Up until eight years ago, Dr Tan See Leng was overweight, tipping the scales at 128kg at one point.
Even for someone tall - he's 1.8m - he was, in his own words, "really big".
Already a subscriber? Log in
Read the full story and more at $9.90/month
Get exclusive reports and insights with more than 500 subscriber-only articles every month
ST One Digital
$9.90/month
No contract
ST app access on 1 mobile device
Unlock these benefits
All subscriber-only content on ST app and straitstimes.com
Easy access any time via ST app on 1 mobile device
E-paper with 2-week archive so you won't miss out on content that matters to you