Have you tried the Master Cleanse all the kids are talking about?  Basically, you stop eating real food for a couple of weeks . . . and instead, suck down juices and spices and other gross stuff.

It's the reason JAKE OWEN had a clean colon when he opened for JASON ALDEAN at Madison Square Garden on Saturday.

I'll let Jake explain:  Quote, "I was like, 'BEYONCÉ did it.  OPRAH says it's cool.'  I researched it.  Basically, you drink lemon juice, water, cayenne pepper, and maple syrup for 14 days.  I went for 10 days . . . and they say 10 is plenty."

Unfortunately, Jake forgot that it might be tough trying to perform with NO FOOD powering his body.  He said, "I didn't eat for 10 days, and I started a brand new tour.

"And the first couple days, I was out there running around on stage as I'm used to doing, and I realized, I haven't eaten in like six days.  I hope I have the energy to do this.

"Thank goodness by the time we played Madison Square Garden, I'd already been back to eating whole food."