Modern margarine is not bad for you, and in most formulations it’s a reasonable alternative to butter. The product that earned margarine its unhealthy reputation, the trans fat-laden stick margarine of the 20th century, essentially no longer exists in the U.S. market. Since the FDA banned partially hydrogenated oils with a final compliance date of January 2020, leading margarine brands contain no significant amount of trans fat. What you find on shelves today is a fundamentally different product from what your parents or grandparents spread on toast.
That said, not all margarines are equal. The type you choose, the oils it’s made from, and whether it’s a stick or a tub all matter for your health.
Why Margarine Got a Bad Reputation
For decades, manufacturers made margarine solid by partially hydrogenating vegetable oils, a process that adds hydrogen to liquid oils to make them firm at room temperature. The byproduct of that process was artificial trans fat, which raises LDL (“bad”) cholesterol, lowers HDL (“good”) cholesterol, and increases the risk of heart disease. Stick margarines were especially high in trans fat because they needed more hydrogenation to hold their shape.
In January 2006, the FDA began requiring trans fat to appear on Nutrition Facts labels. By 2015, the agency declared partially hydrogenated oils no longer safe for use in food. Manufacturers had until 2020 to fully reformulate their products. A 2023 analysis of leading U.S. margarine brands confirmed that all products now contain no or negligible amounts of trans fat. The ingredient that made margarine harmful is gone.
How Margarine Is Made Now
With partial hydrogenation off the table, manufacturers turned to a process called interesterification. Instead of adding hydrogen, this technique rearranges the fatty acids within the oils to change their melting point and texture. The result is a spreadable fat without artificial trans fat, and one that typically contains about 10% less saturated fat than a non-interesterified fat with similar firmness.
The long-term health effects of interesterified fats aren’t fully understood yet. Most studies have found they either reduce or don’t change blood fat levels after a meal compared to their non-interesterified equivalents. One study using a commercially relevant palm-based blend did find a temporary increase in blood fats after eating, which contradicted earlier research done with fats rarely used in actual food products. The evidence so far doesn’t raise major red flags, but it’s an area where the science is still catching up to what’s already on grocery shelves.
Margarine vs. Butter for Heart Health
Large-scale data from the Nurses’ Health Study estimated what happens when people swap one teaspoon of butter per day for different types of margarine. Replacing butter with soft tub margarine was associated with an 8% lower risk of heart attack among women who used a single type of spread consistently. Replacing butter with stick margarine showed no meaningful benefit. Low-fat margarine fell somewhere in between, with no statistically significant difference from butter for heart attack, coronary heart disease, or stroke.
Switching from stick margarine to tub margarine was associated with a 9% lower risk of heart attack. The pattern is consistent: softer margarine products tend to have less saturated fat and a more favorable fat profile. The Mayo Clinic’s current guidance is straightforward: skip the stick and choose soft or liquid margarine, ideally one with less than 10% of the daily value for saturated fat per serving.
The Oils Inside Matter
Margarine is made from vegetable oils, but which oils varies widely by brand. Common sources include soybean, canola, corn, sunflower, and safflower oil. This matters because many of these oils are very high in omega-6 fatty acids relative to omega-3s. Corn oil has an omega-6 to omega-3 ratio of roughly 60:1, and safflower oil is around 77:1. Soybean oil is more moderate but still omega-6 dominant.
A high intake of omega-6 fats relative to omega-3s is linked to increased inflammation, which over time may contribute to chronic disease. If you eat margarine regularly, choosing one made with canola oil or one that lists a higher omega-3 content can help keep that ratio in better balance. Some brands now highlight their omega-3 content on the label for this reason.
Sterol-Fortified Spreads
Some margarines are fortified with plant sterols or stanols, compounds naturally found in small amounts in grains, nuts, and vegetables. These work by blocking cholesterol absorption in the gut. At doses of 2 grams per day or more, plant sterol-enriched spreads reduce LDL cholesterol by 9% to 14%, depending on age. The effect is strongest in older adults: people aged 50 to 59 saw an average LDL reduction of about 21 mg/dL, while those aged 30 to 39 saw a drop of about 13 mg/dL.
These fortified spreads are one of the few food-based interventions with consistent evidence for lowering cholesterol. They’re not a substitute for medication in people with significantly elevated cholesterol, but for someone looking to make a modest dietary improvement, they’re a practical option.
Additives and Emulsifiers
Margarine contains emulsifiers to keep its water and oil components from separating. The most common is mono- and diglycerides of fatty acids, found in thousands of processed food products. Your digestive system breaks these down into glycerol and fatty acids, the same components you’d get from digesting any fat. The European Food Safety Authority reviewed this additive and noted that while some other emulsifiers have been shown to alter gut bacteria and promote gut inflammation in animal studies, no specific research has examined whether mono- and diglycerides have the same effect.
This is a gap in the research rather than evidence of harm. If the presence of emulsifiers concerns you, some margarine brands use simpler ingredient lists than others, and a few marketed as “clean label” minimize added emulsifiers.
How to Choose a Healthier Margarine
- Pick tub or liquid over stick. Softer margarines have less saturated fat and are associated with modestly better cardiovascular outcomes than stick forms.
- Check the saturated fat. Look for products with less than 2 grams of saturated fat per serving, or under 10% of the daily value.
- Look at the oil source. Canola-based margarines tend to have a better omega-6 to omega-3 balance than those made primarily from corn, sunflower, or safflower oil.
- Consider sterol-fortified options. If you’re trying to lower your LDL cholesterol through diet, a spread with added plant sterols can make a measurable difference at about 2 grams of sterols per day.
- Read past the front label. Terms like “heart healthy” or “light” are marketing claims. The Nutrition Facts panel and ingredient list tell you what’s actually in the product.