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Author Topic: What is the evidence that vitamins are good for you?  (Read 1946 times)

Offline thedoc

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Sallyann Child  asked the Naked Scientists:
   About all the negative things vitamins and related products:

Are there ANY scientifically proven facts supporting this?

Are vitamins really just a big fat con???!

Love your radio programme!

Regards.

Sallyann Child
Cape Town


What do you think?
« Last Edit: 06/10/2013 09:30:01 by _system »


 

Offline Bored chemist

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Re: What is the evidence that vitamins are good for you?
« Reply #1 on: 06/10/2013 13:25:34 »
The vitamins were discovered because if you don't get them you fall ill and die.
That's pretty good evidence.

The evidence for eating more than you need is, on the other hand, rather poor and at least one of the vitamins is used as a rat poison.
http://en.wikipedia.org/wiki/Cholecalciferol
 

Offline cheryl j

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Re: What is the evidence that vitamins are good for you?
« Reply #2 on: 06/10/2013 15:46:16 »
A lot of vitamins are co-factors (helper molecules) or  in enzymatic, chemical reactions, so if they are missing those reactions don't take place. Examples are the B vitamins and C.

In addition to their other roles, some vitamins are thought to be protective as antioxidants. An antioxidant prevents free radicals (an oxygen molecule with an extra electron) from reacting with other molecules and messing up their structure. But I don't know whether the research has shown that actually keeps people healthier.
 

Offline Mercury713

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Re: What is the evidence that vitamins are good for you?
« Reply #3 on: 31/10/2013 04:29:06 »
I take vitamins everyday by doctor recommendation. I just feel healthier taking them then when im not. So, if you need vitamins, use the coupons from newbielink:http://www.growingdeals.com/healthy-directions-coupons/ [nonactive] and get great deals like i do.
« Last Edit: 03/11/2013 06:32:54 by Mercury713 »
 

Offline RD

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Re: What is the evidence that vitamins are good for you?
« Reply #4 on: 31/10/2013 07:17:33 »
Some time ago I read that children who received multivitamin supplement [ initiated by their parents ] had better academic records. However double-blind studies show that such supplements are not responsible for their superior academic results http://www.ncbi.nlm.nih.gov/pubmed/20630168
 

Offline healthresearch

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Re: What is the evidence that vitamins are good for you?
« Reply #5 on: 02/11/2013 10:14:46 »
Vitamins got their name from vita = life, because they are vital, meaning necessary for life.

On the other hand, it is true that when you have enough vitamins in your body, the additional vitamins might not help much if at all.
 

Offline dlorde

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Re: What is the evidence that vitamins are good for you?
« Reply #6 on: 04/11/2013 17:33:03 »
Last I heard, there is no clear evidence that taking vitamin supplements has any benefit at all - unless you have a diagnosed deficiency (as shown by blood test) and are prescribed specific supplement(s). There is some evidence that 'general purpose' supplementation via pills, liquids, or capsules may do more harm than good, and that natural produce is a better source of absorbable vitamins than commercial supplement brands. Once you have sufficient, more isn't better, is sometimes worse, and you'll pee the surplus away anyhow.

If you can afford vitamin supplements, you're probably getting all you need in your diet anyway. If you're on a very poor diet (e.g. junk food with no fresh fruit or vegetables), eat fresh fruit and veg instead of supplements - they're much cheaper and better for you. Smoothies are not effective substitutes for whole fruit.

The same goes for antioxidants, but more so. Taking antioxidant supplements (many of which are vitamins) may actually increase your risk of mortality. See the updated Cochrane Review:
Quote from: Cochrane Review
We found no evidence to support antioxidant supplements for primary or secondary prevention. Beta-carotene and vitamin E seem to increase mortality, and so may higher doses of vitamin A. Antioxidant supplements need to be considered as medicinal products and should undergo sufficient evaluation before marketing.
« Last Edit: 04/11/2013 17:35:32 by dlorde »
 

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Re: What is the evidence that vitamins are good for you?
« Reply #6 on: 04/11/2013 17:33:03 »

 

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