CBT beats light therapy for keeping SAD away next winter

Cognitive behavioral therapy is more effective than light therapy for preventing relapse of seasonal affective disorder in subsequent winters.

The research is pretty clear here. A randomized trial by Rohan and colleagues followed people who’d had SAD. Those who received CBT had a significantly lower relapse rate over two winters than those who used light therapy. We’re talking roughly 27% relapse for CBT versus 46% for light therapy. That’s a meaningful difference.

Why? Light therapy works like a daily medication – you have to set up the box every late fall and sit in front of it for 30 minutes all winter. If you skip it, the depression creeps back. CBT, on the other hand, teaches you skills: identifying negative thoughts about winter, scheduling enjoyable activities, and challenging the belief that you’re helpless when the days get short. Once you’ve learned those skills, they stick.

So while both are effective for treating an active episode of SAD, CBT gives you a persistent advantage. You carry the tools with you. Light therapy is a temporary fix you have to keep reapplying.

If you’re deciding between the two for long-term prevention, get the therapy. Future-you will thank you when you don’t need to remember where you put