One gram of fat contains 9 calories, which is more than double the amount of calories in a gram of protein or carbohydrate. This makes fat a very concentrated source of energy. However, not all fats are created equal. Saturated fats, which are found in animal products and some plant oils, tend to be solid at room temperature while unsaturated fats, which are found in most plant oils, are liquid. Both types of fat have the same number of calories per gram, but saturated fats have been linked with higher levels of LDL (“bad”) cholesterol and an increased risk for heart disease while unsaturated fats have been shown to improve HDL (“good”) cholesterol levels and may help lower the risk for heart disease.