Madrid fashion week, one of Spain's most prestigious shows, is banning underweight models on the basis of their body mass index (BMI).
UN health experts recommend a BMI of between 18.5 and about 25, and some models may fall well below the minimum.
The Spanish Association of Fashion Designers has decided to ban models who have a BMI of less than 18.
Unhealthily skinny models at last year's fashion shows led to protests from doctors and women's rights groups.
The association agreed to use the BMI - a calculation based on height and weight - in response to local government pressure.
It suggests that 30% of would-be participants fail this test and this year's fashion week, which begins on 18 September, will offer medical treatment to excessively thin models.
madrin bans bone thin models :(
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