With National Chocolate Week in October, you might have been expecting a piece on the health benefits of chocolate. Fear not, I am writing one for you for Christmas but I noticed autumn arrive with shorted days and persistent rain so the immediate need is Vitamin D.
The sun is lower in the sky and the slanty light makes the views stunning across the hills early in the morning and the sea at sunset. The depth of the atmosphere are these angles means more absorption of shorter wavelengths including the beneficial UVB we need. Even leaving aside the fact that hardy Cumbrians can be seen out in shorts, T-shirts and sandals at any time of year, there simply isn’t enough UVB from October to March for our skin to make Vitamin D. The UV index has to be a minimum of 3. It’s only 1 as I write this with a forecast of 3 briefly over Wednesday lunchtime.
I’m keen where possible, on getting nutrients the way nature intended, from food. The best sources are fish liver oil, full fat dairy and eggs but you’re unlikely to get enough this way. This is where supplements can be helpful. Look for Vitamin D3; D2 is only half as effective. The strength might be labelled by weight in micrograms µg or by international units IU which relate to biological activity. For Vitamin D3, 1 µg is equivalent to 40 IU. So 25 µg capsules are equivalent to 1000 IU.
Vitamin D is fat soluble so it can build up and we each absorb it differently. The PHE recommend a dose of 10 µg / 400 IU which is modest. Some studies show that this is not enough and I take more. Your doctor can do a blood test to make sure you’re not overdosing. I asked for one in February and my level was fine so I’ll be supplement again each winter.
What about SAD (seasonal affective disorder)? A special lamp will compensate for the lack of light and has a beneficial effect but the wonderful Vitamin D even helps with SAD.
Top tip: Take Vitamin D supplements this winter.