An Icelandic beauty queen has quit the pageant circuit after claiming she was branded "too fat" to win any more contests.

Miss Iceland 2015 Arna Ýr Jónsdóttir, says she was sent a message by the owner of the Miss Grand International beauty contest in Las Vegas advising her to “stop eating breakfast, eat just salad for lunch and drink water every evening until the contest.”

The 20-year-old, who is an accomplished gymnast and former member of the Icelandic national athletics team, says she was also told her shoulders are too "broad".

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Jónsdóttir, who is now returning home to Iceland and says she will no longer take part in beauty contests, posted her "goodbye" letter to the pageant's owner on Instagram, beginning the handwritten note: “I am a very strong woman, but sometimes my strength isn't enough.”

Organisers allegedly made the comments four days before the competition.

- Arna Ýr Jónsdóttir

Jónsdóttir claims that the advice to lose weight came from reps for the owner of the pageant, Thai TV star Nawat Itsaragrisil, with the message "he likes you and wants you to do well in this contest."

“If the owner of the contest really wants me to lose weight and doesn’t like me the way I am, then he doesn’t deserve to have me in the top 10,” she tells the Iceland Monitor.

“Yes, my shoulders are a bit broader than the other girls’ but that is because I was a member of the Icelandic national athletics team and I am proud of that,” she tells the news site.

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On Tuesday Jónsdóttir posted a picture of herself in casual sportswear with the caption, "I guess I like my sporty badass look more than my perfect beauty look."

Us too.

Miss Grand International has been contacted for comment.