محمد الحربي

@meedo_k5

Joined September 2013

1.4K Following

592 Followers

2.2K Posts

meedo_k5 retweeted

Matthew Zirwas, MD

2 months ago

I’m a dermatologist. I’m supposed to say there is no amount of safe sun exposure. But I won’t, because that’s a lie. The attached shows how much sun is safe in different cities at different times of year. What do I mean by ‘safe’? I mean this: UV causes DNA damage and skin cancer. But, shockingly, your body repairs that damage. As long as the damage doesn’t outpace repair and start accumulating it shouldn't increase your risk of skin cancer. Data just came out that tells us how much UV you can get without damage accumulating. They took the people most susceptible to DNA damage from UV and exposed them to UV, then did skin biopsies to measure the damage, then more skin biopsies to measure the repair, and repeated it daily for 4 days. At 1.6 ‘Standard Erythemal Dose’ (SED) there was no accumulation of damage. So, the attached charts show how much sun it takes to get 1 SED in different cities at different times of the year at different times of day. And there are extra safety margins built in. It assumes a perfectly clear day with zero air pollution and that the sun is hitting your skin perpendicularly. Unless you’re laying flat, most sun is hitting you at an angle, which isn’t nearly as intense. But a bigger question you might be asking is ‘Why would a dermatologist be telling you to get sun in the first place?’ Because getting sun reduces your risk of death. Mostly by reducing your risk of heart attacks and strokes. That is very well proven. But it’s also very likely that sun exposure reduces your risk of autoimmune disease, dementia, cancer and depression. It’s just not as well proven as the protection against heart attacks and strokes. And before you reply and say ‘just take vitamin D!’, know that it has been ROBUSTLY proven that vitamin D has little (if any) benefit for preventing any of the above. Vitamin D is mostly useful as a marker of if you’re getting enough sun. What do I do myself and what do I tell my patients? Get as much unprotected sun exposure as you can without getting a burn. That’s my GUESS as to what has the best risk/benefit ratio. Dying of skin cancer is actually really rare, especially when compared to the risk of heart attacks, strokes, autoimmune disease, dementia and other cancers. But I’ll admit it’s not for sure best to get as much sun as possible, since sun does increase the risk of skin cancer and it might be the case the benefits plateau at a low level. So, if you’re really worried about skin cancer stick to the charts. The best science I can find says that amount won’t cause skin cancer. The takeaway? Sun is good for you, just don’t get a burn.

MattZirwas's tweet photo. I’m a dermatologist. I’m supposed to say there is no amount of safe sun exposure.

But I won’t, because that’s a lie.

The attached shows how much sun is safe in different cities at different times of year.

What do I mean by ‘safe’?

I mean this: UV causes DNA damage and skin cancer.

But, shockingly, your body repairs that damage. As long as the damage doesn’t outpace repair and start accumulating it shouldn't increase your risk of skin cancer.

Data just came out that tells us how much UV you can get without damage accumulating.

They took the people most susceptible to DNA damage from UV and exposed them to UV, then did skin biopsies to measure the damage, then more skin biopsies to measure the repair, and repeated it daily for 4 days.

At 1.6 ‘Standard Erythemal Dose’ (SED) there was no accumulation of damage.

So, the attached charts show how much sun it takes to get 1 SED in different cities at different times of the year at different times of day.

And there are extra safety margins built in. It assumes a perfectly clear day with zero air pollution and that the sun is hitting your skin perpendicularly. Unless you’re laying flat, most sun is hitting you at an angle, which isn’t nearly as intense.

But a bigger question you might be asking is ‘Why would a dermatologist be telling you to get sun in the first place?’

Because getting sun reduces your risk of death.

Mostly by reducing your risk of heart attacks and strokes. That is very well proven.

But it’s also very likely that sun exposure reduces your risk of autoimmune disease, dementia, cancer and depression. It’s just not as well proven as the protection against heart attacks and strokes.

And before you reply and say ‘just take vitamin D!’, know that it has been ROBUSTLY proven that vitamin D has little (if any) benefit for preventing any of the above. Vitamin D is mostly useful as a marker of if you’re getting enough sun.

What do I do myself and what do I tell my patients?

Get as much unprotected sun exposure as you can without getting a burn.

That’s my GUESS as to what has the best risk/benefit ratio. Dying of skin cancer is actually really rare, especially when compared to the risk of heart attacks, strokes, autoimmune disease, dementia and other cancers.

But I’ll admit it’s not for sure best to get as much sun as possible, since sun does increase the risk of skin cancer and it might be the case the benefits plateau at a low level.

So, if you’re really worried about skin cancer stick to the charts.

The best science I can find says that amount won’t cause skin cancer.

The takeaway?

Sun is good for you, just don’t get a burn.

MattZirwas's tweet photo. I’m a dermatologist. I’m supposed to say there is no amount of safe sun exposure.

But I won’t, because that’s a lie.

The attached shows how much sun is safe in different cities at different times of year.

What do I mean by ‘safe’?

I mean this: UV causes DNA damage and skin cancer.

But, shockingly, your body repairs that damage. As long as the damage doesn’t outpace repair and start accumulating it shouldn't increase your risk of skin cancer.

Data just came out that tells us how much UV you can get without damage accumulating.

They took the people most susceptible to DNA damage from UV and exposed them to UV, then did skin biopsies to measure the damage, then more skin biopsies to measure the repair, and repeated it daily for 4 days.

At 1.6 ‘Standard Erythemal Dose’ (SED) there was no accumulation of damage.

So, the attached charts show how much sun it takes to get 1 SED in different cities at different times of the year at different times of day.

And there are extra safety margins built in. It assumes a perfectly clear day with zero air pollution and that the sun is hitting your skin perpendicularly. Unless you’re laying flat, most sun is hitting you at an angle, which isn’t nearly as intense.

But a bigger question you might be asking is ‘Why would a dermatologist be telling you to get sun in the first place?’

Because getting sun reduces your risk of death.

Mostly by reducing your risk of heart attacks and strokes. That is very well proven.

But it’s also very likely that sun exposure reduces your risk of autoimmune disease, dementia, cancer and depression. It’s just not as well proven as the protection against heart attacks and strokes.

And before you reply and say ‘just take vitamin D!’, know that it has been ROBUSTLY proven that vitamin D has little (if any) benefit for preventing any of the above. Vitamin D is mostly useful as a marker of if you’re getting enough sun.

What do I do myself and what do I tell my patients?

Get as much unprotected sun exposure as you can without getting a burn.

That’s my GUESS as to what has the best risk/benefit ratio. Dying of skin cancer is actually really rare, especially when compared to the risk of heart attacks, strokes, autoimmune disease, dementia and other cancers.

But I’ll admit it’s not for sure best to get as much sun as possible, since sun does increase the risk of skin cancer and it might be the case the benefits plateau at a low level.

So, if you’re really worried about skin cancer stick to the charts.

The best science I can find says that amount won’t cause skin cancer.

The takeaway?

Sun is good for you, just don’t get a burn.

MattZirwas's tweet photo. I’m a dermatologist. I’m supposed to say there is no amount of safe sun exposure.

But I won’t, because that’s a lie.

The attached shows how much sun is safe in different cities at different times of year.

What do I mean by ‘safe’?

I mean this: UV causes DNA damage and skin cancer.

But, shockingly, your body repairs that damage. As long as the damage doesn’t outpace repair and start accumulating it shouldn't increase your risk of skin cancer.

Data just came out that tells us how much UV you can get without damage accumulating.

They took the people most susceptible to DNA damage from UV and exposed them to UV, then did skin biopsies to measure the damage, then more skin biopsies to measure the repair, and repeated it daily for 4 days.

At 1.6 ‘Standard Erythemal Dose’ (SED) there was no accumulation of damage.

So, the attached charts show how much sun it takes to get 1 SED in different cities at different times of the year at different times of day.

And there are extra safety margins built in. It assumes a perfectly clear day with zero air pollution and that the sun is hitting your skin perpendicularly. Unless you’re laying flat, most sun is hitting you at an angle, which isn’t nearly as intense.

But a bigger question you might be asking is ‘Why would a dermatologist be telling you to get sun in the first place?’

Because getting sun reduces your risk of death.

Mostly by reducing your risk of heart attacks and strokes. That is very well proven.

But it’s also very likely that sun exposure reduces your risk of autoimmune disease, dementia, cancer and depression. It’s just not as well proven as the protection against heart attacks and strokes.

And before you reply and say ‘just take vitamin D!’, know that it has been ROBUSTLY proven that vitamin D has little (if any) benefit for preventing any of the above. Vitamin D is mostly useful as a marker of if you’re getting enough sun.

What do I do myself and what do I tell my patients?

Get as much unprotected sun exposure as you can without getting a burn.

That’s my GUESS as to what has the best risk/benefit ratio. Dying of skin cancer is actually really rare, especially when compared to the risk of heart attacks, strokes, autoimmune disease, dementia and other cancers.

But I’ll admit it’s not for sure best to get as much sun as possible, since sun does increase the risk of skin cancer and it might be the case the benefits plateau at a low level.

So, if you’re really worried about skin cancer stick to the charts.

The best science I can find says that amount won’t cause skin cancer.

The takeaway?

Sun is good for you, just don’t get a burn.

MattZirwas's tweet photo. I’m a dermatologist. I’m supposed to say there is no amount of safe sun exposure.

But I won’t, because that’s a lie.

The attached shows how much sun is safe in different cities at different times of year.

What do I mean by ‘safe’?

I mean this: UV causes DNA damage and skin cancer.

But, shockingly, your body repairs that damage. As long as the damage doesn’t outpace repair and start accumulating it shouldn't increase your risk of skin cancer.

Data just came out that tells us how much UV you can get without damage accumulating.

They took the people most susceptible to DNA damage from UV and exposed them to UV, then did skin biopsies to measure the damage, then more skin biopsies to measure the repair, and repeated it daily for 4 days.

At 1.6 ‘Standard Erythemal Dose’ (SED) there was no accumulation of damage.

So, the attached charts show how much sun it takes to get 1 SED in different cities at different times of the year at different times of day.

And there are extra safety margins built in. It assumes a perfectly clear day with zero air pollution and that the sun is hitting your skin perpendicularly. Unless you’re laying flat, most sun is hitting you at an angle, which isn’t nearly as intense.

But a bigger question you might be asking is ‘Why would a dermatologist be telling you to get sun in the first place?’

Because getting sun reduces your risk of death.

Mostly by reducing your risk of heart attacks and strokes. That is very well proven.

But it’s also very likely that sun exposure reduces your risk of autoimmune disease, dementia, cancer and depression. It’s just not as well proven as the protection against heart attacks and strokes.

And before you reply and say ‘just take vitamin D!’, know that it has been ROBUSTLY proven that vitamin D has little (if any) benefit for preventing any of the above. Vitamin D is mostly useful as a marker of if you’re getting enough sun.

What do I do myself and what do I tell my patients?

Get as much unprotected sun exposure as you can without getting a burn.

That’s my GUESS as to what has the best risk/benefit ratio. Dying of skin cancer is actually really rare, especially when compared to the risk of heart attacks, strokes, autoimmune disease, dementia and other cancers.

But I’ll admit it’s not for sure best to get as much sun as possible, since sun does increase the risk of skin cancer and it might be the case the benefits plateau at a low level.

So, if you’re really worried about skin cancer stick to the charts.

The best science I can find says that amount won’t cause skin cancer.

The takeaway?

Sun is good for you, just don’t get a burn.

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محمد الحربي @meedo_k5

10 months ago

@oud_amoudi العامودي للعود اسم يكفي عن ألف وصف جودة ثابتة وفخامة ما تشبه أحد ريحة تعلّق بالمكان وتخلّيك ترجع لها كل مرة #العامودي_للعود

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محمد الحربي @meedo_k5

over 7 years ago

@nujoom_alwatan مبررروك يا ��لي تستاهل الكبتنيه والى الامام والله يوفقك يارب

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محمد الحربي @meedo_k5

over 7 years ago

@nujoom_alwatan يستاهل علي بالتوفيق

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Who to follow

وجودك والعدم وآحد

‏‏‏‏وعبر الزمان سنمضي معااا .... اهلاوي وافتخر

محمد الحربي @meedo_k5

almost 12 years ago

يُوجِدُ فَرق ، بَينَ آن آصمُت لِكَيء ﻵ يُؤَلِمُكِ حَديثَيء و بَينَ آن آصمُت حَتَىء ﻵ يُؤلِمُنيء جَوآبكِ"

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محمد الحربي @meedo_k5

almost 12 years ago

تجرِي المشاعرُ بما لأ تشَتهي العُقول | فـَ بَعضُ النَاس كَالكُتب ، أجمَل مَا فَيهُم الغِلاف فَقَط(y)

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محمد الحربي @meedo_k5

almost 12 years ago

ﻟۆ ﯾﻓﯾد اﻟﺑۆح ﻣﺂﮐﻧﺂ ﺳﮐﺗﻧﺂ ﺑس ﻋﻗۆل اﻟﯾۆم ﻣﺂﺗﻓهم ﻋﻟﯾﻧﺂ ﻟﺂﺣﮐﯾﻧﺂ اﻟﺻدق ﻗﺂﻟۆﺂ ﻣﺂﺻدﻗﻧﺂ ۆﮐذﺑۆﺂ ﺑﺂﻟﺻدق ۆﺣطۆ اﻟﻋﯾب ﻓﯾﻧﺂ..

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محمد الحربي @meedo_k5

almost 12 years ago

كل شي يصير بحياتي يعتبر خيره إن راح غالي تعوض قلبي بـ غالي إللي يقدّرني فوق الراس تقديره وإللي خسرني ترى ما حرّك ظلالي”

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محمد الحربي @meedo_k5

almost 12 years ago

✨يـإطمـؤوحـئ مإعلـئ إلدنيـإ مـلإمَ مّإيـمل مـن الصـبر غيـر الغشـيم ؤأنـإ كـل مإضقـت مـن كثـر الكـلإم أصـبر الخـإطر وأقـؤل آللہ_كـريم

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محمد الحربي @meedo_k5

almost 12 years ago

أضحك..ترى الأيـآم .. لآبد .. تبكيك وأركض .. تراك بـ يوم .. لآبد .. تآقف هذي تجارب نآس .. من دون تشكيك وهذي خلآصة عمر .. كله ..موآقف

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محمد الحربي @meedo_k5

almost 12 years ago

على كثر مَ آتضايق منشرح صدري ولي قلب / مآ يدخله كره وحزازيّه ! آضايق الناس وآزعّلهم و آنا مدري ( ثلااث آربـااع زلااتي على النّيه ) !

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محمد الحربي @meedo_k5

almost 12 years ago

قالوا أن الصمت يا ناس هيبه لا صار كثر الحكى ماله تعابير لكن ترى الساكت سكوته مصيبه يسكت وهرجه في وسط جوفه براكين

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محمد الحربي @meedo_k5

almost 12 years ago

أخطيت في حقي ولا زلت غالي شفني على كبر الخطا ما كرهتك خليتك لنفسك وسود الليالي أقدر على جرحك لكن ما جرحتك”

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محمد الحربي @meedo_k5

almost 12 years ago

لحظه عجز لما تحاول تبادر وتسعد شخص رغم انه بارد معاك ولا يفتش عنك بس ما تبي علاقتك فيه تخرب لأنه - يعنيلك كثير

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محمد الحربي @meedo_k5

almost 12 years ago

حَاول أنْ لا تَكسِر قلباً جَميلاً أحبّك بصِدقْ

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محمد الحربي @meedo_k5

about 12 years ago

آلدُنيآ كِتآبہ ، بدآيتُهأ صدآقَه ، وأروَع موآضيعُهأ آلصّرآحه ، وآخر سطُورها آلذّكرياآت 

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محمد الحربي @meedo_k5

about 12 years ago

إن كنت تهوى قربيّ أخبرني بذلك سأقترب لك أكثر لأن لدي كبرياء عندما اراك غير مهتم اكتفيّ ب البعد ..

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محمد الحربي @meedo_k5

about 12 years ago

شفته البارح حكيت وحكالي واعجبني أسلوبه وصدقه وقلبه وبعدها مادري وش اللي جرالي الله يستر قلبي ليكون حبه

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محمد الحربي @meedo_k5

about 12 years ago

مَعنى الجَمال بَ إختصِار .. طيبَة النفسَ وآحِترامُ الذاتَ ونقَاءُ القَلب

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