There is archaeological evidence to show that the Chinese have been studying foods and herbs for well over three thousand years. During that time, they refined and perfected a great system.
It is entirely different to the Western way of counting calories and dividing our foods into groups of carbohydrates, proteins and fats. It is instead very practical and useful in altering states and conditions, and even in treating and resolving illnesses in your body.
Once you understand the Chinese method, you can start to see why there are many flaws in current Western nutritional theories.
The Western approach is nearly always to break foods down into smaller and smaller isolated chemicals, which are then categorized into similar groups. When you do this many elements start to appear to have the same qualities. However on the bigger level, the problem with this is quite clear.