India, Nov. 19 -- Millionaire tech entrepreneur Bryan Johnson, 47, is spending millions to 'bio-hack' his body and reverse the ageing process. Recently, he took to Instagram to share how one treatment - injecting fat from a donor into his face to attain a more youthful look - went horribly wrong. He posted jarring close-up pictures of his bloated, red face, saying using donor fat on his face caused a 'severe allergic reaction'. Also read | Last meal at 11 am! Millionaire techie Bryan Johnson, obsessed with 'not dying', reveals secrets to slowing down ageing

In a long post alongside his recent pictures, Bryan - who is trying to live to be 150 -years-old - revealed that the idea for the fat injections came from his weight loss from his str...