The reality of functional foods

In my opinion, the functional foods are foods that contain nutrients that with special function about health (maybe some of them could prevent certain disease but most of them are not proven by authoritative scientists or bureau like USDA). In reality, I have accepted the concept of functional food for decades from many advertisements on TV. J, now, do you think if the functional foods could really play positive effects on health? I think yes.

There are really some functional foods around us which are useful but few impressed by us. For example, the dark green and red or orange vegetables are good functional foods, because they contain a lot of carotenoids, which can neutralize free radicals and protect against vision problems and skin cancers, but the research of the mechanism of its function is now underway. Besides, the berries, red wine and tea are also functional foods because they contain a lot of flavonoids which can also decrease the amount of free radicals.