The truth about what the human body requires to be healthy and happy is more complex than we're often taught through conventional channels.
Sadly, too often the entire subject is reduced to what is and what isn't on a little nutrition label on the back of a box, and that's the end of it. Meanwhile, the true scope of bodily nutrition spans dozens of vitamins and minerals, and hundreds of other compounds, such as phyto-nutrients and amino acids.
Why these topics don't come into play when discussing nutrition likely can be attributed to the fact that some of it is simply arcane. We like handy lettered Vitamins like C and D, and easy to remember bad guys, like Cholesterol and Fat. Nutrition, though, defies these trite labels. In fact, such simplication may be one of the factors that has led to poor health in much of the industrialized world overall.