Butter is a popular dairy product made from cow's milk.

It is composed of milk fat that has been separated from other milk components. It has a rich flavour and is widely used for cooking, baking, or as a spread on bread.

In the past few decades, butter has been unfairly blamed for cardiovascular disease due to its high saturated fat content.

However, the public and scientific opinion has been slowly shifting in its favor, and many people now consider butter to be healthy.

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Being mainly composed of fat, butter is a high-calorie food. One tablespoon of butter contains about 101 calories, which is similar to one medium-sized banana.

The table below contains detailed information on the different nutrients in butter.

Nutrition Facts: Butter, Salted — 100 grams

Water16 %
Protein0.9 g
Carbs0.1 g
Sugar0.1 g
Fiber0 g
Fat81.1 g
Saturated51.37 g
Monounsaturated21.02 g
Polyunsaturated3.04 g
Omega-30.32 g
Omega-62.17 g
Trans fat3.28 g

Butter is about 80% fat, and the rest is mostly water.

Basically, it is the fatty portion of milk that has been isolated from the protein and carbs.

Butter is one of the most complex of all dietary fats, containing more than 400 different fatty acids.

It is very high in saturated (about 70%) fatty acids, and contains a fair amount of monounsaturated fatty acids (about 25%).

Polyunsaturated fats are only present in minimal amounts, constituting around 2.3% of the total fat content (, ).

Other types of fatty substances found in butter include cholesterol and phospholipids.

Short-Chain Fats

Around 11% of the saturated fatty acids in butter are short-chain (), the most common of which is butyric acid.

Butyric acid is a unique component of the milk fat of ruminant animals, such as cattle, sheep and goats.

Butyrate, which is a form of butyric acid, has been shown to reduce inflammation in the digestive system and has been used as a treatment for Crohn's disease ().

Ruminant Trans Fats

Unlike trans fats in processed foods, dairy trans fats are considered to be healthy.

Butter is the richest dietary source of dairy trans fats, also called ruminant trans fats, the most common of which are vaccenic acid and conjugated linoleic acid or CLA (4).

CLA is a family of trans fats that has been associated with various health benefits ().

Studies in animals, and human cells in laboratory culture, indicate that CLA may protect against certain types of cancer (, , ).

CLA may also promote weight loss in humans (), and is actually sold as a weight loss supplement. However, not all studies support this ().

In addition, there are some concerns with large doses of CLA supplements as they may have harmful effects on metabolic health (, ).

Bottom Line: Butter is mainly composed of fat. The types of fat include saturated fat, monounsaturated fat, and ruminant trans fats.

Butter is a rich source of several vitamins, especially those that are generally associated with fat.

The following vitamins are found in high amounts in butter:

  • Vitamin A: The most abundant vitamin in butter. One tablespoon (14 g) can provide about 11% of the daily recommended allowance ().
  • Vitamin D: Butter is a good source of vitamin D.
  • Vitamin E: A powerful antioxidant, often found in fatty foods.
  • Vitamin B12: Also called cobalamin, vitamin B12 is only found in foods of animal origin, such as eggs, meat, and dairy products.
  • Vitamin K2: A form of vitamin K, also called menaquinone. May protect against cardiovascular disease and osteoporosis (, , ).

However, butter doesn't contribute much to the total daily intake of these vitamins because it is usually consumed in small amounts.

Bottom Line: Butter is rich in various vitamins. These include vitamins A, D, E, B12, and K2.

A few years ago, butter was considered to be unhealthy, mostly due to the high saturated fat content.

However, the public and scientific opinion is slowly shifting in favor of butter consumption.

Cardiovascular Health

Cardiovascular disease is one of the leading causes of death in modern society.

The relationship between saturated fats and cardiovascular disease has been a controversial topic for several decades (, 17, , ).

It is well known that a high intake of saturated fat can increase levels of cholesterol in the blood (), which is a risk factor for cardiovascular disease.

However, it is not necessarily the amount of cholesterol that is a cause for concern. The blood lipid profile, or the type of lipoprotein cholesterol is carried around in, is much more important.

Intake of saturated fats can actually improve the blood lipid profile in many ways:

  • They raise levels of high-density lipoprotein (HDL), the "good" cholesterol, which is associated with a reduced risk of cardiovascular disease (, ).
  • They may increase levels of low-density lipoproteins (LDL) somewhat, but they are converting them into large LDL particles, which are not associated with cardiovascular disease (, ).

Many studies have failed to find a link between saturated fat intake and cardiovascular disease (, , ).

The same applies to high-fat dairy products, such as butter. Studies have shown that high-fat dairy products do not increase the risk of cardiovascular disease ().

In fact, many studies have actually found the intake of high-fat dairy products to be beneficial for cardiovascular health (, , ).

However, most of the studies used "regular" amounts. It is possible that consuming large amounts (for example, adding butter to your coffee) can be problematic.

Bottom Line:

As a rich source of saturated fat, butter has been blamed for increasing the risk of heart disease. However, considerable evidence points to the contrary.


Many people believe that butter is fattening because it is high in fat and calories.

However, this doesn't seem to be true when butter is eaten in normal amounts, as a part of a healthy diet. A review of the evidence found that high-fat dairy products (like butter) were linked to a reduced risk of obesity (30).

That being said, butter is not a food that should be consumed in large amounts.

It is almost pure fat and should only be used to complement meals, as a cooking fat or spread, or as a part of recipes.

In other words, butter should be eaten with a meal, not as the meal.

Bottom Line: Although butter is a high-fat food, it does not seem to promote weight gain when eaten in normal amounts as a part of a healthy diet.

In conventional amounts, butter does not have many known adverse health effects.

However, eating butter in large amounts may very well lead to weight gain and associated health problems, especially in the context of a high calorie diet.

Milk Allergy

Although butter is very low in protein, it still contains enough of the allergenic whey proteins to cause reactions.

Therefore, people with milk allergy should be careful with butter, or avoid it altogether.

Lactose Intolerance

Butter contains only trace amounts of lactose, so moderate consumption should be safe for most lactose intolerant people.

Cultured butter (made from fermented milk) and clarified butter contain even less lactose and may be more suitable.

Bottom Line: Butter is generally healthy, but it may contribute to weight gain when eaten in excess. Butter is low in lactose, so moderate amounts should be safe for most people with lactose intolerance..

The feed of dairy cows can have a considerable effect on the nutritional quality.

Grass-fed butter is made from the milk of cows that graze on pasture or are fed fresh grass.

In the US, grass-fed dairy products are just a tiny portion of the dairy sector (31). Most dairy cows are mainly fed with commercial grain-based feeds.

In many other countries, such as Ireland and New Zealand, grass-fed milk products are much more common, at least during the summer months.

Grass-fed butter is higher in many nutrients than butter from cows that are fed processed, grain-based feeds or conserved grass ().

A higher proportion of fresh grass in a cow's diet increases the amount of healthy fats, such as omega-3 fatty acids and conjugated linoleic acid (, , , 35, 36).

In addition, the content of fat-soluble vitamins and antioxidants, such as carotenoids and tocopherols, is significantly higher in grass-fed dairy (37, 38).

Put simply, butter from grass-fed cows is a much healthier choice.

Bottom Line: Butter from grass-fed cows is higher in many nutrients than butter from grain-fed cows.

The first step in the production of butter involves separating the cream from the milk.

In the past, milk was simply left standing until the cream rose to the surface, from where it was skimmed.

This happens because fat is lighter than the other milk components.

Modern production of cream involves a more efficient method called centrifugation.

In the next step, butter is produced from cream in a process called churning.

Churning involves shaking the cream until the milk fat (butter) clumps together and separates from the liquid portion (buttermilk).

When the buttermilk has been drained off, the butter is churned further until it becomes ready for packaging.

Butter is a milk product produced from milk fat.

It is mainly composed of fat, but is also a rich source of many vitamins, especially vitamins A, E, D, and K2.

However, butter is almost pure fat, and is not particularly nutritious when considering the high amount of calories.

Due to its high saturated fat content, it has been blamed for increased risk for overweight and heart disease.

However, several studies point to the contrary. Moderate consumption of butter may actually have a number of health benefits.

At the end of the day, butter may be healthy in moderation, but excessive consumption should be avoided.