Margarine usually tops butter when it comes to heart health.

Margarine is made from vegetable oils, so it contains no cholesterol. Margarine is also higher in "good" fats — polyunsaturated and monounsaturated — than butter is. These types of fat help reduce low-density lipoprotein (LDL), or "bad," cholesterol, when substituted for saturated fat. Butter, on the other hand, is made from animal fat, so it contains cholesterol and high levels of saturated fat.

But not all margarines are created equal — and some may even be worse than butter. Most margarines are processed using a method called hydrogenation, which adds unhealthy trans fats. In general, the more solid the margarine, the more trans fats it contains — so stick margarines usually have more trans fats than do tub margarines. Like saturated fats, trans fats increase blood cholesterol and the risk of heart disease. In addition, trans fats can lower high-density lipoprotein (HDL), or "good," cholesterol levels.

When choosing a margarine, try to find one with the lowest trans fat content possible and less than 3 grams total of saturated plus trans fats. Manufacturers are now required to list saturated and trans fats separately on food labels.

There are also spreads — such as Benecol and Take Control — that contain phytosterols, natural plant compounds that have been shown to reduce LDL cholesterol levels by 6 percent to 15 percent when eaten in recommended amounts.