Name: Why morning light is so crucial to your health | BBC Ideas
Uploaded: 2021-11-29T17:40:39.000Z
Duration: 6 min 6 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

and then; A blood-red orange, sets again.

Every aspect of how we function is controlled by light.

In winter we are seeing a lot less sunlight.

The perils of living without sunlight are really quite real.

In the 60s there were several experiments

by French people who went into caves and stayed there.

They all began to sleep either for extraordinarily long periods of time

or extraordinarily short periods of time,

They all said they had severe mood disturbances and depression,

so much so that some of them had to leave

In winter, we often feel somewhat out of sorts at this time of the year.

A lack of sunlight means that your immune system doesn't work as well,

your defence mechanisms don't work as well.

It times all of our physiology and all of our behaviour.

and all of the restorative processes are kept to the night.

The wavelengths that have the most powerful impact

that have a pigment that's sensitive to this blue light,

that then signals to the body clock to tell it what time of day it is.

Many people don't realise what an artificial life we live.

That's because artificial life depends on artificial light.

what that is doing is giving your body a time cue

Then you might end up feeling far more alert at night,

Your systems within your body tend to desynchronise

and so you tend to have a higher incidence of diabetes,

The World Health Organization sees shift work

Many British people spend less than half an hour a day in the open air.

So it's no good staying inside and looking at the Sun

and saying this is doing me good, because it isn't.

A good dose of bright sunshine at any time during the day

There was a study at the Broadmoor institute

where they looked at the effects of the equivalent

of 20 minutes of bright sunshine in the morning on mood.

When to go out, my nurse doth wrap me in my comforter and cap;

So our skin's not just a barrier, it's a living organ.

When our skin sees sunlight, that is when it starts making vitamin D,

of many different signalling pathways in our body.

You can do what I do, and take a vitamin D pill.

A diet of wild salmon and mushrooms and you won't get rickets.

But overwhelmingly the best way is through the Sun.

It's coming back for genuinely depressing reasons.

has gone down dramatically in the last 20 years.

It's gone down particularly fast in the last two or three years.

We're not getting outside, and this is going to have an impact

It makes us even more like hermits in a cave relying on artificial light.

Have meals at the right time, go to bed at the right time,

and get out, even if it's freezing, for that daily 20-minute walk

Simply being outside and exposing yourself to light,

so that you strengthen your circadian clock

is going to have a hugely beneficial impact on health and wellbeing.

go out and have a good time, that's the medical advice.