial Infarction; A Prospective Population-Based Study

Stina Bodén et al. Nutr J. .
Free PMC article

Abstract

Background: Chronic, low-grade inflammation is an established risk factor for cardiovascular disease. The inflammatory impact of diet can be reflected by concentrations of inflammatory markers in the bloodstream and the inflammatory potential of diet can be estimated by the dietary inflammatory index (DIITM), which has been associated with cardiovascular disease risk in some previous studies. We aimed to examine the association between the DII and the risk of first myocardial infarction (MI) in a population-based study with long follow-up.

Method: We conducted a prospective case-control study of 1389 verified cases of first MI and 5555 matched controls nested within the population-based cohorts of the Northern Sweden Health and Disease Study (NSHDS), of which the largest is the ongoing Västerbotten Intervention Programme (VIP) with nearly 100 000 participants during the study period. Median follow-up from recruitment to MI diagnosis was 6.4 years (6.2 for men and 7.2 for women). DII scores were derived from a validated food frequency questionnaire (FFQ) administered in 1986-2006. Multivariable conditional logistic regression models were used to estimate odds ratios (OR) and 95% confidence intervals (CI), using quartile 1 (most anti-inflammatory diet) as the reference category. For validation, general linear models were used to estimate the association between the DII scores and two inflammatory markers, high-sensitivity C-reactive protein (hsCRP) and interleukin 6 (IL-6) in a subset (n = 605) of the study population.

Results: Male participants with the most pro-inflammatory DII scores had an increased risk of MI [ORQ4vsQ1 = 1.57 (95% CI 1.21-2.02) P trend = 0.02], which was essentially unchanged after adjustment for potential confounders, including cardiovascular risk factors [ORQ4vsQ1 = 1.50 (95% CI 1.14-1.99), P trend = 0.10]. No association was found between DII and MI in women. An increase of one DII score unit was associated with 9% higher hsCRP (95% CI 0.03-0.14) and 6% higher IL-6 (95% CI 0.02-0.11) in 605 controls with biomarker data available.

Conclusion: A pro-inflammatory diet was associated with an elevated risk of first myocardial infarction in men; whereas for women the relationship was null. Consideration of the inflammatory impact of diet could improve prevention of cardiovascular disease.

Keywords: CVD cardiovascular disease; DII Dietary inflammatory index; IL-6 interleukin 6; MI Myocardial infarction; MONICA Monitoring of trends and determinants in cardiovascular disease; NSHDS Northern Sweden health and disease study; VIP Västerbotten intervention programme; hsCRP high-sensitivity C-reactive protein.

Figures

Fig. 1
Fig. 1
Flow chart illustrating the selection and exclusion of study participants. Abbreviations: VIP, Västerbotten Intervention Programme; MONICA, Monitoring Trends and Determinants in Cardiovascular Disease; MI, myocardial infarction; FFQ, food frequency questionnaire; FIL, food intake level
Fig. 2
Fig. 2
Abbreviations: RERI, relative excess risk due to interaction; S, synergy index. Joint effect of dietary inflammatory index (DII) and smoking status, on the risk of first myocardial infarction (MI) in a men b women. Odds ratios (OR) were estimated from multiple regression models adjusted for total energy intake, total serum cholesterol, systolic blood pressure, body mass index (BMI), diabetes, and postsecondary academic education. The calculations of RERI and S were performed comparing daily smokers/non-smokers and low DII/high DII

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