Causes of Seasonal Affective Disorder

Light Intensity

There seems to be general agreement that SAD is basically caused by changing hours of sunlight and lower levels of daylight intensity.

In scientific terms, it is the disruption of the body’s clock - known as the circadian rhythm. There are various theories as to how this affects the body:

 - One theory is that it causes a reduction in the brain’s production of melatonin – this chemical governs sleep.
 - Another theory involves the reduced production of serotonin, which is a neurotransmitter and governs our mood.

Associated Effects

Reduced levels of direct sunlight can result in vitamin D deficiency. This deficiency is relatively common, but the vitamin is present in oily fish, egg yolk and liver. One symptom of the deficiency is tiredness.

Jet Lag

I am not aware of any research in this area, but it seems to me that people who suffer intensely from jet lag may be susceptible to SAD, and vice versa. I am a SAD sufferer, and very prone to jet lag. It takes me a week to recover from a 4-5 hour west to east flight. Certainly, the same brain chemicals seem to be involved.

Genetic Influences

There have been suggestions that it is related to a deep rooted hibernation cycle from way back in our genetic ancestry.  Many mammals exhibit hibernation behaviours, and perhaps there are vestiges of these behaviours still present in some people. For example:

• Autumn weight gain
• Difficulty getting out of bed in the morning
• Lethargy
• Springtime improvement of symptoms (the joys of spring?) 

This site seeks to provide a rich source of informations, ideas and guidance for sufferers of Seasonal Affective Disorder ("SAD"), or people who think that they maybe sufferers. It seeks help them gain an understanding of the condition and its causes. Following on from that, to take a balanced holistic approach to addressing the symptoms through a variety of potential therapies and remedies, many of which relate to lifestyle and personal issues. Some are fun and others may surprise you.

These include homeopathic remedies, exercise, holidays, moving home, light therapy, music, self management and social activities. In the event that symptoms are severe, then we recommend that qualified medical advice is sought. This site is not a source of medical advice.

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