Oscar winner Mo'nique has undergone a fitness overhaul after realising she runs the risk of not living long enough to see her grandchildren.

The Precious actress, who has three children and a stepson, has long sported a bigger figure, but recently decided to get fit and change her eating habits.

She has shed 80 pounds (36 kilograms) since starting her health kick, and admits the thought of not being around for her family in the future kickstarted her fitness campaign.

She tells radio station Hot 97 Fm, "It made me say, 'Ok sis, you got these babies. The twins (Jonathan and David) are seven, (stepson) Michael's nine, Shalon's 22.' And I want to meet their babies. So, I said, 'Let me stop being selfish, and eating everything.' And I ate everything... I was a food junkie.

"I am the best Mo'Nique I've ever been in my life right now. And I still have a ways to go. But I feel amazing."