Losing weight can be a hard thing for anyone, especially since exercise can be a bit of a a chore and fattening foods are often the most delicious.
What's even harder is slimming down and getting bad habits under control when you're constantly in the spotlight. It's tough to change your lifestyle when cameras are always in your face.
This is one of the many reasons that big weight loss transformations by celebrities stand out. It's a bit shocking to see someone step back into photos after a long absence, carrying about 50 less pounds with them.
Here are some of the most notable celebrities to have shed some pounds, and kept the weight off.
Originally known as Honey Boo Boo's mother on Toddlers in Tiaras, Mama June rose to fame when her family was given their own reality series, Here Comes Honey Boo Boo.
After stepping away from the spotlight following the show's ending, Mama June re-emerged earlier this year and showed off a jaw-dropping weight loss transformation. June once weighed 352 pounds, but now fits into a slim Size 4.
Actors have been known to put on and lose weight for various roles, but Jonah Hill has taken things to an entirely new level.
Hill became widely-recognized after his starring role in 2007's Superbad, where he portrayed an overweight high school senior. He's since lost weight for roles, put even more back on for others, and then lost it all once again.
Jonah Hill has become the weight-chameleon of Hollywood.
Back in July 2013, Rosie O'Donnell underwent vertical gastric sleeve surgery about a year after a heart attack threatened her life. When she debuted on The View in September 2015, the actress and TV personality showed off her new physique.
Once having weighed 237 pounds, O'Donnell lost 53 pounds by the time she returned to television.
In 2016, Williams revealed that she had lost at least 50 pounds over the previous three years. Since then, she's managed to keep the weight off by adopting better eating habits, including breakfast each and every morning.
When Dance Moms star Abby Lee Miller first revealed her significant weight loss, which took her from a size 24 to a size 16, rumors began spreading online that she had gone through surgery or taken part in a dieting gimmick.
None of those were true, as Miller began losing weight in 2014 through a series of unfortunate circumstances. Fortunately, Miller found a way to maintain her weight in the years since.
Elliot underwent a sleeve gastrectomy procedure that helped him lose close to 150 pounds in a matter of months. Thanks to the specific type of procedure that he underwent, the chef won't have any restrictions when it comes to the types of food he tastes.
If you ever had any doubt that Weight Watchers was a legitimate dieting source, Jennifer Hudson's story will surely change your mind.
After taking the world by storm as a contestant on American Idol, Hudson lost 80 pounds with Weight Watchers' point-tracking system. She eventually became the spokesperson for the brand. Seven years after the weight loss journey, Hudson is still maintaining her slimmer-than-ever physique.
The 65-year-old actor says that the secret to his massive weight loss is pretty simple: He just stopped eating so often. Once he changed his eating, and exercising habits, Goodman as able to feel better during long days on set.
Since 2009, Kelly has managed to lose 70 pounds with several different methods. The reality star used to participate in calorie-burning hula-hoop parties, and has since become an advocate for the mushroom-based diet called the M-Plan.