Many people believe that weight gain is the main reason why depression can lead to physical health problems later in life. However, a new long-term study from the University of Sydney challenges this common idea.
The research shows that disrupted sleep, rather than weight gain, may be the key factor linking depression in young people to future health risks such as diabetes and heart disease.
Depression is a common mental health condition that affects mood, energy, and daily life. It is especially common in young adults who are dealing with study, work, and life changes.
At the same time, doctors have noticed that people with depression are more likely to develop physical health problems later in life. Until now, many experts believed that this was mainly because depression could lead to weight gain and unhealthy lifestyle habits.
The new study, carried out by researchers at the Brain and Mind Centre at the University of Sydney, suggests a different explanation. The researchers followed more than 1,700 young Australians over ten years, from their early 20s into their 30s. This is an important period because most people do not yet show clear signs of serious illness.
The researchers looked at how depression, sleep patterns, and physical health were connected over time. They found that young adults who experienced depression were more likely to develop ongoing problems with their sleep. These problems included irregular sleep schedules and disturbed sleep patterns.
Over time, these sleep problems were strongly linked to insulin resistance. Insulin resistance happens when the body does not respond well to insulin, a hormone that helps control blood sugar. When this happens, blood sugar levels can rise, increasing the risk of type 2 diabetes and heart disease.
Importantly, the study found that weight gain did not explain this link. Even young people who were not overweight showed signs of increased metabolic risk if they had long-term sleep problems. This suggests that the body may start to develop health problems long before any visible signs appear.
Professor Ian Hickie, who led the research, explained that this is a missed opportunity for early action. If doctors wait until people gain weight or develop diabetes, it may already be too late to prevent serious health problems.
The study also highlights how important sleep is for overall health. Sleep helps regulate the body’s internal clock, which controls many important processes such as hormone levels, energy use, and metabolism. When sleep is irregular, these systems can become unbalanced.
Dr. Jacob Crouse, one of the researchers, said that improving sleep habits can be simple and effective. For example, waking up at the same time every day, getting sunlight exposure, and reducing light at night can help reset the body’s natural rhythm.
The study was published in the Journal of Affective Disorders and provides strong evidence that sleep plays a key role in the connection between mental and physical health.
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Source: University of Sydney.
