Which logical fallacy is used in the text?
Everyone I know is making fruit smoothies for quick, portable meals, so smoothies must be really good for you.

 - hasty generalization: a very broad claim based on very little evidence
 - bandwagon fallacy: the assumption that the popular choice is automatically correct
The text argues that fruit smoothies are good for you, because many people are drinking them. However, even though some people are drinking them, that doesn't necessarily mean that smoothies are necessarily healthful. This illustrates a type of logical fallacy known as the bandwagon fallacy.