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584 - ‘Long term gluten consumption in adults without celiac disease and risk of coronary heart disease: prospective cohort study’. BMJ. 357:j1892

Reference Number: 584

Year: 2017

Authors: Benjamin Lebwohl, Yin Cao, Geng Zong, Frank B Hu, Peter H R Green, Alfred I Neugut, Eric B Rimm, Laura Sampson, Lauren W Dougherty, Edward Giovannucci, Walter C Willett, Qi Sun, Andrew T Chan

Link: Link to original paper

Health: Cardiometabolic diseases | Metabolic syndrome | Non-communicable diseases

Summary

Objective To examine the association of long term intake of gluten with the development of incident coronary heart disease.

Design Prospective cohort study.

Setting and participants 64?714 women in the Nurses’ Health Study and 45?303 men in the Health Professionals Follow-up Study without a history of coronary heart disease who completed a 131 item semiquantitative food frequency questionnaire in 1986 that was updated every four years through 2010.

Exposure Consumption of gluten, estimated from food frequency questionnaires.

Main outcome measure Development of coronary heart disease (fatal or non-fatal myocardial infarction).

Results During 26 years of follow-up encompassing 2?273?931 person years, 2431 women and 4098 men developed coronary heart disease. Compared with participants in the lowest fifth of gluten intake, who had a coronary heart disease incidence rate of 352 per 100?000 person years, those in the highest fifth had a rate of 277 events per 100?000 person years, leading to an unadjusted rate difference of 75 (95% confidence interval 51 to 98) fewer cases of coronary heart disease per 100?000 person years. After adjustment for known risk factors, participants in the highest fifth of estimated gluten intake had a multivariable hazard ratio for coronary heart disease of 0.95 (95% confidence interval 0.88 to 1.02; P for trend=0.29). After additional adjustment for intake of whole grains (leaving the remaining variance of gluten corresponding to refined grains), the multivariate hazard ratio was 1.00 (0.92 to 1.09; P for trend=0.77). In contrast, after additional adjustment for intake of refined grains (leaving the variance of gluten intake correlating with whole grain intake), estimated gluten consumption was associated with a lower risk of coronary heart disease (multivariate hazard ratio 0.85, 0.77 to 0.93; P for trend=0.002).

Conclusion Long term dietary intake of gluten was not associated with risk of coronary heart disease. However, the avoidance of gluten may result in reduced consumption of beneficial whole grains, which may affect cardiovascular risk. The promotion of gluten-free diets among people without celiac disease should not be encouraged.

Significance of this study to the baker:

In this large-scale, longitudinal study, the long term dietary intake of gluten was shown to have no association with an increased risk of coronary heart disease. Interestingly, the study suggests that the avoidance of gluten may result in reduced consumption of beneficial whole grains, and in turn, increased cardiovascular risks. This goes to show that in those without celiac disease or allergies, the gluten-free diet will likely do more harm than good.

Qualify in Baking as Lifestyle Medicine

All reasonable care is taken when writing about health aspects of bread, but the information it contains is not intended to take the place of treatment by a qualified medical practitioner. You must seek professional advice if you are in any doubt about any medical condition. Any application of the ideas and information contained on this website is at the reader's sole discretion and risk.

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