Which logical fallacy is used in the text?
Yogurt is a healthful dietary choice because it's good for you.

 - circular reasoning: an argument that supports a claim with the claim itself
 - false dichotomy: an argument that presents only two choices when more options exist
 - straw man: a misrepresentation of an opponent's position that makes it easier to argue against
The text argues that yogurt is healthful because it's good for you. However, the "evidence" is just a restatement of the claim itself. This illustrates a type of logical fallacy known as circular reasoning.