The American diet, under more scrutiny than ever, continues to be debated, even as newly released federal nutrition guidelines attempt to codify for the confused how much of what foods we should eat. There are concerns about cholesterol and high-fat foods, reports on the glycemic index, a renewed emphasis on whole grains and a return to recognizing that calories do count. One of the latest discussions to emerge centers around milk and dairy products as key sources of calcium needed to build strong bones and prevent osteoporosis.