Food groups and sources of nutrition can be broken down into smaller and smaller groups. In fact, in going to an extreme one could break all foods into the component end products. These end products are actually the way the body responds to the foods and uses the foods. Trying to keep things simple, it is actually better to speak in general terms using more broad strokes at this point; instead of the more detailed view.
The US government has spent and is spending a great deal of US tax dollars to learn about how and what makes the body function better. Included in these research efforts are investigations into which kinds of foods, nutritional sources, and exercises are beneficial to us. As research efforts improve with the advances their research efforts become more productive and are able to refine previous decade's recommendations. These advances will make for a healthier, happier and longer living human.
Governmental, hospital institution and university research councils over the years have made recommendations based upon the information that was available at the time. It is this basis upon which other studies are done. In performing these newer studies, there are times that we have learned that the ‘older' assumptions are proven incorrect or slightly misinterpreted because of the gaps or amounts of information available when the initial study was performed. This is how science works, it is constantly evolving. As these studies are always works in progress, it may be discovered that in near future another piece of the puzzle is found. That piece of the puzzle may serve to reinforce some nutritional recommendations while other pieces of the puzzle disprove other thoughts or recommendations.
The information that is presented is a collection of years and countless hours of cooperative efforts to learn more. It is in this spirit that Weight Awareness presents this data. It is our hope that we will stimulate further thoughts and improvements in those that take the time to learn more. This information is not new but rather written in a ‘reader friendly' manner so that more people can improve themselves.