Asher-Smith, the Team GB athletics captain for Tokyo, had been tipped to become the first British woman to take an individual sprint medal since Dorothy Hyman in 1960.
She plans to still run in the 4x100m relay.
Beijing 2008 javelin bronze medallist Goldie Sayers tweeted “I’ve no doubt her best Olympics is to come” while former Team GB footballer Casey Stoney described Asher-Smith’s interview as “absolutely heartbreaking”.
Sport can be so cruel at times. It takes guts going into an Olympics having been in the form of your life and know… https://t.co/My1TQhpAn6