Anyone who has struggled with weight issues knows what a hefty issue it can be; the highs, the lows, the battle to keep on the right track for your health and happiness.
Screen stars are no different to the rest of us in this respect, and often face great pressure to maintain a body type that does not come naturally to them. Check out these incredible celeb transformations to inspire and invigorate!
1. Kirstie Alley
Screen legend Kirstie Alley transformed herself into the glamorous babe she is today - and she's 64. No, really.
2. Jessica Simpson
Popstrel Jessica Simpson made it look effortless when she shed the pounds to be on point for her new fashion campaign...
3. Tyra Banks
A self-confessed yo-yo eater, Tyra Banks has the courage to rock it when she's feeling out of shape - and the determination to spring back in her own time. You go, girl!
4. Jared Leto
It had totally slipped my mind that Jared Leto was once chubby, especially with his super-slim role in Dallas Buyers Club!
5. Jennifer Hudson
Gorgeous Jennifer Hudson went from busty belter to slinky songstress in her post-American Idol career. Oh, and she won this thing called an Oscar - so she's doing pretty great!
6. Renee Zellweger
Renee piled on the pounds for her role in Bridget Jones' Diary but soon turned it around. That's dedication!
7. Lea Michele
Gorgeous Glee girl Lea Michele's weight has fluctuated in the past, but she's always been beautiful.
8. Khloe Kardashian
Inspired by her sister's gym rampages, Khloe Kardashian ditched the fizz & fries and quickly bagged herself a buff bod in no time!
9. Wayne Knight
Well, Sally always thought he was a hunk on Third Rock From The Sun - and it's great to see Don (Wayne Knight) looking so proud of himself.
10. Nicole 'Snooki' Polizzi
Whatever your opinion of love-her-or-hate-her Snooki, there's no denying her impressive shape-up - not everyone could pull off the leopard print cape.
11. Janet Jackson
Even ultra-fit dancer Janet Jackson has had her moments, but always returned to her svelte self.
12. Jonah Hill
Funnyman Jonah Hill shed a huge amount of weight as his career skyrocketed, proving it's not just the blonde glam types who can change their ways.
... and one being inspiring the other way round!
Channing Tatum was named the "Sexiest Man Alive" due to his smokin' abs, a gorgeous asset he showed off in all the right movies! However, now Channing is father to an 8-month-old baby, and he describes himself as "fat and happy."
Mr. Tatum looks adorable a little cuddly, and how sweet that he's devoted himself entirely to being a daddy at the expense of personal vanity. Good for you, Channing!