As with many nutrition questions, there is no exact answer. Consider the facts, then use the product that makes the most sense for a healthy diet for you and your family. Let's compare how these two foods are alike and different. Margarine is the same. Butter and margarine manufacturers have developed lower-calorie products.
Whipped butter has air forced in among the fat molecules to produce a foam.
The air reduces the number of calories per serving, though not per ounce. These products can reduce calorie and fat content by 50 percent or more. They work well for spreading on breads, but not for cooking or baking. A serving of butter contributes 8 percent of the daily recommendation of vitamin A as well as traces of vitamin D, protein and carbohydrates. Saturated fats are associated with increased levels of cholesterol in the body.