Read this article and answer the following questions.
Parker, A.R., Byham-Gray, L., Denmark, R., and Winkle, P.J. (2014). The effect of medical nutrition therapy by a Registered Dietitian Nutritionist in patients with prediabetes participating in a randomized controlled clinical research trial. Journal of the Academy of Nutrition and Dietetics, 114, 1739-1748. doi: 10.1016/j.jand.2014.07.020
Why was this study done? What is the “problem”?