Characterisation of chocolate eating behaviour
-- A.M. Carvalho-da-Silvaa et. al., Physiology & Behavior
Volume 104, Issue 5, 24 October 2011, Pages 929–933.

Key differences across subjects were: time and number of chews, time of last swallow and total number of swallows. Subjects were grouped into three clusters of eating behaviour characterised as, “fast chewers”, “thorough chewers” and “suckers”. The main differences between clusters were the time chocolate was kept in mouth, chew rate and muscle work.