According to Dr Foster Intelligence, 7.6 per cent of adults registered at GP practices in the city are classed as obese.
The map and accompanying report, Weighing Up the Burden of Obesity, shows almost one in 10 patients has a body mass index of 3
0 or above.
This means they are at risk of diabetes, heart disease and living less long.
A body mass index of under 20 is underweight, 20-25 is normal, 25-30 is overweight and above 30 is obese.
In comparison only 6.8 per cent of patients in Hampshire as a whole are registered as obese.
The map uses figures from GP practices relating to the Quality and Outcomes Framework for 2006/07.
Colin Waine, chairman of the National Obesity Forum, said: 'The rates of obesity in England are very worrying.
'It is important that people understand both the dangers of obesity, and the benefits to their health of losing weight.
'Even a modest reduction of five to 10 per cent of body weight leads to reduced blood pressure, a reduction in the risk of developing diabetes, a fall in obesity-related cancer deaths and a reduction in total mortality.
'We strongly urge anyone who might be at risk to see their GP who can advise them on weight-loss options that are tailored to their needs.'
The full article contains 246 words and appears in The News newspaper.
