Tag: Randomized controlled trials

Given the inherent complexity of measuring individual dietary intakes and patterns, nutrition researchers employ a wide variety of scientific approaches to address specific health questions. What are the research designs used in nutrition research, and how do they contribute to the evidence base that shapes dietary recommendations and public health policy?

Observational studies have consistently shown that higher vitamin D intake is associated with a reduced risk of colorectal cancer and polyps. However, the results from large-scale, randomized controlled trials on whether vitamin D prevents polyps have been inconsistent, complicating the scientific picture.