Sun-starved folk are at risk of never seeing the light of day ever again. Shrinks at Columbia University have thrown new light on Seasonal Affective Disorder (SAD), revealing that it can often lead to alcoholism and even suicide.

A week on the beach should lift your spirits. In one study, just 30 minutes of bright light per day for five days was enough to banish depression in half of the participants.

Years added: 1.7