A television advertisement claims that a new energy drink is "scientifically proven" to boost focus because a well-known professional athlete endorses it, stating they drink it before every game. Which logical fallacy is primarily being used?

Explanation

The appeal to authority fallacy occurs when someone asserts that a claim is true because an authority figure (in this case, an athlete) supports it, even if that authority figure is not an expert in the relevant field (science, nutrition, or medicine). The athlete's endorsement provides no scientific proof of the drink's effectiveness.