Bacon has an ancient history. The domestication of "pigs" (immature hogs) for food dates back to about 7000 B.C. in the Middle East. Some historians say that bacon made from hogs was a favorite of the early Romans and Greeks. About 500 years ago, bacon or bacoun (a Middle English term) referred to all pork. The term derived from bako (French), bakkon (Germanic) and backe (Old Teutonic) that refer to the "back" of the hog.

European peasants in the 1500's couldn't afford to buy pork often. It was a sign of affluence if a man could "bring home the bacon." They would cut off some for guests and sit around "chewing the fat," now a colloquial term for "having a discussion." The term "bringing home the bacon" now means "earning a living" or "being successful."

Bacon is made in many countries of the world. In Germany, it is called speck; Netherlands, spek; France, lard or bacon; Italy, pancetta; and Spain, tocino or tocineta. It can be made from several different animal species including pork, turkey and beef. Bacon can also be made from various parts of an animal; thus, its appearance can vary.

The term "bacon" is used to describe the cured belly of a swine (hog) carcass. If meat from other portions of the carcass is used, the product name must identify the portions where the bacon comes from, e.g., "pork shoulder bacon." Bacon is generally produced from young animals 6 to 7 months old, that weigh between 175 to 240 pounds.

Pork bacon without any other descriptors is raw or uncooked, and must be cooked before eating. Most bacon sold in the United States is "streaky" bacon, long narrow slices cut crosswise from the hog belly that contain veins of pink meat within white fat. Unless otherwise noted, the information in this publication refers to "streaky" bacon.

In addition to "streaky" bacon, other U.S. favorites are American-style Canadian bacon (round slices of pink meat from the loin), turkey bacon made from light and dark turkey meat, and beef bacon prepared from various beef cuts. See the "Glossary of Bacon Terms", found at the end of this publication, for definitions.

Several steps are involved in producing sliced bacon. First each pork belly is skinned, and any ragged edges trimmed. After curing with salt and nitrite, the pork bellies are heat processed. Mass-produced bacon is heat processed in large convection ovens. It is much faster to mass produce bacon using a convection oven (as little as 6 hours) than by traditional smoking (many days).

Bacon receives its smoke flavor from natural smoke obtained by smoldering wood chips or by spraying the bacon with a liquid smoke extract.

After heat processing and smoking, the bacon must be chilled to below 40 degrees before it is sliced. Most bacon is sliced before packaging. Because of the added salt and nitrite, bacon is far less perishable than other raw meat products. Even so, the chilling is done quickly to prevent bacterial growth and promote its shelf-life.

According to the Food Safety and Inspection Service (FSIS) regulations, the weight of cured pork bellies that are ready for slicing and labeling as "bacon" shall not exceed the weight of the fresh, uncured pork bellies.

There are two primary methods of curing bacon: pumping and dry curing. Although less frequently used, FSIS still receives label applications for immersion-cured bacon.

"Pumped" bacon has curing ingredients that are injected directly into the meat to speed up the curing process and add bulk. This type of mass-produced bacon is held for curing for 6 to 24 hours before being heated. If not properly drained, pumped bacon can exude white liquid during frying.

"Dry-cured" bacon has a premeasured amount of cure mixture applied or rubbed onto the bacon belly surfaces, completely covering them. Additional cure may be rubbed in over a number of days, but the amount of added sodium nitrite cannot exceed 200 parts per million (ppm). After the curing phase, the bacon may be left to hang for up to 2 weeks to draw out moisture. Less time is needed if it is going to be smoked. Because of the lengthy processing time and labor required, dry-cured bacon is more expensive than the more mass-produced, pumped bacon.

"Immersion cured bacon is placed in a brine solution containing salt, nitrite and flavoring material, or in a container with salt, nitrite and flavoring material, for 2 to 3 days. Sugar, honey or maple syrup may be added to the brine. The meat must then be left to hang until it is cured.

Yes, you can make bacon at home. For instructions, contact your local extension office.

To make bacon safe to store at room temperature (shelf stable), it is precooked in the plant to have a water activity at or below 0.85 to control Staphylococcus aureus. The cooked yield is 40% of the raw weight.

"Bacon" can only be made from pork bellies, which are red meat by definition. Pork is classified as "livestock," and all livestock are considered "red meat." Bacon can also be made from other species of livestock (e.g., beef) and poultry (e.g., turkey). These types of bacon products require a descriptive name such as, "beef bacon-cured and smoked beef plate", and "turkey bacon-cured turkey thigh meat"

Salt pork is not bacon. Although it is salted, it is much fattier, and, unlike bacon, it is not smoked. It is generally cut from the hog's belly or side. Because salt pork is so salty, cooks often blanch or soak it to extract some of the salt before using.

Yes, bacon is made with salt as a curing agent. Nitrite, but not nitrate, is the other most frequently used additive. Bacon may also contain other additives such as sugars, maple sugar, wood smoke, flavorings and spices. Pumped bacon (see above) must also contain either ascorbate or sodium erythorbate (isoascorbate), which greatly reduces the formation of nitrosamines by accelerating the reaction of nitrite with the meat.

At certain levels, salt prevents the growth of some types of bacteria that spoil meat. Salt prevents bacterial growth either by directly inhibiting it or by its drying effect. Most bacteria require substantial amounts of moisture to live and grow.

Sodium nitrite produces the pink color (nitrosohemoglobin) in cured bacon. Nitrite also greatly delays the development of the Clostridium botulinum toxin (botulism); develops a cured-meat flavor; retards the development of rancidity, off-odors and off-flavors during storage; and inhibits the development of a warmed-over flavor.

Sugar is added to reduce the harshness of salt. Spices and other flavorings are often added to achieve a characteristic "brand" flavor. Most, but not all, cured meat products are smoked after the curing process to impart a smoked meat flavor.

Under certain conditions not yet fully understood, the products from the natural breakdown of proteins known as "amines" can combine with nitrites to form compounds known as "nitrosamines." There are many different types of nitrosamines, most of which are known carcinogens in test animals.

Not all cured meat products contain nitrosamines; however, when present, they usually are in very minute amounts. Many variables influence nitrosamine levels: amount of nitrite added during processing, concentrations of amines in meat, type and amounts of other ingredients used in processing, actual processing conditions, length of storage, storage temperatures, method of cooking and degree of doneness.

Researchers at the USDA's" with the USDA's Agricultural Research Service found that the addition of vitamin C (also known as ascorbate) and vitamin E (also known as tocopherol) reduced the levels of nitrosamines in fried bacon and in nitrite-cured products. The findings led to changes in federal regulations and industry processing to minimize consumer exposure to nitrosamines. USDA now requires adding 550 ppm of either sodium ascorbate or sodium erythorbate to pumped bacon. This addition greatly reduces the amount of free nitrite and, free nitrite and minimizes the formation of nitrosamines. This regulation is found in Title 9 of the Code of Federal Regulations, 424.22(b)(1).

A bacon cooking study, "Effect of Frying and Other Cooking Conditions on Nitrosopyrrolidine Formation in Bacon" (Journal of Science, Vol. 39, pages 314-316), showed no evidence of nitrosamines in bacon fried at 210 degrees for 10 minutes (raw), 210 degrees for 15 minutes (medium well), 275 degrees for 10 minutes (very light) or 275 degrees for 30 minutes (medium well). But when bacon was fried at 350 degrees for 6 minutes (medium well), 400 degrees for 4 minutes (medium well) or 400 degrees for 10 minutes (burned), some nitrosamines were found. Thus, well-done or burned bacon is potentially more hazardous than less well-done bacon. Also, bacon cooked by a microwave has less nitrosamine than fried bacon.

The USDA is responsible for monitoring the proper use of nitrite by meat processors. While sodium nitrite cannot exceed 200 ppm going into dry-cured bacon, sodium nitrite cannot exceed 120 ppm for both pumped and immersion-cured bacon.

Bacon can be manufactured without the use of nitrite, but must be labeled "Uncured Bacon, No Nitrates or Nitrites added" and bear the statement "Not Preserved, Keep Refrigerated Below 40 degrees At All Times". If the final product has been dried according to USDA regulations, or if the product contains an amount of salt sufficient to achieve an internal brine concentration of 10% or more, the label does not have to carry the handling statement of "Not Preserved, Keep Refrigerated below ___"  Recent research studies have shown for products labeled as uncured, certain ingredients added during formulation can naturally produce small amounts of nitrates in bacon and, therefore, must be labeled with the explanatory statement "no nitrates or nitrites added except for those naturally occurring in ingredients such as celery juice powder, parsley, cherry powder, beet powder, spinach, sea salt etc."

All bacon found in retail stores is either USDA inspected for wholesomeness or inspected by state systems that have standards equal to the federal government. Each animal, from which the bacon is made, is inspected for signs of disease. The "Inspected and Passed by USDA" seal ensures the bacon is wholesome.

Bacon is not graded.

No hormones are used in the raising of hogs. Hormones are not permitted in pork by federal regulations; therefore, bacon cannot have added hormones.

Antibiotics may be given to prevent or treat disease in hogs. A "withdrawal" period is required from the time antibiotics are administered until it is legal to slaughter the animal. This is so residues can exit the animal's system and won't be in the meat.

FSIS randomly samples pork at slaughter and tests for residues. Data from this monitoring program have shown a very low percentage of residue violations.

Pork, like other raw animal muscle foods, frequently contains bacterial pathogens. Some foodborne pathogenic microorganisms that can be found in pork, as well as other meats and poultry, are Salmonella, Staphylococcus aureus, Toxoplasma gondii, Campylobacter, Yersinia enterocolitica and Listeria monocytogenes. They are all destroyed by cooking.

Humans may contract trichinosis, caused by the parasite Trichinella spiralis, by eating undercooked pork. Much progress has been made in reducing trichinosis in grain-fed hogs, and cases in humans have greatly declined since 1950.

Yes, bacon can be labeled as "natural" if the bacon is "uncured." This means the bacon does not contain nitrites or nitrates as direct additive curing agents. Therefore, the bacon would meet the definition for "natural" (minimally processed, no artificial ingredients) and can be labeled as "Natural* Uncured Bacon (No Nitrates or Nitrites Added, Not Preserved, Keep Below 40 degrees At All Times), *Minimally Processed, No Artificial Ingredients."

Yes, if the bacon is made from certified organic meat or poultry, the bacon can be labeled "organic."

Generally, a nutrition facts panel is required on both cooked and raw bacon products.

Yes, FSIS requires safe handling instructions on packages of bacon and all other raw or partially cooked meat and poultry products as part of a comprehensive effort to protect consumers from foodborne illness.

Yes, it is possible for turkey bacon to contain pork, but it must be included on the label name or in the ingredients statemen. All ingredients used in the manufacture of a meat product must be listed in the ingredient statement on the package.

"Bacon bits" are made from 100% real bacon. These products are inspected by USDA. The label and ingredient statement on the jars and resealable pouches will display the product information. For comparison, 1 tablespoon of real bacon bits is equivalent to 1 1/2 strips of bacon.

Imitation products are made from a soy-based product that have a bacon texture and flavor but are kosher and vegetarian. Soy-based products are inspected by the Food and Drug Administration. Companies should not be using the term "bacon" on products not made from pork bellies.

Product dating (i.e., applying "sell-by" or "use-by" dates) is not required by federal regulations. However, many stores and processors may voluntarily choose to date packages of bacon. Use or freeze products with a "sell-by" date within 7 days of purchase. If the manufacturer has determined a "use-by" date, observe it. It's always best to buy a product before its date expires. It's not important if a date expires after freezing bacon because all foods stay safe while frozen.

When buying bacon, look for slices with long veins of lean pink meat and a relatively small amount of fat. If the package bears an expiration date, purchase the package before the date expires.

Washing raw bacon before cooking it is not recommended. Any bacteria that might be present on the surface would be destroyed by cooking.