The advice you get there is a political consensus, not a scientific one. Have a look at http://www.choosemyplate.gov/, linked directly from health.gov: You will have a hard time finding a recommendation against any food product. The non-obvious trick used to appease the food industry is basing the recommendations on nutrients and ingredients, allowing the industry to push their "Any food product can be part of a balanced diet" myth, and reengineer the processed food so that they can put whatever nutrient or ingredient is considered healthy right now on the labels.
