"The message that gets communicated to women is that their self worth should be determined by a number on the scale or the size of pants that they wear, and that's a really harmful message," she said. "Health comes in different sizes."
She added that research has shown that acceptance of one's body type can ultimately prove beneficial, especially when that acceptance is paired with a healthy lifestyle. And that's something Kirby and Gregg say they're all for.
"Stopping dieting is not shunning a healthy lifestyle," Kirby said. "I've started jogging, I've been relearning how to roller skate and do yoga and Pilates."
"I try to eat a balanced diet," Gregg said, noting that her daily diet usually consists of a bowl of cereal for breakfast and a submarine sandwich for lunch. "This is just where my body stabilized."
Both Kirby and Gregg said they would consider losing weight if they were specifically asked to do so by a doctor. But, both noted, they would first obtain a second opinion. Both women say their recent physicals have shown that they are in fine health, and that their cholesterol and blood pressure levels are normal.
That's not to say there aren't some downsides to being large, the women acknowledge.
"I can have a hard time finding clothes," Kirby said. "And that sucks!"
But they say the benefits of accepting their size -- and staying off of rigid diet regimens -- far "outweighs" the bad.
"The only thing I've let go is the hatred of myself," Kirby said.
"I'm fat," said Gregg. "It's OK to use that word and it's OK to relate that word to fabulous. Young, fat and fabulous."