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Title: Polyphenol intake and mortality risk: a re-analysisof the PREDIMED trial
Authors: Tresserra-Rimabu, Anna
Rimm, Eric B.
Medina-Remón, Alexander
Martínez-González, Miguel Ángel
López-Sabater, M. Carmen
Covas, María Isabel
Corella, Dolores
Salas-Salvadó, Jordi
Gómez-Gracia, Enrique
Lapetra, José
Arós, Fernando
Fiol, Miquel
Ros, Emilio
Serra-Majem, Lluis 
Pinto, Xavier
Muñoz, Miguel-Angel
Gea, Alfredo
Ruiz-Gutierrez, V.
Estruch, Ramón
Lamuela-Raventós, R.M.
UNESCO Clasification: 3206 Ciencias de la nutrición
Keywords: Mediterranean Diet
Polyphenol Intake
All-Cause Mortality
Stilbenes, et al
Issue Date: 2014
Journal: BMC Medicine 
Abstract: Background: Polyphenols may lower the risk of cardiovascular disease (CVD) and other chronic diseases due to their antioxidant and anti-inflammatory properties, as well as their beneficial effects on blood pressure, lipids and insulin resistance. However, no previous epidemiological studies have evaluated the relationship between the intake of total polyphenols intake and polyphenol subclasses with overall mortality. Our aim was to evaluate whether polyphenol intake is associated with all-cause mortality in subjects at high cardiovascular risk.Methods: We used data from the PREDIMED study, a 7,447-participant, parallel-group, randomized, multicenter, controlled five-year feeding trial aimed at assessing the effects of the Mediterranean Diet in primary prevention of cardiovascular disease. Polyphenol intake was calculated by matching food consumption data from repeated food frequency questionnaires (FFQ) with the Phenol-Explorer database on the polyphenol content of each reported food. Hazard ratios (HR) and 95% confidence intervals (CI) between polyphenol intake and mortality were estimated using time-dependent Cox proportional hazard models.Results: Over an average of 4.8 years of follow-up, we observed 327 deaths. After multivariate adjustment, we found a 37% relative reduction in all-cause mortality comparing the highest versus the lowest quintiles of total polyphenol intake (hazard ratio (HR) = 0.63; 95% CI 0.41 to 0.97; P for trend = 0.12). Among the polyphenol subclasses, stilbenes and lignans were significantly associated with reduced all-cause mortality (HR = 0.48; 95% CI 0.25 to 0.91; P for trend = 0.04 and HR = 0.60; 95% CI 0.37 to 0.97; P for trend = 0.03, respectively), with no significant associations apparent in the rest (flavonoids or phenolic acids).Conclusions: Among high-risk subjects, those who reported a high polyphenol intake, especially of stilbenes and lignans, showed a reduced risk of overall mortality compared to those with lower intakes. These results may be useful to determine optimal polyphenol intake or specific food sources of polyphenols that may reduce the risk of all-cause mortality.
ISSN: 1741-7015
DOI: 10.1186/1741-7015-12-77
Source: BMC Medicine [EISSN 1741-7015], v. 12 (1), Article number 77, (Mayo 2014)
Rights: by-nc-nd
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