Author Topic: Medical Myths  (Read 50795 times)

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Offline Skulker

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Re: Medical Myths
« Reply #285 on: November 22, 2010, 01:08:32 PM »
So what's an appropriate amount? 

I've been taking a 2,400 IU D2 tablet a few times a week, on the advice of a biochemist friend who says that the RDA is too low.
What's the matter? You don't your biochemist friend?  :laugh: :laugh:
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Re: Medical Myths
« Reply #286 on: November 22, 2010, 01:11:20 PM »
I've read that 10 minutes of sunlight on a fair skinned person is enough to get D daily.  And that low D levels are directly correlated with cancer, of almost all kinds.   

And that one third of all skin cancers are on areas of the body never exposed to sunlight, and that skin cancer rates are highest in populations located where there is little sunlight.

Interesting.  Let the mythbusting begin!
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Offline cerveauxfrits

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Re: Medical Myths
« Reply #287 on: November 22, 2010, 01:11:36 PM »
So what's an appropriate amount? 

I've been taking a 2,400 IU D2 tablet a few times a week, on the advice of a biochemist friend who says that the RDA is too low.
What's the matter? You don't your biochemist friend?  :laugh: :laugh:

I advice more when multiple sources agree on it.  I generally consensus more than I individual opinions.   ;D

Offline cerveauxfrits

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Re: Medical Myths
« Reply #288 on: November 22, 2010, 01:12:01 PM »
dupe

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Re: Medical Myths
« Reply #289 on: November 22, 2010, 01:15:18 PM »
     My elderly Uncle was found to be low in D, and his excellent specialist Doctor proscribed D for him.  The Doctor also told me, flat out, that low D levels is associated with cancer.  More so that sun exposure.  (Not sunburn, just getting a little sun daily)

     I reported him to the AMA police.
It is difficult to believe that a man is telling the truth when you know that you would lie if you were in his place. - H.L. Mencken

 “That men do not learn very much from the lessons of history is the most important of all the lessons history has to teach.” - Aldous Huxley

Offline pulsetsar

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Re: Medical Myths
« Reply #290 on: November 22, 2010, 02:05:55 PM »
And that one third of all skin cancers are on areas of the body never exposed to sunlight, and that skin cancer rates are highest in populations located where there is little sunlight.

And there are different types of skin cancer. Sunlight can lead to actinic keratosis, which can transform into squamous cell carcinoma, and basal cell carcinoma and these are typically found in sun exposed areas, but not always. Both of these are less likely to metastasize compared with malignant melanoma, the other big skin cancer, but they occasionally do and certainly can cause local disease that can be quite disfiguring upon excision.

Melanoma although associated with sun exposure as well can certainly crop up in areas of shaded skin. I always get nervous when I see a patient with a funny looking mole on the sole of his foot.

This variation in presentation should not be interpreted in a black and white fashion though. Just because you can get skin cancers in areas not exposed to sunlight doesn't mean that sunlight doesn't increase the risk. Most of the people who get BCC in non sun-exposed skin have a genetic predisposition, making for a multifactorial etiology of which sunlight is only one factor. The recommendation against excessive sunlight exposure and for sunscreen is pretty universal amongst dermatologists for a reason - and they're the ones most likely to benefit from a high incidence of skin cancer!
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Offline pulsetsar

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Re: Medical Myths
« Reply #291 on: November 22, 2010, 03:46:49 PM »
So what's an appropriate amount? 

I've been taking a 2,400 IU D2 tablet a few times a week, on the advice of a biochemist friend who says that the RDA is too low.

Depends on the age, underlying medical conditions, etc. Not sure about you specifically, but assuming your stores are adequate I don't know about much benefit beyond 800 IU daily (about what you're taking if you take the 2400 twice a week), which is what we recommend even for women with osteoporosis.

However, this is a maintenance dose and if your stores are low to begin with you usually need much higher doses to bring them up. The regimen most of us use is 50,000 IU once weekly for 12 weeks, followed by repeat levels to ensure an adequate response.
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Re: Medical Myths
« Reply #292 on: November 22, 2010, 06:23:45 PM »
Are the bulbs expensive?
Where can you buy them?

not expensive

I got them at Home Depot
It is difficult to believe that a man is telling the truth when you know that you would lie if you were in his place. - H.L. Mencken

 “That men do not learn very much from the lessons of history is the most important of all the lessons history has to teach.” - Aldous Huxley

Offline stands2reason

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Re: Medical Myths
« Reply #293 on: November 22, 2010, 06:27:01 PM »
So what's an appropriate amount? 

I've been taking a 2,400 IU D2 tablet a few times a week, on the advice of a biochemist friend who says that the RDA is too low.
What's the matter? You don't your biochemist friend?  :laugh: :laugh:

I advice more when multiple sources agree on it.  I generally consensus more than I individual opinions.   ;D

I accidentally this whole exchange.

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Re: Medical Myths
« Reply #294 on: November 22, 2010, 06:30:40 PM »
So, the big question is, are skin cancer rates higher in climates with little sun? 
It is difficult to believe that a man is telling the truth when you know that you would lie if you were in his place. - H.L. Mencken

 “That men do not learn very much from the lessons of history is the most important of all the lessons history has to teach.” - Aldous Huxley

Offline pulsetsar

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Re: Medical Myths
« Reply #295 on: November 23, 2010, 08:38:58 AM »
So, the big question is, are skin cancer rates higher in climates with little sun?

Well that's one question, but answering that only provides part of the picture, a common problem with observational studies. It doesn't factor in lifestyle differences, genetics, etc. On example of how this is important is multiple sclerosis. The incidence of this is higher in higher latitudes than lower ones, and this isn't just genetic variation since those born at lower latitudes but then move to a higher ones at a young age end up having the same chance of developing MS as those who were in the higher latitudes to begin with. A pretty interesting demonstration of an environmental association.

Let's say there is less skin cancer in the tropics - this only raises a host of other questions. Do people at lower latitudes / tropics have a stronger genetic resistance against skin cancer that developed over generations of exposure and selective pressure? Does darker skin, more prevalent in the tropics, confer some protective benefit? Are those with lighter skin in the tropics, like Australia, more likely to wear protective sunscreen and/or go out in the sun less because of awareness? Do those in temperate climates wear sunscreen less or stay out in the sun longer because they're less likely to get burned given the lower intensity of the sunlight? Are their genetics different? So many questions...
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Offline madjockmcferson

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Re: Medical Myths
« Reply #296 on: December 01, 2010, 05:45:49 PM »
I heard (years ago) that it takes 1 day for the effect of smoking a cigarette to be expunged from your body.....

Is this true? ..... and if you stop smoking does your body 'repair' itself at a steady rate, ie 1 cig a day, or does it increase, so for ex

1 day    1 cig
2 days   2 cigs
7 days   10 cigs
2 weeks 30 cigs

?!?
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Offline cerveauxfrits

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Re: Medical Myths
« Reply #297 on: December 01, 2010, 05:53:27 PM »
Well, to take an extreme example, your body's never going to repair itself if you smoke yourself up a case of emphysema.  So it may have a kernel of truth, but it still sounds fishy to me.

Offline madjockmcferson

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Re: Medical Myths
« Reply #298 on: December 01, 2010, 05:56:48 PM »
...yeah. Maybe I should qualify the question by saying....'assuming you haven't developed some sort of incurable disease'....or perhaps limit the situation to 'part-time smokers' - I used to smoke after a few beers for example....
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Offline jaypee

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Re: Medical Myths
« Reply #299 on: December 02, 2010, 07:00:47 AM »
I've heard this too. My boss told me the same thing when I was quitting smoking early this year, although he didn't say that it was 1 cigarette per day, just that it took 15 years for his lungs to return to normal after he quit.

I remember (vaguely) something from a health class in 5th grade where the nurse was describing how these cells "scrub" foreign particles from the tissue of the lungs, and that the more you smoke the less able they are to keep ahead of the tar you're building up until eventually they get so bogged down that they can't keep removing the influx of tar. After you quit smoking they begin to break down the humongous backlog of tar you've built up over the years.

It's not inconceivable to me that this would be true.
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