Jude Law (Gained 20 to 30 Pounds)
Credit: Everett

A diet filled with burgers, ice cream, and soda gave Law his potbelly in Don Hemingway. The film's director, Richard Shepard, said of Law's weight loss: "I was like, ‘Just please don't have a heart attack until we are done filming.'"

The Bottom Line:
Law isn't a repeat offender, but the way he gained weight – with a diet high in saturated fats and sugar – could put him at risk for high blood pressure and high blood sugar. If he kept eating that way, he'd increase his risk for heart disease or fatty liver.