White Kidney Bean Extract- The extract of white kidney bean is a key ingredient which is seen in many of the carb blockers. This is considered to be the oldest food that is known to people who are spread world wide, but first are known to the Portuguese and Spanish, as they were the explorers. The reason as to why the white kidney beans functions effective regarding losing weight is due to a compound known as Phaseolus Vulgaris which is contained in the white kidney beans. This stops alpha – amylase enzyme from breaking - down in the digestive system from carbohydrates to sugars. When the carbohydrates are not broken in to sugars then this cannot be absorbed easily in the bloodstream and can’t be stocked up as fats.