I have a chart from Liz Cook in my kitchen which I find very useful. It's about different nutrients your body needs, and what foods contain them. I also have charts by her about natural cleaning products and natural first aid remedies. I refer to them often because they are constantly on display rather than in a book tucked away on a shelf somewhere.
Although it only lists vegan foods, you don't have to be a vegan to find Liz's nutrition chart useful. I mainly use it as a reminder about what foods we're not eating. I'll look at the chart and think "We haven't had Brazil nuts for ages", then go and buy some. It helps us make sure there aren't any gaps in our diet. It is also a daily reminder that food isn't just about convenience, or simply a way to stop hunger pangs, but it is a central part of keeping healthy and avoiding illness.
I also love the way they look. They look hand-made (which they are) with hand-drawn lettering and little drawings of fruits and vegetables. They make me smile when I see them stuck up in my kitchen, and whenever I see them elsewhere, I know there is someone around that I have something in common with.
You may be wondering why this is written as a book review when it is about a series of wallcharts. Well, each chart has an ISBN number and you can buy them from Amazon, or directly from Liz's website.