The Oscar winner admits that she was never thin as a youngster but was never as heavy as other people seemed to think.
'I will tell you that when I was heavy, people would say to me, and it was such a backhanded comment, they would say, 'You've got such a beautiful face,'' Kate tells the April edition of Glamour magazine.
'In the way of, like, 'Oh, isn't it a shame that from the neck down you are questionable.''
Winslet admits that between the ages of eight and 11 she was the subject of a string of practical jokes by other kids.
'Looking back on it, I really wasn't that heavy. I was just stockier than the other sporty, whippy-looking kids.'
And the British-born star tells the magazine that she will never go down the Hollywood path of plastic surgery.
'My face is still moving, right? No, I have never tried any of that stuff,' she said.
'I don't have parts of my body that I hate or would like to trade for somebody else's or wish I could surgically adjust into some fantasy version of what they are.
'I just do my own stuff at home with the help of DVDs. A little bit of Pilates. And just recently I started running, but I'm not very good.'