Broadcaster Andrew Marr is conscious and "responding to medication" while "continuing to progress" as he recovers in hospital following a stroke, the BBC said on Thursday evening.
The 53-year-old journalist and television presenter was taken ill on Tuesday.
A BBC spokesman said: "Andrew Marr is responding to medication and continuing to progress. He is conscious and eating. He and his family are touched by all the warm wishes and support flooding in."
Marr, 53, is the corporation's former political editor.
He began his career as a newspaper reporter, becoming the editor of the Independent before turning to television.
He has also presented a number of history programmes along with his politics show and has had five books published.
On Wednesday, many of Marr's colleagues in the media took to Twitter to express their sympathy.
Fellow BBC politics presenter Andrew Neil wrote: "Very distressed to hear news about Andrew Marr. Best wishes for full and speedy recovery."
Guardian columnist Polly Toynbee tweeted: "Andrew Marr, renaissance man, polymath, wise commentator, painter, runner, brilliant cook - and ace editor. Get well soon. Needed in public life."
Former Tory MP Louise Mensch said: "Joining in the chorus of well-wishers for Andrew #Marr. Hope he has a speedy and full recovery."
Around 150,000 people have a stroke each year in the UK with about a quarter of these in people of working age, according to the Stroke Association.
Its director of communications, Joe Korner, said: "We are deeply saddened to hear about Andrew Marr's stroke and our thoughts are with him and his family at this hard time.
"A stroke happens in an instant but the effects can often last a lifetime.
"However with the right care and support it is possible to make a recovery and return to a life after stroke."