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Meat is defined by the Codex Alimentarius as all parts of an animal that are intended for, or have been judged as safe and suitable for human consumption. The edible parts of animal flesh are primarily its muscle tissue, which is made up of muscle cells, connective tissue, and fat. Muscle meat is essential for a complete and balanced diet and is the main source of protein in raw diets. It is also a source of other essential nutrients such as water-soluble vitamins and minerals. The biochemical and structural characteristics of muscle fibers, connective tissue, and fat play a role in determining meat's appearance, color, tenderness, juiciness, flavor, and technological value.
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What You'll Learn
Meat is defined as animal parts safe for human consumption
Meat is defined as animal parts that are safe for human consumption. It is animal tissue, often muscle, that is eaten as food. The most commonly consumed meat is beef, which comes from cattle. Other common sources of meat include pigs, sheep, lambs, and goats. Meat can also come from chickens, horses, and other animals.
Meat is composed primarily of skeletal muscle, along with associated fat, tendons, ligaments, and connective tissue. It may also include organs, such as the liver, heart, kidneys, and intestines, known as offal. While meat is typically thought of as muscle tissue, it can also include skin, bone marrow, and other animal parts.
The word "meat" comes from the Old English word "mete," which meant food in general. Today, the term is often used more restrictively to refer specifically to the flesh of mammals raised for human consumption, excluding fish, seafood, insects, poultry, or other animals. Meat is valued as a complete protein food, containing all the essential amino acids needed by the human body. It is also a good source of energy and essential vitamins and minerals.
Meat has been a significant part of the human diet since prehistoric times, with evidence suggesting that it constituted a substantial proportion of the diet of early humans. The Neolithic Revolution, which began around 11,000 years ago, allowed the domestication of animals for meat production, leading to selective breeding for desired traits. Today, meat production is a major industry, contributing to economies and cultures worldwide. However, it is also a contributor to environmental issues such as global warming, pollution, and biodiversity loss.
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Muscle tissue makes up most of the meat we eat
Muscle tissue does indeed make up most of the meat we eat. Meat is defined by the Codex Alimentarius as "all parts of an animal that are intended for, or have been judged as safe and suitable for human consumption". This includes muscle cells, connective tissue, and fat. The edible parts of animal flesh are primarily its muscle tissue.
The muscle mass of livestock and fish species used for human food can represent 35 to 60% of the animal's total body weight. Meat muscle is made of fibres that are bundled together with connective tissue. The biochemical and structural characteristics of muscle fibres, intramuscular connective tissue, and intramuscular fat all play independent roles in the meat's sensory qualities. For example, thin, short muscle fibres result in more tender meat, while thick, long fibres result in firmer meat.
The muscle tissue we eat as meat is made up of water, amino acids, carbohydrates, minerals, vitamins, and flesh. The muscle fibres, or myofibrils, contain filaments arranged in a repetitive pattern alongside other myofibrils. The contractile and metabolic types, size, and number of muscle fibres, as well as the content, composition, and distribution of the connective tissue, all play a role in determining the meat's appearance, colour, tenderness, juiciness, flavour, and technological value.
The meat we consume is mostly made up of animal muscles that have gone through a conversion process that begins once the animal is killed. This process causes the muscle to remain in a constant rigid position, known as rigor mortis.
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Meat is made up of muscle cells, connective tissue, and fat
Meat is primarily made up of muscle cells, connective tissue, and fat. According to the Codex Alimentarius, meat is defined as "all parts of an animal that are intended for, or have been judged as safe and suitable for human consumption". The edible parts are mainly its muscle tissue, which is composed of muscle fibres or cells, connective tissue, and fat.
Muscle fibres are bundled together with connective tissue, and they contain filaments arranged in a repetitive pattern. The connective tissue in muscles is composed mainly of the protein collagen, which acts as an extracellular support for the fibres. The bundles of muscle fibres are enclosed in a sheath of connective tissue known as the perimysium, while the entire muscle is surrounded by a denser connective tissue sheath called the epimysium.
Fat is a major component of meat and is found throughout the carcass or cuts of meat. It contributes to the meat's flavour, juiciness, tenderness, and caloric content. The amount of fat can vary extensively in the animal and in different cuts of meat. The biochemical and structural characteristics of muscle fibres, intramuscular connective tissue, and intramuscular fat play independent roles, and these properties can be modulated to achieve production efficiency and improve meat quality.
In addition to muscle fibres, connective, adipose, vascular, and nervous tissues are also present in meat. The meat we consume has typically 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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Meat's flavour, juiciness, and tenderness are influenced by lipids
Meat is primarily composed of muscle tissue, with fat, skin, and other components making up a small fraction of what we eat. The flavour, juiciness, and tenderness of meat are influenced by various factors, including lipids.
Lipids, or fats, play a crucial role in the sensory attributes of meat, particularly in terms of flavour, juiciness, and tenderness. Firstly, lipids affect the flavour of meat. Raw meat has a relatively mild flavour, but cooking enhances its flavour through the Maillard reaction, which involves the interaction of lipids with other compounds. The specific type of fat, such as fatty acids, can also influence the flavour intensity and overall sensory experience of the meat.
The juiciness of meat is also influenced by lipids. Fat can enhance the water-holding capacity of meat, lubricate muscle fibres during cooking, and increase tenderness, contributing to the perception of juiciness. The relationship between fat content and juiciness varies across different types of meat, such as lamb, pork, and beef.
Additionally, lipids impact the tenderness of meat. As the intramuscular fat content increases, the shear force value decreases, suggesting a potential relationship between fat content and tenderness. However, the exact mechanism by which lipids influence tenderness is not fully understood.
It is worth noting that the weight and age of the animal can also affect the sensory attributes of meat. Older animals tend to have meat that is darker, more flavourful, and firmer, while younger animals have meat that is lighter in colour, more tender, and milder in flavour.
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Meat alternatives are usually made from plant-based ingredients
Meat is considered to be primarily muscle tissue, often with skin, fat, veins, arteries, and sometimes bones. However, with the rise of vegetarianism and veganism, many people are turning to meat alternatives, which are usually made from plant-based ingredients.
Meat alternatives, also known as mock meat or alternative proteins, are food products made from vegetarian or vegan ingredients, designed to replace meat. They are typically made from plant- or fungus-based substitutes, with soy being a common choice. Tofu, tempeh, and textured vegetable protein are examples of soy-based meat alternatives. Tofu, invented in China as early as 200 BCE, was even known as "small mutton", showing its value as an imitation meat. Other alternatives are made from wheat gluten, like seitan, or pea protein, like the Beyond Burger.
Meat alternatives aim to approximate the qualities of specific types of meat, such as mouthfeel, flavour, appearance, and chemical characteristics. They often contain 50-80% water, 10-25% textured vegetable proteins, 4-20% non-textured proteins, 0-15% fat and oil, 3-10% flavours/spices, and 1-5% binding agents. These binding agents, such as methylcellulose, starch, and gums, give the product a meaty texture. Manufacturers may also add nutrients like vitamin B12 to make the product more nutritionally similar to meat.
Meat alternatives are popular among vegetarians, vegans, and those following religious or cultural dietary laws. They are also gaining traction among non-vegetarians and flexitarians who wish to reduce their environmental impact and contribute to sustainable diets. However, some consumers are put off by the long list of ingredients in meat alternatives, which can be seen as artificial or unnatural.
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Frequently asked questions
Meat is defined by the Codex Alimentarius as “all parts of an animal that are intended for, or have been judged as safe and suitable for human consumption.” Meat is comprised of three major components: muscle cells, connective tissue, and fat.
Muscle meat is the primary component of a raw diet and is essential for a complete and balanced diet. The term “muscle meat” includes ingredients other than boneless muscle meat. Muscle meat is further segmented into white and red meat.
Animal tongues, heart, lungs, and gizzards are all examples of muscle meat.
