Moderate. Moderate if the best choice because sophisticated means a high level of intelligence, but moderate is just an average person.
Answer: According to the speaker, headlines about the benefits of chocolate and cheese came about when the scientist was doing studies with a drink that made people have less tryptophan in the brain.
Chocolate was learned about when Europeans explored Africa. I do not know how did found out. I hope this answers the "when" part of the question
