Which logical fallacy is used in the text?
Did you know that raspberry-flavored candy used to be made with a liquid secreted by beavers? Candy used to be so much healthier than it is now.

 - appeal to nature: the assumption that natural things are always good
 - circular reasoning: an argument that supports a claim with the claim itself
 - slippery slope fallacy: the false assumption that a small first step will lead to extreme consequences
The text argues that candy flavored by beaver secretions is healthier. However, a candy isn't necessarily healthy just because it's naturally flavored. This illustrates a type of logical fallacy known as an appeal to nature.