From Jenny Craig to Weight Watchers, celebrities are jumping on the weight-loss bandwagon and getting paid big bucks for it. But money aside, many celebrities lose weight in pursuit of a healthier life.

With the help of diet and exercise (and in some cases surgery), these stars have undergone extreme transformations. Here are some of the most extreme weight-loss methods used by celebrities.

1. Drew Carey

How he did it: Eat less sweets and beer, stay active

2010, Drew Carey Drew Carey realized his love of beer and hearty food was causing him to gain weight. Since then, Parade said, he has lost more than 100 pounds and managed his diabetes through sustainable lifestyle changes. On healthy eating, Kelly said: "I went to a wedding on Saturday and I ate the cake. But 95 percent of the time, I was right."

2. John Goodman

Whether you remember Roseanne or The Big Easy, you're probably familiar with one of the main characters, played by Jon Goodman. If you've seen him recently, you've probably also noticed that he's lost a lot of weight. According to ABC News, he has lost about 100 pounds.

At a time when he wouldn't look in the mirror, Goodman attributes his weight loss to ending his overeating habit and exercising as much as possible. Now, he feels better than ever.

3. Adele

How she did it: Quit sugar, quit smoking

When Adele entered the music industry in 2008, she Becoming heavier and less shy. Adele told People magazine, "If I were an actress and had to play a character who was supposed to be 40 pounds thinner than I am, I would lose weight, but the weight would have nothing to do with my career."

2012 After her son was born in 2011, Adele stopped smoking and drank 10 cups of sugary tea a day. Her nutritionist attributes Adele's slim figure to a "clean diet rich in fruits and vegetables, plus lean proteins and complex carbohydrates." Regardless, Adele told Rolling Stone that she would "rather have lunch with friends than go to the gym."

4. Aretha Franklin

How She Did It: A Mysterious Surgical Procedure

A few years ago, the iconic "Respect" singer lost a ton of weight — 85 pounds, to be exact . According to People's Daily Online, Aretha Franklin underwent surgery and lost a significant amount of weight.

5. Jonah Hill

How he did it: Keeping a food diary, working out with a personal trainer

This celebrity’s weight follows the character’s Changing and wavering. But now, Jonah Hill is looking slimmer than ever. Us Weekly said Hill gained 40 pounds for his role in "War Dogs," but he lost the weight by tracking his meals and listening to his nutritionist. Channing Tatum suggested he eat less and get a personal trainer.