Ariana Grande is in the midst of an intensive promotion ... Dr. Dennis Schimpf, a plastic surgeon, for example, claims that her vegan diet might be to blame. "Vegan diets do tend to have issues ...

Ariana Grande's friends are worried the actress' non-stop schedule is taking a toll on her health. The singer and actress, 31, who stunned in a blush pink and black gown at the BAFTAs in London ...