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ARS Home » Research » Research Project #419061

Research Project: Childhood Diet, Health, and Obesity

Location: Office of The Area Director

2013 Annual Report

1a. Objectives (from AD-416):
Evaluate the benefit of adding nutritionally relevant amounts of bean powder (as a component of prepared food items) to the diets of adults with signs of metabolic syndrome for reduction of chronic disease risk, including factors related to cardiovascular disease and type 2 diabetes.

1b. Approach (from AD-416):
A prospective, randomized controlled clinical intervention will be designed, conducted, and evaluated by a multidisciplinary team of scientists from LSU AgCenter, ARS, and Pennington Biomedical Research Center (PBRC). Study participants will be overweight or obese men and women, 21-50 years of age, with a body mass index (BMI) between 29-34 kg/m2 and at least three signs of metabolic syndrome. The placebo-controlled crossover study design will consist of two intervention periods preceded by wash-out periods. Participants will be randomized to one of two study arms – placebo followed by intervention or intervention followed by placebo. At baseline and study end, overall health, cardio-metabolic risk factors, pro-inflammatory and anti-inflammatory indices, anthropometrics, body composition, satiety, dietary intake, and food cravings will be assessed. Compliance and adverse symptoms will be assessed weekly throughout the intervention periods. The primary outcomes of interest will be changes in cardio-metabolic risk factors from baseline to study end. Secondary outcomes to be evaluated will include: change in pro-inflammatory and anti-inflammatory indices, satiety, anthropometrics, body composition, and food cravings.

3. Progress Report:
In December 2010, an agreement was established between the USDA Agricultural Research Service (ARS) and the Louisiana State University (LSU) AgCenter (Baton Rouge, LA) for the purpose of conducting clinical trials to show a reduction of disease development with bean consumption. This clinical trial is being conducted at the Pennington Biomedical Research Center (PBRC) through an agreement with the LSU AgCenter. Due to the crossover design of the trial, participants are randomized to either the intervention or control arm initially (first phase), and after a one month wash-out period, begin the other arm (second phase) of the trial. Participant recruitment and enrollment is an ongoing process due to the nature of the study; hence participants have staggered start dates. Internal Review Board approval (necessary for the conduction of human research) was received for the project in December 2010. Recruitment for and the first arm of the trial began in August 2011, and the second phase of the trial began in January 2012. As of July 2013, 54 subjects had been screened for the trial, and of these, 17 were enrolled in the trial. Of these 17, 6 subjects completed both phases of the study, while 11 subjects dropped from the trial. Reasons for dropping included: pregnancy, dislike of the food, logistical issues, new job, surgery, cancer, and study length. The study was halted in September 2012, due to cost over runs by PBRC. LSU and PBRC are renegotiating costs for this study. Additionally, study protocol changes are being planned to help improve recruitment. The following food products have been produced for the project: hamburgers, sloppy Joes, chicken nuggets, buns, bagels and cream cheese, oatmeal bars, caramel bars, brownies, muffins, enchilada pie, spaghetti, lasagna pie, macaroni and cheese, and frozen yogurt.

4. Accomplishments