Lose weight and win prizes - this is what residents are being told, as part of the first national campaign to incentivise healthy weight management.

The Health Promotion Board (HPB) launched its One Million KG Challenge on Friday in response to Singapore's growing obesity rate.

The HPB's 2010 National Health Survey, the latest data available, showed that 11 per cent of Singaporean adults aged 18 to 69 were obese in 2010, up from 7 per cent in 2004.

Under the challenge, participants who complete its activities can win prizes, including a car and a holiday package, especially if they achieve their weight management goals.

"With support, motivation and everyone working together, we can overcome the rising obesity trend," HPB's chief executive Zee Yoong Kang told The Straits Times. "We want people to understand that healthy living and healthy weight management can be achieved with making manageable changes in their lives."

The challenge is open to Singapore residents aged 18 to 64 whose body mass index ranges from 18.5 to 37.4. Those who fall into the moderate to high risk category of 23 to 37.4 can pledge to lose 3kg, while those who fall into the low risk or healthy category of 18.5 to 22.9 can pledge to maintain their weight.

Registration will open to the public from March onwards. More information can be found at www.millionkg.sg.