Acollege student who has been feeling fatigue decides to take an energy-boosting supplement advertised on a television infomercial and endorsed by a professional athlete. she reports feeling more energetic after taking the supplement but later discovers the supplement is only made of salt. what did the student experience

The answer is "The placebo effect; the student believing the supplement was working to increase energy".

A placebo refers a medical treatment  or method intended to deceive the member of a clinical examination. It doesn't contain any dynamic fixings however frequently still creates a physical impact on the person.  

Placebos are fundamental to the design of solid clinical preliminaries. Their once-astonishing impact on members has turned into the focal point of numerous examinations.  

The placebo effect alludes to the effect of a fake treatment on a person. Indeed, even inert treatment has over and over exhibited a quantifiable, positive health reaction.

answer; ///attempts to change more than once behavior at the same time;