Demi Moore and Ashton Kutcher have kicked off a new Master Cleanse extreme diet, and they're keeping fans up to date on their progress via Twitter.
 
The Hollywood couple took on the nutritional challenge together at the weekend and Kutcher admits he's already struggling.
 
In a tweet to followers, he writes, "hrs (hours) into the master cleanse. I want a steak, a beer, and a blow-pop. Hmmm this is gonna be rough."
 
The Master Cleanse is a diet that consists of nothing but a regular intake of maple syrup, lemon water and cayenne pepper.
 
Moore, who insists she's on the cleanse for "health reasons", adds, "2nd day better than the 1st!"
 
She writes, "let you know if I make it to day 4."

See more photos of Demi here!