7-8 Hours of Sleep: The Key to Lowering Depression Risk
A study of 290,000 people found that 7-8 hours of sleep was the biggest determinant in lowering depression risk.
The factors that influence the onset of depression are complex, involving a mix of biological and lifestyle factors. In new research published in Nature Mental Health, an international team of researchers, including from the University of Cambridge, looked at key factors that may explain this link, including:
- Lifestyle factors
- Genetics
- Brain structure
- Immune system
- Metabolic system
7 Healthy Lifestyle Factors That Lower Depression Risk
By examining data from almost 290,000 people (13,999 of whom had depression) over a 9-year period, the research team identified seven healthy lifestyle factors that significantly lowered depression risk:
✔ Moderate alcohol consumption
✔ Healthy diet
✔ Regular physical activity
✔ Healthy sleep
✔ No smoking
✔ Low-to-moderate sedentary behavior
✔ Frequent social connection
Sleep: The Most Protective Factor Against Depression
Of all these factors, healthy sleep (7-9 hours per night) had the greatest impact, reducing the risk of depression—including treatment-resistant depression—by 22%.
📌 Frequent social connection was the second most protective factor, reducing the risk of depression by 18% and offering the most protection against recurrent depressive episodes.
Lifestyle vs. Genetics: A Powerful Finding
Even for individuals at genetic risk for depression, researchers found that a healthy lifestyle can significantly reduce depression risk, regardless of genetic predisposition.
"Although our DNA – the genetic hand we've been dealt – can increase our risk of depression, we've shown that a healthy lifestyle is potentially more important."
— Professor Barbara Sahakian, University of Cambridge
Prioritizing Sleep for Mental Well-being
I really love a good research finding, and this one really hit home because I know firsthand how much sleep impacts how I feel.
Those first few years with the twins, I felt so far from myself, and sleep deprivation was a major factor in that.
We know that sleep is crucial for mental health, but it turns out that it’s one of the most important factors of all.
Breaking the Late-Night Scrolling Habit
And let’s be honest—how easy is it to lie in bed scrolling on our phones way past the moment we feel tired?
This is me reminding you to go to bed by 9:30 PM tonight.
Try it for a week. Feel the difference.
📱 Anything on your phone will still be there tomorrow. But with more sleep, you'll feel happier and healthier.
Source:
"Healthy lifestyle can help prevent depression – and new research may explain why" – University of Cambridge
