Dominic Stone
Meat is defined as all parts of an animal that are intended for, or have been judged as safe and suitable for human consumption. It is composed of three major components: muscle cells, connective tissue, and fat. The edible parts of animal flesh are mainly its muscle tissue, which is made up of fibres bundled together with connective tissue. The meat we consume is mostly made up of animal muscles that have gone through a conversion process that begins once an animal is slaughtered, causing its muscle to remain in a constant rigid position named rigor mortis.
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What You'll Learn
Meat is muscle tissue
The edible parts of animal flesh are mainly its muscle tissue. The quality and eating characteristics of a cut of meat are based on the quantity, type, and distribution of connective tissue in a muscle. Grilling cuts contain less connective tissue, while braising cuts contain more. The closer to the ground or head a muscle is located, the more connective tissue will be present.
Fat is a unique form of connective tissue that insulates the body and protects internal organs. It also stores energy in the form of intramuscular fats within the muscle bundles. The type of food consumed by an animal will affect the flavour of its muscle tissue. For example, pasture-fed beef has an earthy taste because the animal has eaten grass. The age of the animal is also a determining factor in the composition of meat. Older animals have less water and more fat, while younger animals have more water and less fat.
Meat muscle fibres can be thin and short, resulting in more tender meat, or thick and long, resulting in firmer meat. Examples of tender cuts include ribeye steaks, pork chops, and lamb loin, while beef flanks, pork belly, and lamb breast are tougher cuts with long, thick muscle fibres.
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Meat contains fat, vitamins and minerals
Meat is the muscle of an animal that has been processed for human consumption. It contains protein, vitamins, and minerals, as well as fat and connective tissue. The quality and characteristics of a cut of meat are based on the quantity, type, and distribution of connective tissue in the muscle. The closer the muscle is to the ground or the head, the more connective tissue it will have.
Meat is a good source of protein, vitamins, and minerals in your diet. Meat such as chicken, pork, lamb, and beef are all rich in protein. Red meat provides us with iron, zinc, and B vitamins. Meat is one of the main sources of vitamin B12 in the diet. It is also a source of vitamin A, which is essential for maintaining vision, physical development, immune function, and reproduction.
Meat contains fat, which serves several purposes in the animal's body. It primarily insulates the body, protecting the internal organs, and stores energy. There are two types of fat: saturated fats that surround the internal organs, and unsaturated fats such as intramuscular fats, also known as marbling. The type and quality of food consumed by the animal will affect the flavour of the muscle.
While meat is a good source of nutrients, it is recommended that people consume it in moderation as part of a healthy, balanced diet. Eating too much red meat, processed meat, or meat high in saturated fats can lead to health problems such as high cholesterol and an increased risk of coronary heart disease and bowel cancer.
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Meat colour is important
The colour of meat is determined by how the muscle is used, as well as the age of the animal. The older the animal, the more myoglobin content in the muscle, resulting in a darker red colour. The myoglobin content is also higher in muscles used for movement than in those used for support. Myoglobin is a heme iron-containing protein that gives meat its colour and is a great source of dietary iron. It stores oxygen in muscle cells, and its exposure to oxygen, as well as the chemical state of the iron, determines the colour of the meat.
When meat is cut, oxygen reacts with the myoglobin, creating the bright red colour associated with oxymyoglobin. This will continue until the iron in the myoglobin oxidizes to the point of the metmyoglobin stage, resulting in a brown colour. The meat colour goes through three stages and three colours: purplish-red (myoglobin), cherry red (oxymyoglobin), and brown (metmyoglobin). It is important to note that a change in colour does not always indicate spoilage, and properly stored and prepared meat with discolouration can still be safe to consume.
The colour of meat can also vary depending on the species of animal. For example, poultry has white meat in some parts and dark meat in others, while duck and game birds have mostly dark meat. The colour of meat is important for meat cutters and cooks, who may need to explain these differences to customers.
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Meat conversion process
Meat is the muscle of an animal that has been processed for human consumption. The process of converting muscle into meat is largely orchestrated by energy production, as well as mitochondrial metabolism and homeostasis through calcium and permeability transition regulation. The transformation from living animal muscle to meat is governed by a complex interplay of hydrolytic-driven post-mortem biochemical and physical processes, resulting in dynamic textural and compositional changes.
Post-mortem reactions also initiate stiffening (i.e., rigor mortis) and subsequent post-rigor tenderization, which is key to the textural development of the meat. The muscle undergoes proteolytic disruption of myofibrillar proteins, improving meat tenderness and flavour. Factors such as genetics, nutrition, environmental conditions, and pre- and post-mortem handling can drastically influence the conversion of muscle to meat and the ultimate end-product quality.
The quality and eating characteristics of a cut of meat are generally based on the quantity, type, and distribution of connective tissue in a muscle. Grilling cuts contain less connective tissue, while braising cuts contain more. The closer to the ground the muscle is located, the more work it will do and the more connective tissue will be present. The same rule applies to muscles closer to the head.
Fat is a unique form of connective tissue that serves three main purposes in the living animal. Primarily, fat insulates the body, protecting the internal organs, and stores energy. Fats fall into two classes: saturated fats that surround the internal organs like the kidneys, and unsaturated fats such as intramuscular fats, also known as marbling. As animals eat, their food is converted into energy, which is used immediately but also stored for later use in the form of fat within the muscle bundles.
Lab-grown meat, or cultured meat, is produced from the stem cells of living organisms in a controlled environment. This production method eliminates the need to raise and farm animals for food, and during the process, stem cells are cultured in a nutrient "broth". The feed conversion ratio (FCR) is the amount of feed required to make lab-grown meat, and the less broth necessary, the cheaper and more climate-friendly the lab-grown meat is.
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Meat quality and eating characteristics
Meat is the muscle of an animal that has been processed for human consumption. The quality and eating characteristics of a cut of meat are based on the quantity, type, and distribution of connective tissue in a muscle. The eating quality of an animal is influenced by multiple on-farm factors, such as diet and rearing conditions, as well as genetics, animal health, and handling. The quality of meat is also determined by the animal's age, with older animals having less water and more fat, and younger animals having more water and less fat.
The traditional quality factor, expressed as freshness or wholesomeness, relates to the perception that the meat is safe to eat and free from pathogens, parasites, infection agents, or toxins. The marketability and consistency of meat quality are challenging because these attributes are altered from post-slaughter conditions to the production chain, the beef-processing plant, and even in the purchaser's home.
The flavour of meat is influenced by the quality, quantity, and type of food consumed by the animal. For example, pasture-fed beef has an earthy taste due to the grass in its diet. The basic flavour and aroma of meat arise from a browning-type reaction between reducing sugars and amino acids and the presence of volatile compounds.
The texture of meat is influenced by the amount of connective tissue in the muscle, with grilling cuts containing less connective tissue and braising cuts containing more. The amount of connective tissue also depends on the muscle's location on the animal, with muscles closer to the ground or head doing more work and having more connective tissue.
The fat content of meat also affects its eating characteristics. Fat insulates the body, protects the internal organs, and stores energy. Saturated fats surround internal organs like the kidneys, while unsaturated fats, such as intramuscular fats or marbling, are found within the muscle bundles. Fat deposition is believed to enhance the eating quality of meat, contributing to flavour and juiciness.
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Frequently asked questions
Yes, meat is defined as "all parts of an animal that are intended for, or have been judged as safe and suitable for human consumption," and is comprised of three major components: muscle cells, connective tissue, and fat.
Meat is composed of long, thin cells called filaments. These filaments are bundled together with connective tissue to form muscle fibres. The structure and composition of meat can vary depending on the species, cut, and processing methods.
As animals eat, their food is converted into energy and stored as fats within the muscle. The quality, quantity, and type of food consumed will affect the flavour of the muscle. For example, pasture-fed beef tends to taste earthy because the animals eat grass.
The colour of meat is due to the presence of myoglobin, which gives meat an attractive bright red colour when exposed to oxygen. During storage, myoglobin can be oxidized into metmyoglobin, which produces an unattractive brown colour.
Meat is rich in protein, minerals, and vitamins. It contains no carbohydrates, as any carbohydrates present in the live animal would have been converted into lactic acid at the time of slaughter.
