As the days get shorter and the weather grows colder, many people notice a change in mood. For some, this shift is more than just the ‘winter blues’ — it’s Seasonal Affective Disorder (S.A.D), a type of depression that follows a seasonal pattern.
What is Seasonal Affective Disorder?
S.A.D is a mood disorder linked to changes in daylight exposure. Most cases occur during Autumn and Winter, when daylight hours are shorter, though some people experience a rarer Summer-onset type. It is recognised as a form of major Depression with a seasonal pattern by the DSM-5 (Diagnostic and Statistical Manual of Mental Disorders).
When Does it Happen?
- Symptoms often begin in late Autumn as days shorten.
- Peak severity is usually in December through February.
- Symptoms tend to improve with longer daylight in Spring.
Facts & Figures
- Around 2 million people in the UK and 10 million in the US are affected by S.A.D each year (NHS & NIMH).
- Women are around four times more likely to be diagnosed with S.A.D than men (Royal College of Psychiatrists).
- The average onset is in people aged 18–30, though it can appear later in life.
Signs & Symptoms to Watch Out For
S.A.D mirrors symptoms of Depression, but with a strong seasonal link. Watch for:
★ Persistent low mood or sadness
★ Irritability or anxiety
★ Oversleeping (hypersomnia)
★ Low energy and motivation
★ Cravings for carbohydrates and weight gain
★ Withdrawal from social activities
★ Difficulty concentrating
If you notice these signs returning each Autumn/Winter, it may be worth discussing with a GP.
How to Take Care of Yourself
While professional support is key, there are everyday steps that can make a difference:
- Maximise Natural Light – Spend time outdoors daily, even when cloudy. Keep the curtains open and sit near windows during the day.
- Stay Active – Regular exercise boosts Serotonin and Endorphins, which help regulate mood.
- Structure Your Day – Set regular sleep and wake times to stabilise your body’s internal clock.
- Light Therapy – Using a clinically tested light box for 20–30 minutes a day can mimic natural daylight and reduce symptoms
- Social Connection – Stay connected with friends and family; even short interactions can lift mood.
Supplements That May Support Mental Wellbeing
Some people with S.A.D find that certain supplements help support mood and energy. Always consult a healthcare professional before starting new supplements, but here are a few that may be worth exploring:
- Vitamin D: Low levels are common in Winter months and linked with depressive symptoms.
- Omega-3 fatty acids: Found in fish oils, these support brain health and emotional regulation.
- B Vitamins (especially B6 and B12): Support energy production and neurological function.
- Magnesium: Plays a role in relaxation and reducing stress.
When to Seek Professional Help
If your low mood lasts for weeks, impacts your ability to function, or you experience hopelessness, loss of interest in activities, or suicidal thoughts, seek medical support immediately.
Helpful UK Organisations
★ NHS: https://www.nhs.uk/mental-health/conditions/seasonal-affective-disorder-sad/
★ Mind: https://www.mind.org.uk/information-support/types-of-mental-health-problems/seasonal-affective-disorder-sad/
★ Samaritans (24/7 support): https://www.samaritans.org or call 116 123
★ Rethink Mental Illness: https://www.rethink.org
Final Thoughts
S.A.D is more common than most people realise, but with awareness and proactive steps, its impact can be reduced. Paying attention to daylight exposure, movement, and nutrition, alongside professional support, can make Winter months much easier to manage.
👉 If you or someone you know struggles with S.A.D, take the first step today and talk to a professional, make small lifestyle changes, and don’t go through it alone.