No matter the time of year, it's always nice to get a fresh start. Often this change is brought on by adapting a healthier lifestyle, which can result in a new physique.

Whether or not it's health-related, Hollywood's actors and actresses are always changing up their looks to suit different roles. Look no further than Chris Pratt's buffed-up bod for 'Guardians of the Galaxy' or Renee Zellweger's weight gain for her role in the 'Bridget Jones' movies. In other cases, celebs just want to get toned.

Check out Hollywood's most dramatic weight loss before and after photos in the gallery above!

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