Athena Vale
Meat is muscle, but it is not just muscle. The meat we eat is largely made up of muscle fibres, connective and fat tissues, and intramuscular fat. The muscle mass of livestock and fish species used for human food represents 35 to 60% of their body weight. In addition to muscle, humans also eat organs, bones, and skin. The consumption of meat has changed over time, with modern society favouring lean, muscular portions of meat and poultry, while ancestral cultures traditionally preferred fatty regions, organ meats, and bones. Nutritional research suggests that consuming the whole animal, including muscle meats, organ meats, and bone broth, provides optimal nutrition.
| Characteristics | Values |
|---|---|
| Nutritional composition | High in protein, zinc, vitamin B12, iron, and choline |
| High in tryptophan and methionine, low in glycine | |
| Health effects | Excessive consumption can lead to inflammation, altered genetic expression, and poor detoxification |
| Can interfere with B6 absorption and deplete reserves of riboflavin (B2), folate, zinc, and B12 | |
| Can lead to elevated homocysteine levels, a risk factor for cardiovascular disease, stroke, and diabetes | |
| Ancestral diet | Ancestral cultures favored fatty regions, organ meats, bones, and bone marrow |
| Bones and cartilaginous components provided collagen proteins beneficial for skin, bones, hair, nails, and gut lining | |
| Modern society | Modern society emphasizes lean, muscular portions of meat, often discarding connective tissue |
| Meat quality | Influenced by bacterial load, presence of chemical residues, and environmental pollutants |
| Critical qualities for consumers include tenderness, color, and healthiness |
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What You'll Learn
Meat is muscle with fat marbled through it
Meat is a great source of protein and provides a full array of amino acids. It is mostly made up of muscle but also contains fat, veins, arteries, and sometimes skin. The fat is deposited all over certain parts of the animal and contributes to the meat's flavour, colour, and shelf life.
Intramuscular fat, also known as marbling, is found within the muscles. When looking at a piece of meat, this fat appears as thin, creamy white streaks or a pattern of wavy lines that contrast against the colour of the flesh. Marbling is particularly prevalent in beef, where it is highly sought after by meat connoisseurs. The more marbling, the better the taste, as it gives the meat a sweet, buttery flavour and a juicy, tender texture.
The amount of marbling depends on several factors, including the breed and age of the animal, its diet, and the part of the animal the meat is cut from. For example, marbling is more common in slow-growing breeds such as Highland, Galloway, or shorthorn cattle. It is also influenced by the animal's diet and how long they spend grazing. If cattle do not put on enough weight, the marbling leaves their muscles, resulting in lean, dry, and bland meat.
While modern society has emphasised the use of lean, muscular portions of meat, our ancestral cultures traditionally favoured fatty regions, organ meats, and bones as invaluable sources of nutrition. Nutritional research now suggests that consuming the whole animal, including muscle meats, organ meats, and bone broth, provides the nutritional synergy needed for optimal health.
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Organ meats are important for nutrition
Organ meats, also known as "offal", are the consumable organs of animals. While organ meats are incredibly nutritious, they are not commonly consumed in most Western cuisines. In many cases, people consider offal as food for animals rather than a nutritious addition to their own diets. However, organ meats are loaded with important vitamins and minerals, often in much higher concentrations than many other foods.
Organ meats are a great source of protein, an essential nutrient that plays a central role in tissue growth and repair. Getting enough protein in your diet is especially important when it comes to building and preserving muscle mass. For instance, one study published in the Journal of Nutrition, Health & Aging showed that higher protein intake, from animal sources in particular, was linked to increased preservation of muscle. Organ meats are also a rich source of many vitamins and minerals that can be hard to obtain from other foods. They are particularly rich in B-vitamins, such as vitamin B12 and folate. They are also rich in minerals, including iron, magnesium, selenium and zinc, and important fat-soluble vitamins like vitamins A, D, E and K.
Thiamin, also known as Vitamin B1, is present in liver. Studies have shown that thiamin can help prevent risk factors for Alzheimer’s disease, including memory loss and plaque formation. Many organ meats are also high in zinc, including the liver, kidneys, and heart. Zinc is essential for your immune system to work properly. People with a zinc deficiency are more susceptible to infection.
In traditional Chinese medicine, consuming organ meats from animals was believed to support the same organs in the human body. For example, eating kidney parts can provide over five times the amount of B12 you need each day, as well as almost two times your value for riboflavin. However, while organ meats are highly nutritious, they also contain a lot of cholesterol (especially the liver and heart). As such, it is recommended that organ meats be eaten in moderation.
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Lean muscle meats are rich in protein, zinc, vitamin B12, iron and choline
Lean muscle meats are indeed rich in protein, zinc, vitamin B12, iron, and choline. They are also a source of vitamin A, niacin, and vitamin B6.
Protein is a vital compound in physiology and is essential to life. It is a priority for building lean muscle, and animal-based sources of protein, such as meat, fish, and milk products, are beneficial for lean muscle mass. Meat is a complete protein, meaning it contains all the essential amino acids. These amino acids are important for muscle health, and a deficiency can lead to age-related muscle wasting and an increased risk of sarcopenia, a serious health issue among older adults.
Zinc is another essential mineral found in high quantities in lean meats. It is important for body growth and maintenance and is involved in immune system function. A diet rich in zinc can help prevent atherosclerosis and prostate cancer.
Vitamin B12 is an essential nutrient, especially for blood formation, and the health of the brain and nervous system. It is mainly found in animal-derived foods, such as meat, and is important for gaining and maintaining lean muscle mass.
Iron is also found in high amounts in lean meats, especially beef. It is required for the formation of hemoglobin, and a deficiency can lead to anemia and decreased intellectual and work performance. Iron plays a crucial role in the function of organs, bones, and muscle building, as it is used to store and transport oxygen in the blood and muscles.
Choline, while present in smaller quantities, is another important nutrient found in lean meats.
While these nutrients are essential for health and muscle development, it is important to note that an imbalance of lean muscle meats over fatty, gelatinous regions, such as organ meats and bones, may contribute to common health problems. This is because a diet high in muscle meats but low in bone broth and organ meats can cause an improper methionine-to-glycine ratio, leading to increased inflammation and altered genetic expression. Therefore, consuming the whole animal, including muscle, organ meats, and bone broth, is recommended for optimal health.
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Amino acid imbalances can cause inflammation and altered gene expression
Amino acids are organic compounds that play a crucial role in various biological processes, including protein synthesis, cellular metabolism, and immune function. An adequate supply of amino acids is essential for maintaining overall health and homeostasis in the body. However, imbalances in amino acid levels can have detrimental effects, leading to inflammation and altered gene expression, particularly in muscle tissue.
Meat, especially red meat, is a significant source of amino acids in the human diet. It contains all the essential amino acids that the body cannot produce on its own and must be obtained from food. While meat can provide valuable amino acids, the way it is produced and processed can impact its amino acid composition and overall quality. For instance, genetic selection and nutritional strategies in modern livestock farming have led to faster growth rates and higher meat yields. However, this has also resulted in meat quality issues, such as muscle myopathies and altered fat deposition, which can affect the amino acid profile of the meat.
Additionally, amino acid imbalances can affect gene expression by influencing the activity of specific transcription factors and signalling pathways. For example, in conditions of limited amino acid availability, the transcription factor ATF4 is upregulated. ATF4 regulates the expression of a large number of genes, including those involved in cellular responses to amino acid deprivation. Furthermore, amino acid imbalances can impact the development and quality of intramuscular fat (IMF), which is highly valued for its contribution to meat flavour and juiciness. IMF development has been linked to connective tissue remodelling and pro-inflammatory states, which can further influence gene expression patterns in muscle tissue.
In conclusion, amino acid imbalances can indeed cause inflammation and altered gene expression, particularly in the context of muscle meat. While meat is a valuable source of amino acids, it is important to consider the potential impact of production methods and dietary interventions on amino acid levels, as these can have downstream effects on inflammation, gene expression, and overall meat quality.
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Meat quality is influenced by muscle structure and composition
Meat quality is influenced by several factors, including the structure and composition of the muscle. Skeletal muscle is made up of various tissues, including muscle fibres, connective tissues, and adipose tissues. The contractile and metabolic types, size, and number of muscle fibres, as well as the content, composition, and distribution of connective tissues, all play a role in determining the meat's appearance, colour, tenderness, juiciness, flavour, and technological value.
The water-holding capacity of meat is one of the critical factors influencing its quality. This capacity is influenced by the rate and extent of the decrease in postmortem pH. A high rate of pH decrease, combined with a high muscle temperature, can lead to denaturation of muscle proteins, reduced water-holding capacity, and increased cooking loss of meat, particularly in pigs and poultry.
The biochemical and structural characteristics of muscle fibres, intramuscular connective tissue, and intramuscular fat can be independently modulated to achieve production efficiency and improve meat quality. Nutritional factors, such as dietary supplementation, can also influence meat quality. For example, studies have shown that garlic powder supplementation can impact the growth performance and carcass traits of Japanese quails, potentially affecting meat quality.
Tenderness is another critical factor influencing meat quality. In pigs, a negative relationship has been demonstrated between average fast glycolytic fibre CSA and tenderness. However, in chickens, an increase in fibre CSA in the Pectoralis muscle is associated with improved tenderness. In fish, a negative correlation has been observed between the mean diameter of muscle fibres and flesh firmness.
Overall, the structure and composition of muscle have a direct impact on meat quality traits, influencing the technological, nutritional, and sensory properties of meat from different livestock and fish species.
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Frequently asked questions
Muscle meat is the muscle of an animal with fat marbled through it. The meat we eat is mostly muscle but also includes other parts like veins, arteries, skin, and connective tissue.
Muscle meat is rich in protein, zinc, vitamin B12, iron, and choline. It is also a complete protein source, meaning it contains a full array of amino acids.
Consuming a diet high in muscle meat but low in bone broth and organ meats can lead to an improper methionine-to-glycine ratio, depleting the body of B vitamins and trace minerals. Excessive methionine can lead to elevated levels of homocysteine, an inflammatory protein associated with cardiovascular disease, stroke, and diabetes.
