Miley Cyrus has been under scrutiny for her weight lately, with some even calling her "anorexic." Now the 19-year-old is firing back about the comments.

To be fair, the singer / actress has switched up her diet recently, but she's avoiding certain foods for a reason. Cyrus took to Twitter on April 8 to explain: "For everyone calling me anorexic I have a gluten and lactose allergy."

She continued to say, "It's not about weight it's about health. Gluten is crapppp anyway! Gluten free food is sooo good & healthy!" In response to a fan, she encouraged others to try her diet. "Everyone should try no gluten for a week!" she wrote. "The change in your skin, phyisical and mental health is amazing! U won't go back!"

Earlier on Sunday, Cyrus posted a photo of herself with her nose inside of a Carl's Jr. bag. Although she insisted she couldn't eat what was inside, she said, "My mouth is LITERALLY watering."

Cyrus has made several headlines lately for her new slender look and post-Pilates outfits. Most recently, however, the former 'Hannah Montana' star caused an online frenzy when a photo of her sans underwear made its way around the Internet.