Citizens should definitely think for themselves, but the producers and sellers of food need to be honest about what they actually put into food, and has an obligation not to add things that are destructive to general health.
When I buy bread, I check the content - and buy bread with flour, water, salt and leaven or yeast only.
When I buy dairy products like sour cream I check that no carrageen guar carob gums are added. If the reading of content takes me more that few seconds I do not buy it.
Still it is possible because of government regulations which insure that the content is displayed properly.
Could you imagine the sales plunge if ingrediants had to be explained in PLAIN ENGLISH!
Why those products that use euphamisms for MSG would gain dust on the shelves!