The 6-a-day study: effects of fruit and vegetables on markers of oxidative stress and antioxidative defense in healthy nonsmokers.
The abstract is here and the whole study is available here
In addition to some interesting commentary on the whole area of antioxidants, some of which may now be a bit out of date, the conclusion is that : Fruit and vegetables increase erythrocyte glutathione peroxidase activity and resistance of plasma lipoproteins to oxidation more efficiently than do the vitamins and minerals that fruit and vegetables are known to contain.
It is the WHOLE FOOD that is important, not the elements of it. You could take habdfuls of supplements to mimic the content of liver or an apple, yet never gain the nutrional benefits that would come from the real, whole foods. It is not complicated, but it is worth noting.
(Thanks to Mike for pointing this study out, and congrats on the newbaby)