Nearly two years after she was scrutinized for her weight and told critics to kiss her “fat ass,” Tyra Banks is revealing how she lost nearly 30 lbs.

It wasn’t because of a diet.

“I do not believe in diets. I have been on diets in the past, and they are a bunch of bologna,” she says on The Tyra Show, airing Wednesday (check your local listings). “This is a lifestyle change. It’s not about being skinny. It’s about getting in the best shape that you can be.”

She says she has been working with nutritionist Heather Bauer, who has helped her re-evaluate her eating habits by keeping a food diary.

“I switched up my unhealthy eating habits for healthier eating habits, and I haven’t had a tummy attack since December ’08,” she says.

Banks admits she still indulges – “some BBQ ribs and some ice cream and some Haagen Daaz” are her faves — but “just not every second.”

The trick?

“It’s about working with what you’ve got, and knowing, and learning what’s right for your body,” she says.

The 5′ 9″ model — who reveals she has maintained her “34DD boobies and her round booty” — was careful to stress that she doesn’t want to lose her curves.

“I feel good about my curves and my imperfections – my booty, my boobs, my thighs – I embrace it all,” she says. “Now I really can say … kiss my fat – and still fat – ass.

Source, Bauer-Griffin