Few topics in nutrition have undergone more dramatic reversals than fats. Butter was the traditional fat for centuries. In the 1960s-70s, it was demonized and replaced by "healthier" vegetable margarine. Then it was discovered that hydrogenated margarine contained dangerous trans fatty acids: a partial reintroduction of butter. Then coconut oil arrived as a miraculous natural "superfood." And now? Science has more nuanced answers than any food trend admits.

Butter: The Scientific Review of Recent Years

Butter is milk fat: approximately 80% fat (of which 65% saturated), water, proteins, and residual lactose, plus fat-soluble vitamins A, D, E, and K2. For decades, it was blamed for raising LDL cholesterol ("bad" cholesterol) and cardiovascular risk.

Research over the past 15 years has significantly revised these conclusions. A 2016 meta-analysis in Plos One (12 prospective studies, over 600,000 participants) found no significant association between butter consumption and cardiovascular mortality. Another 2017 meta-analysis in the European Journal of Clinical Nutrition suggested that moderate amounts of butter could even reduce the risk of type 2 diabetes.

The review of saturated fats' role in cardiovascular disease is still ongoing. The current research position: not all saturated fats are equal. Butyric acid and stearic acid (present in butter) have different metabolic behaviors from palmitic acid (the main one in lard or palm oil). Replacing butter with extra virgin olive oil remains a documented nutritionally superior choice, but butter is not the poison it was once believed to be.

Margarine: A Story of U-Shaped Reversal

Margarine was invented in the 19th century as an economical alternative to butter. Early modern versions used hydrogenation of vegetable oils to solidify them: this process created trans fatty acids (TFA), unsaturated fat molecules with altered geometric configuration. Industrial trans fats proved to be among the most dangerous fats for cardiovascular health: they raise LDL cholesterol and lower HDL ("good" cholesterol) more dramatically than saturated fats.

Since 2021, the European Union has set a maximum legal limit of 2g of trans fats per 100g of fat in food: in practice, it has almost eliminated industrial trans fats from the market. Modern European margarines use fractionation and interesterification processes instead of hydrogenation: they contain much less trans fat. Modern margarine (trans-free) is nutritionally different from that of the 1980s-90s.

High-quality modern margarine (rich in polyunsaturates, enriched with omega-3, trans-free): has a fatty acid profile theoretically more favorable than butter for cardiovascular health. But the nutritional complexity of butter (including vitamin K2, lactobacilli in fermented butter, bioactive compounds from dairy) cannot be replicated in an industrial product.

Coconut Oil: Between Myth and Reality

Virgin coconut oil is composed of approximately 90% saturated fat, mainly lauric acid (44%), caprylic, capric, and myristic acids. Its promotion as a "superfood" is based mainly on three arguments: medium-chain triglycerides (MCT) are metabolized differently from long-chain saturated fats; tropical populations consuming large amounts of coconut have low cardiovascular mortality; some research shows increased HDL.

The current scientific position is cautious. The American Heart Association in 2017 maintained its recommendation to limit overall saturated fats, including coconut oil, for cardiovascular risk reduction. Research on MCTs shows interesting but not definitive metabolic effects. Randomized clinical trials on coconut oil and cardiovascular risk are limited.

Honest conclusion: coconut oil is not the miracle described by marketing. It's not the poison described by those who reacted to marketing with opposite demonization. In moderate amounts in a varied diet, it's not problematic. As the main fat in your daily diet, extra virgin olive oil has much more robust evidence of benefits.

Practical Comparison: How to Choose

For daily use as a main condiment: extra virgin olive oil (evidence of benefit more solid than any other fat). For high-temperature cooking: peanut oil, EVO, refined coconut (stable). For sweet preparations where butter is traditional: butter in moderate amounts is acceptable in an overall balanced diet. For those wanting to reduce saturated fats: quality trans-free modern margarine is an acceptable alternative to butter. Virgin coconut oil: for adding exotic flavor to specific dishes, in moderate amounts.

The Practical Hierarchy of Cooking Fats

First choice for everything: quality extra virgin olive oil (raw and moderate-temperature cooking). Second choice for frying: peanut oil or high-oleic sunflower oil. For traditional sweet preparations: butter in moderate amounts, preferably from organic milk. Margarine: only certified trans-free versions if you prefer to avoid dairy. Coconut oil: for specific uses with exotic aromatic profile. Traditional hydrogenated margarine and palm oils: minimize.

How to Read Labels on Cooking Fats

On margarine: look for "trans fats: 0" or "<0.1g" per 100g. Check saturated fat content: if it exceeds 30% of total fats, it's not the healthiest. Look for "enriched with omega-3" or "high in oleic acid" as a quality signal. On butter: look for "organic" for the reasons already described (more omega-3 from grazing). "Cream butter" or "from milk" without other specifications is regular butter. On coconut oil: "virgin" or "extra virgin" indicates it hasn't been refined (retains aromas and some bioactive compounds). "Refined" has neutral taste, higher smoke point, fewer aromatic compounds.

Fermented Butter and Ghee: Two Variants Worth Knowing

Fermented butter (French beurre de baratte, kefir butter): made from cream fermented with lactic acid bacteria. It has more vitamin K2 (produced during fermentation), more complex and slightly acidic flavor, potentially better tolerability for those sensitive to lactose. Ghee (clarified butter): butter stripped of water, proteins, and lactose (excellent for those lactose intolerant), with a very high smoke point (250°C). Ayurvedic culinary tradition with millennia of use. Excellent for high-temperature cooking and for those who can't use regular butter.