Premise: Charantin is a chemical substance obtained from the Asian bitter melon ("Momordica charantia"), reputed to be responsible for the hypoglycaemic properties of those plants. It was identified by Lolitkar and Rao in 1960. It was also found in the similar African species "M. foetida", by A. Olaniyi in 1975, under the name foetidin.
Hypothesis: The name bitter melon is a misnomer, it is actually surprisingly sweet.