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Low mood

Light therapy does beat placebo for seasonal affective disorder, but the studies behind it are small and uneven, which is why countries disagree about it. The US National Institute of Mental Health describes 30 to 45 minutes each morning at 10,000 lux. England's NHS says there is not enough evidence and does not usually provide it. Finland's national guideline calls it effective, grade A. And in one trial, group CBT kept more people well by the second winter.

Mind

Do SAD Lamps Work? What the Evidence Says About Winter Depression, Country by Country

A light box helps winter depression in trials, yet England's NHS doesn't usually provide one and Finland's national guideline rates it grade A. What each country recommends, and why a CBT program kept more people well a second winter later.

Oct 5, 20267 min readUnited States, Finland, United Kingdom, South Korea

Countries covered

Country	Articles
United States	Do SAD Lamps Work? What the Evidence Says About Winter Depression, Country by Country
Finland	Do SAD Lamps Work? What the Evidence Says About Winter Depression, Country by Country
United Kingdom	Do SAD Lamps Work? What the Evidence Says About Winter Depression, Country by Country
South Korea	Do SAD Lamps Work? What the Evidence Says About Winter Depression, Country by Country