The study was a 10 year longitudinal study involving 50,739 women, a mean age of 63 years.
Researchers recorded the number of women who developed clinical depression and compared it with:
- Coffee ( 80% cafeine
- Tea (12% caffeine)
- Soft drinks of 5% caffeine
2- Those who drank 4 cups or more had a 20% lower risk.
The results of the study support coffee as a protection against depression.
Read more info on this study.