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Journal of the American College of Nutrition, Vol. 26, No. 3, 243-249 (2007)
Published by the American College of Nutrition

Pinto Bean Consumption Reduces Biomarkers for Heart Disease Risk

Donna M. Winham, DrPH, Andrea M. Hutchins, PhD and Carol S. Johnston, PhD

Department of Nutrition, Arizona State University-Polytechnic, Mesa, Arizona

Address reprint requests to: Donna M. Winham, DrPH, Department of Nutrition, HSC 1386, 7001 East Williams Field Road, Arizona State University Polytechnic, Mesa, Arizona 85212. E-mail: donna.winham{at}asu.edu

Objective: To determine effects of daily intake of 1/2 cup pinto beans, black-eyed peas or carrots (placebo) on risk factors for coronary heart disease (CHD) and diabetes mellitus (DM) in free-living, mildly insulin resistant adults over an 8 week period.

Methods: Randomized, crossover 3x3 block design. Sixteen participants (7 men, 9 women) received each treatment for eight-weeks with two-week washouts. Fasting blood samples collected at beginning and end of periods were analyzed for total cholesterol (TC), low density lipoprotein cholesterol (LDL-C), high density lipoprotein cholesterol, triacylglycerols, high-sensitivity C-reactive protein, insulin, glucose, and hemoglobin A1c.

Results: A significant treatment-by-time effect impacted serum TC (p = 0.026) and LDL (p = 0.033) after eight weeks. Paired t-tests indicated that pinto beans were responsible for this effect (p = 0.003; p = 0.008). Mean change of serum TC for pinto bean, black-eyed pea and placebo were –19 ± 5, 2.5 ± 6, and 1 ± 5 mg/dL, respectively (p = 0.011). Mean change of serum LDL-C for pinto bean, black-eyed pea and placebo were –14 ± 4, 4 ± 5, and 1 ± 4 mg/dL, in that order (p = 0.013). Pinto beans differed significantly from placebo (p = 0.021). No significant differences were seen with other blood concentrations across the 3 treatment periods.

Conclusions: Pinto bean intake should be encouraged to lower serum TC and LDL-C, thereby reducing risk for CHD.






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