But primates are quite different from humans, aren't they?
Yes, which is why I prefer to take at least 4,000 mg/day instead of 2,500 mg/day. Below 2,500 mg/day is when adverse effects are seen. It's a lot easier to study the effects in primates than in longer-lived humans. I think it will be awhile before we see good studies on vitamin C at 4,000 mg/day. 2,600 mg/day is the minimum amount recommended by Linus Pauling 20 years ago. His max as potentially having benefit for some in the general population was 10,000 mg/day but he preferred to take 18,000 mg/day into his 90's. Some will say we have new information, but really most of the "new" information is wrong-headed. Like the Levine study that used twisted reasoning to conclude 200 mg/day is max possible benefit, that Pauling had specifically addressed 20 years earlier and yet Levine was saying "this is new info Pauling didn't have." It made national headlines. Levine should have first become aware of the existing literature.
Another example of the widely publicized anti-echinacea study from several years ago. They waited until patients had 3 symptoms before they were allowed to take it and concluded that it had no benefit. Well of course if you wait that long, you're already fully involved and nothing but Zicam will help. Those who took it had a 50% reduction in subsequent colds, but that was not considered important enough to relay in the media.
There never were any large scale studies showing an overall benefit of tocopherol. Recent evidence suggests that it is worthless at best and slightly detrimental at worst (depending on the model used).
Vitamin E was basically the first supplement strongly supported by someone, the shute brothers starting in the 1950s. Then came vitamin C. My bias in favor for vit E comes from Science News of the early 1990's. Every week they had a new positive study on it. I haven't looked into it recently, but I gave two examples out of many where the conclusion is just the opposite of the abstract if you carefully read the study. Now compare vitamin C and vitamin E to resveratrol. What studies do we have for humans ingesting resveratrol?
Now compare "new information" with what Linus Pauling published 23 years ago, probably recommeding 30+ years ago:
Don't smoke
Don't eat sugar, suggested paleolithic diet (he probably started the interest in that area)
moderate exercise
alcohol in moderate quantities appears to be good for you
avoid stress
7-8 hours sleep
get plenty of water
fruits and vegetables
eggs and meats are good food, don't pay attention to "cholesterol" in eggs
Vit C 6,000 to 18,000 mg/day in divided doses
vit D 800 IU (you can't hardly find a source at the time saying 400 IU was good)
vit E 400 to 1600 IU
vit A 25,000
vit B complex approx 50 to 100 (a rough summary of his numbers). This is probably the original source of B-50 and B-100 complexes.
A mineral supplement (minor quantities by modern standards for calcium, magnesium, and selenium. Better for zinc 15 mg, copper 1 mg, mang, moly, iodine)
He cited references that showed sugar had a higher correlation with heart disease than fat in different societies and in males subjected to fructose. These were the days when people were saying avoid ANY type of fat to reduce cholesterol. The sugar-heart disease correlation is still strong today based on country-by-country work I did with online databases.
By following these measures he expected average lifespan would increase 25 to 35 years and that someday someone might reach 150.
My point is that it took 10 to 20 years for the most knowledgeable people to get to Pauling's level concerning these things and I need to see some good references before I stop thinking 30,000 IU A and 800 IU E are good. He missed the boat in recommending vit C too much for colds (i have lots of personal experience with that) and not knowing 200 mcg selenium prevents 50% of cancer incidence, although this could be connected with vit E recycling which he has covered. This is not to say his specific info on vit C and colds was wrong: he talked about 1 g/hour reducing colds by only 25% to 50%. I agree with the 25%, and I can keep my nose completely dry during a cold, but just the effort of taking that much is hardly worth it. My experience is that it helps with symptoms due to its strong anti-histamine activity but does not seem to decrease duration. Vit D is much better at prevention and massive zicam pills and gel is a miracle for symptoms and duration (my colds last 6 to 12 hours). I take echinacea too, but I can't "measure" the benefit like i can with vit D and zicam.
The book I'm talking about is "How to Live Longer and Feel Better" published in 1986. I still haven't seen a better introduction to health and have found very few errors (too little selenium and vit D, and missing a few new things). His lowest recommended vitamin C in the book could be quoted as 6,000 mg, 2,600 mg, or 1,000 mg depending on which part you quote. He only specifically explained why 2,600 mg would be the lowest for the majority.
Edited by zawy, 13 May 2009 - 11:55 AM.