A pregnant Carrie Underwoodwill once again avoid turkey this Thanksgiving.

The 31-year-old country star, who grew up on a farm and has maintained vegetarian and vegan diets since she was a teenager, toldYahoo! Beautyin an interview posted on Tuesday that she will continue to remain meat-free during her pregnancy. The Grammy winner andAmerican Idolalumand husband Mike Fisher, a 34-year-old NHL player, are expecting their first child, a baby boy.

"I have been vegetarian for about 10 years now," she said. "With pregnancy, I am definitely going more on the vegetarian side, but as soon as I am not pregnant anymore I will go back to being vegan."

Maintaining a vegetarian diet while pregnant is healthy for both mothers and their children as long as the women get the appropriate vitamins and nutrients. Doctors may prescribe supplements.

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Pregnant women also require more protein in the second and third trimesters, according to thePhysicians Committee for Responsible Medicine. Therefore, lacto-vegetarians, who consume dairy, and lacto-ovo vegetarians, who also eat eggs, may find it easier to maintain a healthy pregnancy diet than vegans.

Expectant mothers who refrain from eating meat, fish and eggs are encouraged to consume other foods rich in iron, such as leafy vegetables and grains to minimize the risk of anemia, which can lead to birth defects. Vegan and vegetarian pregnant women are also at a higher risk of becoming deficient in vitamin B-12, which is found in animal-based proteins and milk but also in certain soy products.

In 2011, Natalie Portman switched from a vegan diet to a vegetarian one while she was pregnant with son Aleph...and had cravings for cookies and cake from "regular bakeries."

This past September, Underwood was spotted giving into a non-vegan craving of her ownshe was seen picked up a pint ofBen & Jerry's vanilla ice cream, which is made with cream, skim milk and egg yolks.

"I don't think I am craving anything too crazy," the singer told Yahoo! Beauty. "I try to keep it as healthy as possible and try to take care of myself. And, you know, putting good things in!"

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Carrie Underwood Plans to Be a Vegetarian While Pregnant, Then Switch Diets