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Melissa McCarthy has lost 45 pounds.
The 'Identity Thief' star has reportedly been following a new diet and fitness regime in a bid to improve her health for the sake of her daughters, Vivian, seven, and Georgette, four, with husband Ben Falcone, 41.
A source close to the actress said: "She's been making small changes and seeing big results. It's given her a real confidence boost.
"She has been on a high protein, low carb diet."
But the 44-year-old actress has no desire to shed too much weight, as she wants to maintain her curves.
The insider also told Star magazine: "Melissa knows that fans love her big and beautiful, and she's not obsessed with dieting. She's looking for a happy medium.
"Melissa realized she wasn't being as healthy as she could be. She wants to set a good example for her kids and she wants to be around to become a grandmother too."
The former 'Gilmore Girls' star previously insisted she didn't feel any pressure about her appearance in Hollywood.
Earlier this year, she said: "I've never felt like I needed to change. I've always thought, 'If you want somebody different, pick somebody else.'"
