This outcome was true even for people who drank coffee on a regular basis.
One systematic review indicated that coffee can play a significant role in protecting people from depression.
The shape of this relationship was similar to the one with coffee and risk of death, and the strongest protective effect came at around 400 ml of coffee per day.
The authors did also find that caffeine and tea had some effects on protecting against depression, but this wasn’t as strong.
Another study also found that drinking coffee helped to decrease depression risk.