The common rose coco beans (Phaseolus vulgaris) are the most commonly grown grain legumes that come second after maize as a subsistence crop. They serve as a source of protein which is relatively cheaper compared to animal proteins to the majority of the population in Kenya. Consumption of common bean is high mostly because it is relatively inexpensive compared to meat. Common bean plays a strategic role in alleviating malnutrition. Regular consumption of common bean is now promoted by health organizations because it reduces the risk of diseases such as cancer, diabetes or coronary heart diseases.