Joo know what time it is?

A day after Jeremy Piven abruptly announced his decision to pull out of David Mamet’s Speed-the-Plow on Broadway because of an illness, chisme time has learned that Piven’s diet is to blame for his debilitatingly high levels of mercury.

“He was eating sushi twice a day and taking some Chinese herbs,” Dr. Carlon Colker, Piven’s physician and the executive officer and medical director of Peak Wellness, said. “I tested his heavy metals and his mercury was amazingly, shockingly high.”

Colker said that Piven’s mercury levels were roughly six times the amount an average body can handle. Colker said he made the diagnosis, as well as the play-exiting recommendation, after weeks of the Entourage star complaining of fatigue, with symptoms coming to a head this week.

The doctor said the recent Golden Globe nominee experienced a dizzy spell and was unable to remember his lines. “He was literally paralytic. He couldn’t move after the shows.”

Colker was quick to note that his recommendation to leave the play after two months, as well as Piven’s decision, did not come lightly.

“He is someone who has been acting for three decades, 17 hours a day. He’s really been an iron horse, so this is unusual for him.

“He really wanted to tough this out. It’s always been his dream to be on Broadway. But sometimes, the risks outweigh the benefits.”

The risks associated with mercury poisoning run the gamut from cardiac arrest, kidney failure, psychological problems and sometimes even death.

Piven was released from the hospital yesterday but has been ordered to significant bed rest. Colker said the actor should be able to resume acting by February or early March, luckily enough, around the time the new season of Entourage will begin filming.

William H. Macy, no stranger to a Mamet production, and Tony Award-winning stage vet Norbert Leo Butz will replace Piven in the play in consecutive runs through the show’s close on Feb. 22.