Which logical fallacy is used in the text?
My opponent argues that we should abolish the soda tax. It's a shame that he wants to encourage people to eat and drink unhealthily. I say we keep it.

 - appeal to nature: the assumption that natural things are always good
 - guilt by association: a negative association intended to discredit someone or something
 - straw man: a misrepresentation of an opponent's position that makes it easier to argue against
The text argues that the speaker's opponent wants to encourage unhealthy habits. However, this misrepresents the opponent's argument. The speaker's opponent only wants to remove the soda tax. This illustrates a type of logical fallacy known as a straw man.