Well, slap yourself on the back. One reason that you may have known it was the 5-a-day program that was sponsored back then by the government. Eat 5 portions of fruits or vegetables every day. It didn't say, don't eat something, which always gets the lobbyists up in a lather. But after showing marked improvements in nutrition for a very small promotional budget, the program was de-funded. You can read more about it, if you wish, in "Food Politics: How the Food Industry Influences Nutrition, and Health" by Marion Nestle.
Knowledge is based on accessibility. Impeding it doesn't help anyone except, those who prey on ignorance. As a student I found that I needed to read a book three times before I truly understood it. Then again, not all books are for all people. So where do you get your nutritional information Cheryl, divine revelation, natural smarts, media, or books. If books, which ones? I'm also interested in what enigma said s/he was reading.
There seems to be a strong general need for this information, otherwise nutritional/ecological/moral books wouldn't be selling as strongly as they have. I'm sure this is at least in part a response to America's medical profile of being obese, prone to cardiovascular disease, fatigued, and more and more, type II diabetic.