Winslet, whose youngest child turns two on Monday, was asked if she had been on a post-baby diet.
"No, I haven't," she told the magazine. "I genuinely haven't. I so didn't want to be one of those, 'Oh wow, she's back in shape after 12 weeks!' women."
She added: "To my mind, life is just too short to be spending time focusing on things like that.
"I want to have fun. And that's the other thing about having children: it is so much fun. And if you spend too much of your time focusing on the wrong stuff, like how much you weigh, you forget to enjoy the fun stuff, don't you?"
Winslet received a Variety Award at the British Independent Film Awards.
-AAP