Lilly Fowler

Megachurch pastor Rick Warren has become an outsized evangelical superstar: best-selling author of The Purpose Driven Life series, pastoral mentor and even political referee.

Now Warren is finding a new purpose: tackling his outsized waistline.

Warren, 58, says the revelation came about a year ago, during a marathon baptism session of about 800 people at Saddleback Church.

As he struggled to submerge members of his flock in the baptismal pool one by one, he realized his parishioners were heavy and that he, too, was fat, setting a terrible example.

Warren says his gradual weight gain — about two to three pounds a year — has added up over his 30 years as a pastor. To lose the extra pounds and inspire others to do the same, the former football player enlisted the help of three doctors.