The singer-actress sparked fears of a possible eating disorder when she tweeted an image of fast food, along with the caption: "I can't eat it. So I'm just gonna smell the s**ttttt out of it! My mouth is LITERALLY watering."
Cyrus later responded to some messages of concern from Twitter followers by clarifying that she is simply trying out a new diet.
"For everyone calling me anorexic I have a gluten and lactose allergy. It's not about weight it's about health. Gluten is crapppp anyway," she wrote.
"[E]veryone should try no gluten for a week! The change in your skin, physical and mental health is amazing! U won't go back!"
Cyrus recently denied that she and long-time boyfriend Liam Hemsworth are engaged, complaining: "People just wanna find something to talk about!"
The 19-year-old co-stars with Demi Moore in LOL, which opens on limited release in the US on May 4 and in the UK in June.
> Liam Hemsworth embarrassed about Miley Cyrus's partying ways?
> Miley Cyrus hits back on Twitter over pre-Oscars death threats
Watch a trailer for LOL below: