13 Photos of Celebrities Who Have Changed Incredibly

Almost anything can push celebrities to try to lose weight. It can be a desire to live up to the generally accepted standards of what is considered ideal, the arrival of a new boyfriend or girlfriend, or a new role in the movie.

We have compiled a selection of 13 people who, for various reasons, managed to lose weight significantly.

13 PHOTOS

1. John Goodman decided to lose weight because he was afraid of dying too young from diseases caused by being overweight.

2. During her second pregnancy, Kim Kardashian made no secret of the fact that she gained a lot of weight. But she set herself the goal of returning to "Kim 2010" in a short amount of time, and she certainly achieved it.

3. Chris Pratt lost weight to look like the team leader in Guardians of the Galaxy.

4. Christina Aguilera decided to get in shape as a wedding gift to herself.

5. Mariah Carey lost weight to marry an Australian billionaire, trying to achieve a figure that, in her opinion, suited her new status.

6. Christian Bale risked losing so much weight for his role in The Machinist.

7. Seth Rogen lost weight for his role in The Green Hornet. The combination of exercise and diet seemed to be difficult to bear.

8. Kelly Osbourne was forced to lose weight in order to completely change her lifestyle.

9. Zach Galifianakis was inspired to lose weight by marrying his girlfriend, Quinn Lundberg. Later, he was also influenced by the desire to act in more serious film roles.

10. Matthew McConaughey lost a lot of weight for his role in the Dallas Buyers Club. The actor even said that he likes this process.

11. Changes in weight almost brought Jessica Simpson to a nervous breakdown. But the upcoming wedding made the star pull herself together.

12. Incredibly strong motivation to be slim allowed Janet Jackson to lose those hated kilograms.

13. After years of a seemingly hopeless struggle to lose weight, Oprah Winfrey found the perfect solution: she found a company that offered a variety of products and services to make weight loss easier. The results are obvious to everyone.