The Chartered Society of Physiotherapy (CSP) has called for renewed government efforts to improve public health, after new data emphasised the substantial growth in obesity in recent decades.
Karen Middleton, chief executive of the CSP, said policymakers need to take "urgent action" on public health and outline their strategy at "the earliest opportunity".
She was speaking after a report from the Health and Social Care Information Centre (HSCIC) showed that obesity prevalence increased from 15 per cent in 1993 to 26 per cent in 2014.
Nearly two-thirds (65 per cent) of men and 58 per cent of women were overweight or obese in 2014, the figures revealed.
This health issue extends to the youngest members of society, with more than one in five children in the first year of primary school and one in three in year six found to be overweight or obese.
Obesity is twice as common among children living in the most deprived areas as those in the least deprived locations.
Ms Middleton said: "Unfortunately, the childhood obesity strategy continues to slip down the government's 'to-do' list - despite overwhelming evidence of the impact on individuals and the financial costs to the NHS."
The HSCIC data also showed that, in 2014-15, less than four out of ten adults (36 per cent) played sport at least once a week, while 57 per cent had not played any sport in the 28 days prior to the survey.
As far as treatment is concerned, the figures revealed that 519,000 items were prescribed for obesity via primary care in England during 2014, marking an eight per cent decline from 2013, when 563,000 items were prescribed.
The net ingredient cost of these prescriptions fell by half between 2011 and 2014, to £15 million.