Every year, new reports appear concerning the health risks posed by certain substances, such as coffee and sugar  One year an article claimed that coffee is dangerous to one' s health  The next year, another article argued that coffee has some benefits for one' s health
From these contradictory opinions, we see that experts are useless for guiding one' s decisions about one' s health
The argument presumes, without providing warrant, that one always wants expert guidance in making decisions about one's health.