Butter is a dairy product traditionally made from milk. Original butter contains CLA, a type of fat that may have cancer-fighting properties, help reduce body fat, and improve immune function. Butter is a high-energy food, containing approximately 715 calories per 100 grams. It has a high content of butterfat, or milk fat (at least 80 percent). It's rich in nutrients like bone-building calcium and contains compounds linked to lower chances of obesity. Butter can also be part of a low-carbohydrate diet, which may help people better maintain their weight or lose weight quicker than they would with a low-fat diet.