Which type of fat is most calorie-dense?

Trans fats are considered the most calorie-dense type of fat because they are typically created through an industrial process that adds hydrogen to liquid vegetable oils, making them more solid and shelf-stable. This process increases their density and calorie content without adding beneficial nutrients.

In general, all fats, regardless of type, provide approximately 9 calories per gram; however, trans fats have been associated with negative health impacts, such as increased risk of heart disease, which may relate to their consumption patterns rather than their caloric density alone.

While saturated fats, polyunsaturated fats, and monounsaturated fats also contain about 9 calories per gram, they do not have the same detrimental health implications as trans fats. Thus, while the caloric content is similar across different types of fats, the association of trans fats with negative health effects makes them stand out in contexts concerning dietary recommendations and health implications.