Maximus Gage
In extreme conditions, such as starvation, the body can enter a state of catabolysis, where it begins to break down fat and muscle tissue to stay alive. This process can be life-threatening, causing permanent damage to muscles and organs if left untreated for several months. This phenomenon, known as muscle atrophy or rhabdomyolysis, involves the breakdown of skeletal muscle proteins to release amino acids, leading to muscle weakness and potential kidney damage. While early medical intervention can reverse the effects of catabolysis, it may take weeks to months for muscle mass and fat deposits to recover, if at all.
| Characteristics | Values |
|---|---|
| Term | Catabolysis, Muscle Atrophy, Rhabdomyolysis |
| Process | The body breaks down fat and muscle tissue to stay alive |
| Cause | Lack of nourishment (protein, carbohydrates, vitamins) |
| Timeframe | 1-2 months without nutrition |
| Symptoms | Muscle weakness, fatigue, pain, kidney damage |
| Treatment | Medical intervention, intravenous nutrition, blood transfusion, oxygen replenishment |
| Prevention | Drinking plenty of fluids, avoiding certain drugs/medicines |
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What You'll Learn
Muscle atrophy
There are three types of muscle atrophy: physiologic, pathologic, and neurogenic. Physiologic atrophy, also known as disuse atrophy, is caused by not using the muscles enough. This can be due to a sedentary lifestyle, malnourishment, a lack of exercise, or being bedridden due to an injury or illness. Physiologic atrophy can often be reversed with exercise and better nutrition.
Pathologic atrophy is seen with aging, starvation, and diseases such as Cushing's disease or hypothyroidism. Malnutrition first causes fat loss but may progress to muscle atrophy in prolonged starvation and can be reversed with nutritional therapy. Cachexia is a wasting syndrome caused by underlying diseases such as cancer, which causes dramatic muscle atrophy and cannot be completely reversed with nutritional therapy.
Neurogenic atrophy is the most severe type of muscle atrophy. It is caused by an injury to, or disease of, a nerve that connects to the muscle. This type of atrophy can occur more suddenly than physiologic atrophy. Examples of neurogenic atrophy include amyotrophic lateral sclerosis (ALS), Charcot-Marie-Tooth disease, and damage to the spinal cord or brain, such as in a stroke.
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Catabolysis
During catabolysis, the body utilises its natural store of fat, or adipose tissue, which contains reserve energy. This process results in weight loss and a decrease in fat deposits. However, as fat reserves diminish, the body begins to metabolise muscle tissue, leading to muscle atrophy, or muscle wasting. This atrophy is a result of the breakdown of skeletal muscle proteins to release amino acids, which are then converted into alpha-keto acids in the liver and ultimately into glucose to maintain proper blood sugar levels.
Muscle weakness or fatigue may be experienced during catabolysis, but it is not a definitive symptom. The true danger lies in the degradation of the body's protein synthesis machinery, which can reach a point of no return. At this stage, providing food or protein is ineffective, as the body can no longer handle protein intake.
While the term "muscle eats itself" is not a medically recognised term, the process of catabolysis, or muscle atrophy, describes a similar concept where the body breaks down its own muscle tissue as a last resort to sustain vital functions during prolonged periods of starvation or malnutrition.
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Rhabdomyolysis
Symptoms of rhabdomyolysis include muscle pain, weakness, vomiting, confusion, and tea-coloured urine. Diagnosis is based on abnormal blood tests, with the most reliable test being the level of creatine kinase (CK) in the blood. CK is released by damaged muscles, and levels above 1000 U/L indicate rhabdomyolysis.
Treatment for rhabdomyolysis focuses on managing the airway, breathing, and circulation, as well as preserving renal function through vigorous rehydration. Intravenous fluids containing bicarbonate can help prevent kidney damage, and in some cases, kidney dialysis may be necessary.
The outcome for those with rhabdomyolysis depends on the amount of kidney damage. Acute kidney failure occurs in many cases, and early treatment can reduce the risk of permanent kidney damage. People with milder cases may recover within a few weeks to a month, but some may continue to experience fatigue and muscle pain.
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Malnutrition
Undernutrition can manifest as stunting, wasting, and being underweight. It can have severe consequences, especially if it occurs during pregnancy or before the age of two. Extreme undernutrition can lead to starvation, chronic hunger, and severe or moderate acute malnutrition. Micronutrient undernutrition, resulting from insufficient intake of vitamins and minerals, is also common worldwide, with deficiencies in iodine, Vitamin A, and iron being the most prevalent. Certain groups, such as elderly people, women (especially during pregnancy or breastfeeding), and children in low-income countries, are at higher risk of undernutrition.
On the other hand, overnutrition is becoming an increasingly global issue. It occurs in people who consume excessive amounts of food, eat an unhealthy diet, lack physical activity, or take excessive amounts of vitamins or dietary supplements. Obesity and diet-related non-communicable diseases, such as heart disease, stroke, diabetes, and certain cancers, are significant concerns associated with overnutrition.
In severe cases of malnutrition, the body may enter a state of catabolysis, where it breaks down fat and muscle tissue to stay alive. This process can lead to muscle atrophy, where the body cannibalizes its skeletal muscle proteins to liberate amino acids. If left untreated for an extended period, catabolysis can cause permanent damage to muscles and organs and even lead to death.
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Muscle wasting
There are three types of muscle atrophy: physiologic, pathologic, and neurogenic. Physiologic atrophy is caused by not using the muscles enough. This type of atrophy can often be reversed with exercise and better nutrition. People who are most affected are those with seated jobs, health problems that limit movement, or decreased activity levels. Pathologic atrophy is seen with ageing, starvation, and diseases such as Cushing's disease. Neurogenic atrophy is the most severe type of muscle atrophy. It can be caused by an injury to, or disease of, a nerve that connects to the muscle. This type of muscle atrophy tends to occur more suddenly than physiologic atrophy. Examples of diseases affecting the nerves that control muscles include amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease, and carpal tunnel syndrome.
Muscle atrophy results from an imbalance between protein synthesis and protein degradation. During atrophy, the structure of the muscle cell is disassembled. MuRF1, an atrophy-related gene, is a ubiquitin ligase that "ubiquitylates", or tags a protein, by attaching a ubiquitin molecule, marking it for degradation by the cell. It was unclear when and how ubiquitylation was involved in disassembling skeletal muscles. However, researchers have found that enzyme MuRF1 selectively degrades the thick filaments in muscle, while bypassing the thin filaments.
Certain diseases can cause a complex muscle wasting syndrome known as cachexia. Cachexia is commonly seen in cancer, congestive heart failure, chronic obstructive pulmonary disease, chronic kidney disease and AIDS. It causes ongoing muscle loss that is not entirely reversed with nutritional therapy. In contrast, malnutrition first causes fat loss but may progress to muscle atrophy in prolonged starvation and can be reversed with nutritional therapy.
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Frequently asked questions
Muscle atrophy is when the body cannibalizes itself, breaking down skeletal muscle proteins to release amino acids.
Muscle atrophy is caused by fasting or muscle wasting that is common in cancer or AIDS patients.
Catabolysis is a biological process in which the body breaks down fat and muscle tissue in order to stay alive. Catabolysis occurs when there is no source of protein, carbohydrate, or vitamin nourishment feeding all body systems.
Muscle atrophy can lead to permanent damage to muscles and organs and can eventually cause death if left untreated.
