Everyone¿s new favourite ¿ buttery and deliciously crisp with salted caramel chunks. Why are Harvey Nichols' Salted Caramel Biscuits so addictive? Now for the science bit¿ A study by the University of Florida has shown that salted caramel not only causes the brain to release drug-like chemicals but because you taste something new in every bite, the pleasure you receive from eating it keeps rising. In essence, we¿re powerless against the charms of this wonderful combination.