Megan Fox struggling to gain weight

New York: Her emaciated frame in the latest Armani lingerie ads had shocked fans but Hollywood bombshell Megan Fox`s trainer says that she is not anorexic.

Fox`s trainer Harley Pasternak said that the former `Transformers` star eats healthily but has a really fast metabolism, reported Huffington Post online.

"Do I worry about Megan getting too skinny? Yes. Believe it or not she has this really fast metabolism. People thought `Oh she must be anorexic` but she`s far from that," said Pasternak, who trains Fox and other celebrities like Robert Pattinson, Katy Perry and Amanda Seyfried.

The trainer said that the 24-year-old gets very upset when she hears rumours that she has an eating disorder, especially since she struggles to gain weight.

"She gets frustrated at times because she`s like `I need to put on weight`. So she actually weight-trains to keep on that lean muscle tissue," said Pasternak.