Smartwatches could spot depression and reverse ‘pandemic’ of mental health problems

As technology progresses, watches are now able to accurately measure our sleep, detect heart problems, and even predict when you’re about to get ill.

New research suggests that these handy devices might even be able to foresee tomorrow’s mood, alerting users to potential symptoms of depression.

Researchers set out to address the ‘pandemic of mental illness’ caused by Covid-19. Data from the World Health Organization (WHO) showed that anxiety and depression spiked by a massive 25% worldwide in the first year of the pandemic.

NHS data shows that 1.91 million people contacted mental health services in April 2024, which is 41% higher than pre-pandemic figures from April 2019.

A joint team of Korean and US scientists have now developed a device that collects data about a person’s characteristics and behaviour that could affect their mood.

The device looks at heart rate, temperature and activity in real time to measure our body’s internal clock and identify any disruptions in circadian rhythm – the body’s natural 24-hour cycle.

The circadian rhythm influences physical, mental, and behavioral changes and has a strong effect on sleep, appetite and even our mood.

Studies suggest that the sleep and circadian brain system is a promising new target for treating mental health disorders, according to WHO. However, previous research has only been able to measure the body’s rhythms by drawing regular blood or saliva samples.

The research team have instead developed a technology that predicts symptoms such as sleep disorders, depression, loss of appetite, overeating, and decreased concentration in shift workers from biometric data alone.

Professor Dae Wook Kim, who led the team, said, "It is very meaningful to be able to conduct