Researchers found that living within a kilometre of a gym, swimming pool or playing field, was linked to a smaller waistline, lower body mass index (BMI) and lower body fat percentage than others.

The findings, published in The Lancet Public Health journal, also showed that living further away from a fast food outlet was also weakly associated with a smaller waist and lower BMI.

But the researchers said that limitations to the data used may have meant that effect was underestimated.

The researchers said that their findings suggest that increasing access to physical activity facilities, and reducing access to fast food shops in residential areas may have the potential to reduce obesity.

Lead author Kate Mason, a PhD candidate at the London School of Hygiene and Tropical Medicine, said: "Policy makers should consider interventions aimed at tackling unhealthy built environments."

Around the world, urbanisation is recognised as a key driver of obesity, and certain features of neighbourhoods are likely to add to this, including a prevalence of fast food outlets and whether we have access to physical activity facilities.

"These aspects are often unequally distributed and might partly explain persistent social and geographical inequalities in obesity.

"The study included used data from UK Biobank from people aged 40 to 70 from around Britain, and included waist measurements from 401,917 people, BMI from 401,435 people, and body fat percentages from 395,640 people."

The study used data from 2006 to 2010, and assessed whether the number of physical activity facilities near an individual's home and proximity to fast-food outlets were associated with a person's waist circumference, BMI and body fat percentage.

The researchers accounted for a person's demographic, socio-economic status, and local area characteristics in these associations, and also looked at whether they varied by sex or household income.

Physical activity facilities included indoor and outdoor facilities for sports or leisure activities - such as gyms, swimming pools and playing fields, but not public parks, or cycling and walking paths.

On average, there was just one physical activity facility within one kilometre of people's homes, but a third of participants (31.2 per cent) had no facilities within this distance.

The average distance to a fast food outlet was 1.1 kilometres, and nearly a fifth of participants (18.5 per cent) lived within 0.5 kilometres of a fast food outlet.

People who had better access to physical activity facilities were less overweight than those who had access to fewer facilities - with those with at least six facilities nearby having a 1.22cm smaller waist circumference, a BMI 0.57 points lower, and a body fat percentage that was 0.81 per cent lower, on average.

The effect was stronger among women and people from higher-income backgrounds.

Compared with people living fewer than 0.5 kilometres from a fast food outlet, those living at least two kilometres away had 0.26cm smaller waist circumference, and BMI and body fat percentage were also associated with proximity to a fast food outlet.

However, the association was mostly among women, who were less overweight the further they lived from a fast food outlet.

The researchers suggest that this could be because women may spend more time in their local neighbourhood, and therefore be exposed to their local fast food outlets more than men.

Ms Mason added: "The results of our study suggest that increasing access to local physical activity facilities and, possibly, reducing access to fast food close to residential areas could reduce overweight and obesity at the population level.

Designing and planning cities in a way that better facilitates healthy lifestyles may be beneficial and should be considered as part of wider obesity prevention programmes.

"This could be improved by restricting the number of new fast food outlets in a neighbourhood and how close they can be to people's homes, incentivising operators of physical activity facilities to open in residential areas with few facilities, or funding local authorities to provide such facilities.

"Senior co-author Professor Steven Cummins, also of London School of Hygiene and Tropical Medicine, said: "National and local governments need to think seriously about 'designing in' health as cities grow in order to improve health and reduce health inequalities.

"It would also be important to make sure new physical activity facilities are affordable, especially when they are located in lower-income areas.

"The associations we observed were weaker for people from low-income households and this might be because they can't afford to use many of these facilities."