I'm currently studying nutritional therapy and this is an area of interest. To be honest it's best to seek advice even with vitamins - like everything else you get what you pay for and tub of vit C from a supermarket brand can be very different from another brand designed for theraputic use - yes they contain vitamin C but it's the binders, formers used, how it's made and designed to deliver the vitamin that counts.
There's been some reports in the press about how taking vits and stuff can be bad but as with everything else try and do some background research before you're swayed about this being true or not. Indeed some recent papers reviewing the effectiveness of antioxidants actually reviewed less than 9% of the available research to show these findings.
Remember the headline is never the whole story.
As has been said eating a varied
and healthy diet is the best thing you can do to fuel your body however as with low grade fuel in the overlander low grade food will affect the running of your engine.
Be mindfull of where you are in the world as certain parts of this world we travel have to little or to much of a particular nutrient. Not so much of a problem short term of course but something to bear in mind. So this is an area where a good quality
supplement may help.
And look at where your local fruit and veg is grown? Pollution can be a problem. Washing it before cooking it helps but think about where the water comes from too if it's from the river flowing past the ACME Chemical Plant there may not be much point....I know it sounds like I'm saying stay at home but I'm not
(there's just as many things at home that can do you harm as abroad
We need to eat and eating local is best however all I'm saying is that you should think about what you fill your face with....