Journal of the American College of Nutrition
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Dietary guidelines have broad implications for the health of individuals and populations. Increasingly, government agencies and medical organization that issue guidelines have pursued evidence-based approaches. These approaches emphasize a comprehensive, critical, and explicit examination of the scientific evidence that the proposed dietary practice will improve health. ⋯ Dietary guidelines should also consider untoward effects, potential harms, and economic implications to society, the food industry, and others. A hallmark of evidence-based guidelines is making explicit the strength of recommendations and the quality of the evidence on which they are based. Grading systems are commonly used to rate the quality of the supporting evidence.
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Randomized Controlled Trial
Acute effect of black and green tea on aortic stiffness and wave reflections.
While most studies have shown an inverse relation between tea consumption and cardiovascular risk, other studies have shown opposite results. Aortic stiffness and wave reflections are markers of cardiovascular disease and prognosticators of cardiovascular risk. ⋯ Both black and green tea increases acutely wave reflections and only black tea increases aortic stiffness. Tea flavonoids may play a role in the attenuation of the effects of caffeine contained in tea.