Seasonal Affective Disorder (SAD) affects around 1% of the UK population every year and up to one in eight suffer from the low spirits and lethargy that is commonly referred to as the winter blues.

Typical symptoms of SAD include tiredness, loss of energy and vitality, concentration problems, low spirits, gloomy feelings, listlessness, cravings for carbohydrates and weight gain. Sufferers of SAD can also experience depression. The main cause of these symptoms is believed to be a lack of daylight. Bright light sets the pace of our biological clock, which regulates our hormone production and increases our activity level. For example, to maintain our energy levels we need a certain amount of light, the daily average being 2500 lux for 2 hours. On an autumn day the outside light is only around 1500 lux, in our homes the artificial light from bulbs is only 300-500 lux.

The best way to offset SAD is to try and get as much daylight as possible. Simple steps, such as sitting close to a window or ensuring regular brisk walks throughout the day will help make a difference in your mood. Exercise is also important; there are some suggestions that 30 minutes of vigorous exercise three times a week will help combat depression and low moods. Despite the cravings for carbohydrates and sugary foods, it is essential to ensure that your diet includes plenty of fresh fruit and vegetables to help your body to get the vitamins it needs.