Newham has been rated the happiest borough in east London by a new study.
Neighbouring Tower Hamlets, however, has seen the biggest drop in overall wellbeing over the past decade.
The figures come from mental health technology firm Paranimo, which conducted an analysis of Office for National Statistics (ONS) data.
This looked at three categories of overall personal wellbeing: life satisfaction, the extent to which people feel the things they do are worthwhile, and happiness.
Each local authority was given a weighted average score for these categories.
Paranimo compared the scores for each area from April 2013 to March 2023 to see the percentage increase or decrease in overall wellbeing.
Newham is the "happiest" east London borough, with the sharpest rise in overall wellbeing between April 2013 and March 2023.
The borough witnessed an increase of 9.25 per cent in life satisfaction, 6.04 per cent in worthwhileness and a 8.55 per cent increase in happiness.
These elements contributed to an overall wellbeing boost of 7.95 per cent over the ten-year period.
On the other hand, some parts of east London are sadder than they were a decade ago.
In Tower Hamlets, levels of life satisfaction dropped by 2.4 per cent, feelings of worthwhileness decreased by 3.95 per cent, and happiness fell by 8.6 per cent.
This amounted to an overall wellbeing decline of 5 per cent.
Other east London boroughs showed a mixed picture.
While increases in wellbeing were recorded in Barking and Dagenham (6.03 per cent), Redbridge (3.15 per cent) and Havering (1.68 per cent), these levels dropped by a sobering 2.66 per cent in Waltham Forest.
Paranimo co-founder and CEO Matthew Vamplew said: "To put these figures in perspective, the average percentage decline in overall well-being for all local authorities in the UK between April 2013 and March 2023 is a mere 0.34%."
Mr Vamplew had advice for anyone finding themselves in a bad place.
He added: "We strongly encourage anyone facing challenges to seek support, whether it be from family or friends, or ideally, a trained counselling professional.
"It’s not just on people to help themselves though, workplaces have an opportunity and responsibility to be proactive in supporting their worker’s mental health.
"Simple steps like fostering an empathetic culture, providing access to resources, and accommodating health needs can have an enormously positive impact on mental well-being for staff."
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