The 37-year-old actress called Winfrey an inspiration while chatting with Vogue magazine about health and fitness, reported Entertainment Tonight.
When asked to name a woman who inspires body positivity, Hudson says, "Oprah Winfrey. I just think she is forever, that woman. You want to do the healthy thing, but you know what? Women fluctuate.
"We give birth to children and carry them and breastfeed them, some of us. We are busy and we're trying to work."
Hudson says the weight-loss challenges that women face is different from men.