Why is it important to make fat-free or low-fat choices from the Dairy Group? (from choosemyplate.gov)

Why is it important to make fat-free or low-fat choices from the Dairy Group?

Choosing foods from the Dairy Group that are high in saturated fats and cholesterol can have health implications. Diets high in saturated fats raise "bad" cholesterol levels in the blood. The "bad" cholesterol is called LDL (low-density lipoprotein) cholesterol. High LDL cholesterol, in turn, increases the risk for coronary heart disease. 

Many cheeses, whole milk, and products made from them are high in saturated fat. To help keep blood cholesterol levels healthy, limit the amount of these foods you eat. In addition, a high intake of fats makes it difficult to avoid consuming more calories than are needed.

Info source: http://www.choosemyplate.gov/food-groups/oils-why.html