Efron joined Grylls for his show, Running Wild, and admitted he got to a point in his life where all he cared about was partying.
"You can have some real challenges, and I know, you know, you were very honest about when you went to rehab and stuff," Grylls said to Efron, according to the Mirror. "What kind of led down that road?"
"The challenging part was never the work, you know, that was never it," Efron replied. "It's sort of the inbetween.
"The social aspects outside of it, I mean everywhere you go to a certain extent, there is press of some form. I mean whether you're going out to an event, where you're supposed to be out with friends, there will be press there, if you are leaving your house to go to the grocery store, there will be press there."
Although Efron never admitted exactly what his vice was, he explained that the pressure of his celebrity — plus feeling alone — was what eventually led him to want to get help.
"It can be everywhere, and it's, you know, it can be confusing," he said. "You spend a lot of time in your house going crazy, you know pretty soon you need a social lubricant."
After rehab, Efron attended Alcoholics Anonymous meetings and began seeing a therapist, and he appears to be on the mend.
"You know I just really never again want to have to take anything from the outside into me, to make me feel good about my outside."
And you'll see personalized content just for you whenever you click the My Feed .
SheKnows is making some changes!