Butterfat or milkfat is the

fat In nutrition, biology, and chemistry, fat usually means any ester of fatty acids, or a mixture of such compounds, most commonly those that occur in living beings or in food. The term often refers specifically to triglycerides (triple est ...

ty portion of

milk Milk is a white liquid food produced by the mammary glands of mammals. It is the primary source of nutrition for young mammals (including breastfed human infants) before they are able to digest solid food. Immune factors and immune-modula ...

. Milk and

cream Cream is a dairy product composed of the higher-fat layer skimmed from the top of milk before homogenization. In un-homogenized milk, the fat, which is less dense, eventually rises to the top. In the industrial production of cream, this process ...

are often sold according to the amount of butterfat they contain.

Composition

Butterfat is mainly composed of

triglyceride A triglyceride (TG, triacylglycerol, TAG, or triacylglyceride) is an ester derived from glycerol and three fatty acids (from ''wikt:tri-#Prefix, tri-'' and ''glyceride''). Triglycerides are the main constituents of body fat in humans and other ...

s. Each triglyceride contains three

fatty acid In chemistry, particularly in biochemistry, a fatty acid is a carboxylic acid with an aliphatic chain, which is either saturated or unsaturated. Most naturally occurring fatty acids have an unbranched chain of an even number of carbon atoms, ...

s. Butterfat triglycerides contain the following amounts of fatty acids (by mass fraction):The quote values vary by 1–3% according to the source: Butterfat contains about 3%

trans fat Trans fat, also called trans-unsaturated fatty acids, or trans fatty acids, is a type of unsaturated fat that naturally occurs in small amounts in meat and milk fat. It became widely produced as an unintentional byproduct in the industrial pr ...

, which is slightly less than 0.5 grams per US tablespoon. Trans fats occur naturally in meat and milk from

ruminant Ruminants (suborder Ruminantia) are hoofed herbivorous grazing or browsing mammals that are able to acquire nutrients from plant-based food by fermenting it in a specialized stomach prior to digestion, principally through microbial actions. The ...

s. The predominant kind of trans fat found in milk is vaccenic fatty acid. Trans fats may be also found in some industrially produced foods, such as shortenings obtained by hydrogenation of

vegetable oil Vegetable oils, or vegetable fats, are oils extracted from seeds or from other parts of fruits. Like animal fats, vegetable fats are ''mixtures'' of triglycerides. Soybean oil, grape seed oil, and cocoa butter are examples of seed oils, or f ...

s. In light of recognized scientific evidence, nutritional authorities consider all trans fats equally harmful for health and recommend that their consumption be reduced to trace amounts. However, two Canadian studies have shown that

vaccenic acid Vaccenic acid is a naturally occurring trans fatty acid. It is the predominant kind of trans-fatty acid found in human milk, in the fat of ruminants, and in dairy products such as milk, butter, and yogurt. Trans fat in human milk may depend on tr ...

could be beneficial compared to vegetable

shortening Shortening is any fat that is a solid at room temperature and used to make crumbly pastry and other food products. Although butter is solid at room temperature and is frequently used in making pastry, the term ''shortening'' seldom refers to b ...

s containing trans fats, or a mixture of pork lard and soy fat, by lowering total

LDL Low-density lipoprotein (LDL) is one of the five major groups of lipoprotein that transport all fat molecules around the body in extracellular water. These groups, from least dense to most dense, are chylomicrons (aka ULDL by the overall densit ...

and triglyceride levels. A study by the US Department of Agriculture showed that vaccenic acid raises both HDL and LDL cholesterol, whereas industrial trans fats only raise LDL with no beneficial effect on HDL.

U.S. standards

In the

U.S. The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...

, there are federal standards for butterfat content of

dairy products Dairy products or milk products, also known as lacticinia, are food products made from (or containing) milk. The most common dairy animals are cow, water buffalo, nanny goat, and ewe. Dairy products include common grocery store food items in ...

.USDA Commercial Item Description: Cream, Eggnog, Half-and-half, and Sour Cream
(2002). Many other countries also have standards for minimum fat levels in dairy products. Commercial products generally contain the minimum legal amount of fat with any excess being removed to make cream, a valuable commodity. *

Milk Milk is a white liquid food produced by the mammary glands of mammals. It is the primary source of nutrition for young mammals (including breastfed human infants) before they are able to digest solid food. Immune factors and immune-modula ...

s **

Non-fat milk Skimmed milk (British English), or skim milk (American English), is made when all the milkfat is removed from whole milk. It tends to contain around 0.1% fat. Background Historically, skimmed milk was used for fattening pigs, and was recommended ...

, also labeled "fat-free milk" or "skim milk", contains less than 0.5% fat **

Low-fat milk The fat content of milk is the proportion of milk, by weight, made up by butterfat. The fat content, particularly of cow's milk, is modified to make a variety of products. The fat content of milk is usually stated on the container, and the color ...

is 1% fat **

Reduced-fat milk Milk is a white liquid food produced by the mammary glands of mammals. It is the primary source of nutrition for young mammals (including breastfed human infants) before they are able to digest solid food. Immune factors and immune-modulating ...

is 2% fat **

Whole milk Milk is a white liquid food produced by the mammary glands of mammals. It is the primary source of nutrition for young mammals (including breastfed human infants) before they are able to digest solid food. Immune factors and immune-modulating ...

contains at least 3.25% fat * Cheeses ** Dry

curd Curd is obtained by coagulating milk in a sequential process called curdling. It can be a final dairy product or the first stage in cheesemaking. The coagulation can be caused by adding rennet or any edible acidic substance such as l ...

and nonfat

cottage cheese Cottage cheese is a curdled milk product with a mild flavor and a creamy, non-homogeneous, soupy texture. It is made from skimmed milk by draining the cheese, as opposed to pressing it to make cheese curd—retaining some of the whey and keep ...

contain less than 0.5% fat ** Lowfat cottage cheese contains 0.5–2% fat ** Cottage cheese contains at least 4% fat **

Swiss cheese Swiss cheese may refer to: Cheese * List of Swiss cheeses (from Switzerland) * Swiss-type cheeses or Alpine cheeses, a class of cooked pressed cheeses now made in many countries * Swiss cheese (North America), any of several related varieties o ...

contains at least 43% fat relative to the total solids ** Cheddar cheese contains at least 50% fat relative to the total solids * Frozen desserts ** sherbet contains 1–2% fat ** Lowfat ice cream, also called

ice milk Ice milk, or iced milk, is a frozen dessert with less than 10 percent milk fat and the same sweetener content as ice cream. Ice milk is sometimes priced lower than ice cream. A 1994 change in United States Food and Drug Administration rules all ...

, contains no more than 2.6% fat **

Ice cream Ice cream is a sweetened frozen food typically eaten as a snack or dessert. It may be made from milk or cream and is flavoured with a sweetener, either sugar or an alternative, and a spice, such as cocoa or vanilla, or with fruit such as ...

contains at least 10% fat **

Frozen custard Frozen custard is a cold dessert similar to ice cream, but made with eggs in addition to cream and sugar. It is usually kept at a warmer temperature compared to ice cream, and typically has a denser consistency. History Egg yolks have been int ...

, like ice cream, contains at least 10% fat, but it also must contain at least 1.4% egg yolk solids *

Cream Cream is a dairy product composed of the higher-fat layer skimmed from the top of milk before homogenization. In un-homogenized milk, the fat, which is less dense, eventually rises to the top. In the industrial production of cream, this process ...

s **

Half and half "Half and half" is the name of various beverages and foods made of an equal-parts mixture of two substances, including dairy products, alcoholic beverages, and soft drinks. Alcoholic beverages Belgium In some cafés in Brussels, a "half en ...

contains 10.5–18% fat ** Light cream and

sour cream Sour cream (in North American English, Australian English and New Zealand English) or soured cream (British English) is a dairy product obtained by fermenting regular cream with certain kinds of lactic acid bacteria. The bacterial culture, ...

contain 18–30% fat ** Light whipping cream (often called simply "whipping cream") contains 30–36% fat **

Heavy cream Cream is a dairy product composed of the higher-fat layer skimmed from the top of milk before homogenization. In un-homogenized milk, the fat, which is less dense, eventually rises to the top. In the industrial production of cream, this proces ...

contains a minimum of 36% fat ** Manufacturer's cream (not federally regulated) contains 40% fat *

Butter Butter is a dairy product made from the fat and protein components of churned cream. It is a semi-solid emulsion at room temperature, consisting of approximately 80% butterfat. It is used at room temperature as a spread, melted as a condimen ...

(including whipped butter) contains at least 80% fat

References

{{Authority control Dairy products Food ingredients Butter

Composition

U.S. standards

See also

References