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The Science Behind Starch Blockers (White Bean Amylase Inhibitor) In the 1980s, a group of doctors from The Mayo Clinic conducted a significant study on purified White Kidney Bean extract carb blockers. The doctors investigated whether commercial bean-derived α-amylase inhibitor preparations (in the 1980s) failed to decrease starch digestion in humans because of insufficient anti-amylase activity, destruction by gastrointestinal secretions, or because of decreased...