Ever wonder how celebrities do it -- keep up their busy work schedules, appear at all the latest, greatest parties and red carpet events, promote their personal causes and charity endeavors, and not lose all their marbles? Seems diet and exercise have something to do with it. Here, four stars weigh in on their high-energy tricks.

• Whoopi Goldberg stays energized by making healthy food and taking it wherever she goes to minimize temptation. While eating at someone else's house, she asks for very small portions. Good idea -- eating too much always weighs me down and makes me feel sluggish.
  
• Daniel Craig keeps up his strength by going to the gym every night when shooting Bond movies. He does as many of his own stunts too. His reward once shooting is over: Lying on a chaise lounge. Hey, relaxation is part of the whole feel-good package, right?
  
• Eva Mendes stays on top of things by running and keeping white flour and sugar out of her diet. It helps her feel better about herself.
• Gerard Butler just likes a good challenge. Give him one and he's invigorated.

  Stars who stay energized(click thumbnails to view gallery)

  

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I wrote in November that The View co-host Whoopi Goldberg was kicking butts. Tired of her smoking habit, she vowed to rid herself of cigarettes by December 15. So how's she doing? I found out today while watching Whoopi and crew interview Law & Order star S. Epatha Merkerson, herself a cold-turkey quitter after 23 years of smoking.

Whoopi is smoking one cigarette a day, she reports. She didn't meet her targeted end date, but what do you think? Poor performance? Or pretty good progress?

Whoopi is still determined to kick butts once and for all. Actress Merkerson's advice to her: Drink lots of water. Whoopi, who says she is plenty dehydrated, was thankful for the words of wisdom.