Logan Steele
Fatty liver disease is a common ailment affecting 20 to 40 percent of the adult population. It is caused by a build-up of fats in the liver, which can lead to serious complications, including cirrhosis and liver failure. While many people with fatty liver disease experience no symptoms, in its advanced stages, it can lead to muscle weakness, also known as myasthenia. This occurs due to a breakdown in communication between nerves and muscles, causing weakness and rapid fatigue in voluntarily controlled muscles. Research in mice has also shown that a fatty liver can lead to the breakdown of muscle proteins, providing further evidence of the link between fatty liver disease and muscle weakness.
| Characteristics | Values |
|---|---|
| Fatty liver disease type | Non-alcoholic fatty liver disease (NAFLD) or Alcohol-related liver disease |
| Muscle weakness | Myasthenia gravis, which refers to weakness and rapid fatigue of any muscles under voluntary control |
| Cause of fatty liver | Build-up of fat over a long period of time, obesity, high-fat diet, high alcohol intake, diabetes mellitus, metabolic syndrome, insulin resistance, malnutrition, rapid weight loss |
| Symptoms | No symptoms in early stages, advanced stages may include fatigue, weight loss, abdominal discomfort, weakness, confusion, yellowing of skin and eyes, itchy skin, swelling in legs, ankles, feet or stomach |
| Treatment | No specific medication, recommended to lose weight, eat a healthy diet, exercise regularly, reduce alcohol consumption, quit smoking, treat associated conditions such as high blood pressure, diabetes and cholesterol |
| Mechanism of muscle weakness | Elevated levels of circulating TNFα, breakdown of muscle proteins due to altered protein secretion profile |
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What You'll Learn
Fatty liver disease is a build-up of fats in the liver
There are two types of fatty liver disease: Alcohol-related liver disease, and Non-alcoholic fatty liver disease (NAFLD). NAFLD is caused by a build-up of fat over a long period and is not caused by excessive alcohol consumption. It is often associated with metabolic syndrome, a cluster of disorders that increase the risk of diabetes, heart disease, and stroke. Risk factors for NAFLD include obesity, a high-fat diet, high blood sugar, high cholesterol, high blood pressure, and diabetes mellitus. Obesity may be the most common cause of the disease, with fatty liver occurring in about 70% of overweight people and 90% of people who are obese.
Fatty liver disease can cause no damage, but sometimes the excess fat leads to inflammation of the liver, a condition called steatohepatitis. Inflammation from a fatty liver is often linked to alcohol abuse, known as alcoholic steatohepatitis. Without alcohol abuse, the condition is called non-alcoholic steatohepatitis, or NASH. An inflamed liver may become scarred and hardened over time, a condition called cirrhosis, which is serious and often leads to liver failure.
One of the key signs of fatty liver disease is muscle weakness, also known as myasthenia. Myasthenia gravis refers to weakness and rapid fatigue of any muscles under voluntary control. It happens due to a breakdown in the normal communication between nerves and muscles. Muscle weakness caused by myasthenia gravis usually worsens as the affected muscle is used, but can improve with rest. However, the symptoms tend to worsen over time. A study in mice has shown that a fatty liver acquires a different protein secretion profile, leading to the breakdown of muscle proteins.
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Muscle weakness is a key sign of fatty liver
Non-alcoholic fatty liver disease (NAFLD) is caused by a build-up of fat in the liver over a long period. This build-up is not caused by excessive alcohol consumption; instead, the condition caused by alcohol is termed Alcohol-related liver disease.
People with NAFLD usually experience no symptoms, but in more advanced stages, it can lead to warning symptoms. One such sign is myasthenia, or muscle weakness. Myasthenia gravis refers to weakness and rapid fatigue of any muscles under your voluntary control. It occurs due to a breakdown in communication between nerves and muscles. While rest can help with muscle weakness, the symptoms worsen over time.
A study in mice has shown that a fatty liver acquires a different protein secretion profile, leading to the breakdown of muscle proteins. This study focused on non-alcoholic fatty liver disease, which affects 20 to 40 percent of the adult population. Being overweight is a major risk factor for the disease, with a fatty liver occurring in about 70 percent of overweight people and 90 percent of people who are obese.
Liver cirrhosis, or scarring of the liver, is a critical health problem associated with complications, including skeletal muscle atrophy. Several studies have indicated that muscle atrophy increases mortality among the elderly. While the mechanism connecting liver disease and sarcopenia is not fully understood, several signalling pathways and molecules have been reported to induce muscle atrophy.
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Non-alcoholic fatty liver disease can worsen with time
Non-alcoholic fatty liver disease (NAFLD) is caused by a build-up of fat in the liver over a long period of time. This build-up is not due to excessive alcohol consumption, which would indicate alcohol-related liver disease.
NAFLD usually presents no symptoms, but in its more advanced stages, it can lead to warning signs such as muscle weakness, also known as myasthenia. Myasthenia gravis refers to the weakness and rapid fatigue of any muscles under voluntary control. It occurs due to a breakdown in communication between nerves and muscles. While rest can help with the weakness, the symptoms of advanced NAFLD generally worsen over time.
NAFLD can progress to metabolic dysfunction-associated steatohepatitis (MASH), which is when the liver has both fat buildup and inflammation. MASH can cause long-term scarring and hardening of the liver, known as cirrhosis. This condition can lead to symptoms such as yellowing of the skin and eyes, itchy skin, and swelling in the legs, ankles, feet, or stomach. While the liver damage from MASH may sometimes stop or reverse itself, it can also continue to deteriorate.
There is currently no specific medication for NAFLD or MASH. However, making healthy lifestyle choices can help manage the condition. This includes losing weight, eating healthily, exercising regularly, avoiding alcohol, quitting smoking, and treating associated conditions such as high blood pressure, diabetes, and high cholesterol.
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Liver cirrhosis is a critical health problem
Liver cirrhosis, or scarring of the liver, is a critical health problem with a range of adverse effects on the body. It is caused by long-term liver diseases that damage liver tissue, including chronic alcoholism and hepatitis. Cirrhosis develops when the liver attempts to repair itself from inflammation and swelling by forming scar tissue. This scar tissue builds up over time, impairing the liver's ability to function properly.
As cirrhosis progresses, the liver becomes increasingly damaged and loses its ability to perform vital functions. One of the key consequences of cirrhosis is the reduction in the liver's capacity to produce bile and essential blood proteins. The scar tissue can also obstruct blood flow and oxygen supply to the liver, further compromising its functionality. This leads to a condition called portal hypertension, which is a significant contributor to hospitalization and death, especially in middle-aged and older adults.
The downstream effects of cirrhosis are extensive and impact multiple organ systems. People with cirrhosis often experience general toxicity, fatigue, reduced immunity, digestive issues, malnutrition, mild cognitive impairment, and motor dysfunction. More severe complications include gastrointestinal bleeding, kidney failure, respiratory failure, chronic liver failure, and liver cancer. The progression of cirrhosis can be slowed through proper management, including maintaining a healthy lifestyle, limiting salt intake, and seeking medical advice for associated conditions.
In addition to the direct effects on the liver, cirrhosis has been linked to skeletal muscle atrophy, particularly in the elderly. Studies have shown that liver fibrosis induced by cirrhosis leads to muscle weakness and atrophy. This muscle atrophy is mediated by elevated levels of circulating TNFα, a signalling molecule that induces muscle breakdown. The combination of liver dysfunction and muscle atrophy adversely affects the clinical outcome of patients with cirrhosis, making it a critical health concern.
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Fatty liver can cause muscle breakdown
Fatty liver, or non-alcoholic fatty liver disease (NAFLD), is a common ailment affecting 20 to 40 percent of adults. It is caused by a build-up of fat in the liver over a long period and is not related to excessive alcohol consumption. While NAFLD was previously thought to be benign, recent studies have shown that it can, in fact, lead to muscle breakdown.
NAFLD is typically asymptomatic, and people often learn about their condition during medical tests for other reasons. However, if the disease progresses to more advanced stages, it can cause a range of symptoms, including muscle weakness, also known as myasthenia. Myasthenia gravis is characterised by weakness and rapid fatigue of voluntarily controlled muscles, resulting from disrupted communication between nerves and muscles.
The mechanism underlying NAFLD-induced muscle atrophy is not yet fully understood. However, studies in mice have provided valuable insights. Researchers have found that a fatty liver alters the protein secretion profile, leading to the breakdown of muscle proteins. These proteins, circulating through the bloodstream, contribute to the development of insulin resistance, a hallmark of type 2 diabetes. Furthermore, elevated levels of circulating TNFα, a signalling molecule, have been implicated in liver fibrosis-induced muscle atrophy.
The link between fatty liver and muscle atrophy in humans is an active area of research. While the precise mechanism remains unclear, maintaining a healthy lifestyle, including weight management, exercise, and a nutritious diet, is recommended to prevent muscle loss and improve liver and muscle health.
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Frequently asked questions
Fatty liver disease is a build-up of fats in the liver that can damage the organ and lead to serious complications. It is caused by obesity, a high-fat diet, high alcohol intake, and diabetes mellitus.
Fatty liver disease often produces no symptoms on its own, so people usually learn about it when they have medical tests for other reasons. However, if the disease gets worse, you may experience fatigue, weight loss, abdominal discomfort, weakness, and confusion.
Yes, muscle weakness is a key sign of fatty liver disease. A study in mice has shown that a fatty liver acquires a different protein secretion profile, leading to the breakdown of muscle proteins.
