#Insulin resistance and dyslipidemia
next locustBOT
<@1082069574901563453> why does the liver convert free fatty acids to triglyceri...
The liver converts free fatty acids (FFAs) into triglycerides as part of its routine metabolic processes, and for several reasons:
- Energy storage: Triglycerides serve as a major form of energy storage in the body. By converting FFAs to triglycerides, the liver effectively stores energy that can be released when it is needed.
- Detoxification and protection: FFAs can be potentially toxic to cells if they accumulate in large amounts, leading to a condition called lipotoxicity. By converting them into triglycerides, the liver helps to prevent this toxicity.
- Transport & Delivery: Triglycerides can't circulate freely in the blood because they are not soluble in water. So, they are packed inside lipoproteins, such as Very-Low-Density Lipoproteins (VLDL), to make them transportable in the bloodstream. Once in the bloodstream, these lipoproteins deliver triglycerides to various tissues in the body where they can be used as an energy source or stored for later use.
However, in the condition of insulin resistance, the usual balance of these processes can be disrupted. Because there's too much FFA for the liver to handle due to insulin's failure to suppress fat mobilization from adipose tissue, the liver overproduces triglycerides. This excessive production exceeds the body's storage and use capacities, leading to higher levels of triglycerides in the blood, or hypertriglyceridemia, a characteristic of dyslipidemia.
wheat echo
@next locust does the liver store triglycerides?
next locustBOT
<@1082069574901563453> does the liver store triglycerides?
Yes, the liver does store triglycerides, but its primary function is not storage. The liver acts as a central hub in lipid metabolism. It helps in the production, distribution, and breakdown of fat and cholesterol, and convert excess carbohydrates and proteins into fatty acids and triglyceride, which are subsequently exported and stored in fat cells (adipose tissue).
However, when the liver starts to store excessive amounts of triglycerides, it can become a problem and may lead to conditions like non-alcoholic fatty liver disease (NAFLD). NAFLD occurs when the balance of triglyceride production, export, and breakdown is disrupted, leading to accumulation of triglyceride within the liver cells. This can cause inflammation and may progress to more serious liver disease.
So, while the liver does have the capacity to store triglycerides, it is not its primary role and excessive storage can be harmful to liver health. The majority of triglycerides are stored in adipose (fat) tissue.
wheat echo
@next locust you said early that the liver coverts free fatty acids to triglycerides. Do these triglycerides get stored in the liver or released into the blood?
next locustBOT
<@1082069574901563453> you said early that the liver coverts free fatty acids to...
Triglycerides synthesized in the liver are primarily packaged into very low-density lipoproteins (VLDLs) and then released into the bloodstream. From there, these VLDLs distribute triglycerides to tissues throughout the body. So, while the liver can and does store some triglycerides, its primary role after synthesizing triglycerides from fatty acids is to distribute them via VLDLs in the bloodstream.
However, when the balance is disturbed -- due to reasons such as excessive dietary intake, obesity, or diseases like diabetes -- and the liver synthesizes more triglycerides than it can package and release, these triglycerides accumulate in the liver and can lead to conditions like non-alcoholic fatty liver disease.
next locustBOT
Triglycerides synthesized in the liver are primarily packaged into very low-dens...
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wheat echo
How does insulin resistance lead to increased LDL and reduced HDL?
@next locust How does insulin resistance lead to increased LDL and reduced HDL?
next locustBOT
<@1082069574901563453> How does insulin resistance lead to increased LDL and red...
Insulin resistance is a state in which cells in the body do not properly respond to the hormone insulin. This can lead to a variety of metabolic disruptions, including changes in the levels of different types of cholesterol in the blood.
LDL (Low-Density Lipoprotein), often called "bad cholesterol", tends to increase under insulin resistance for several reasons:
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When cells are resistant to insulin, the hormone is less effective at inhibiting the production of very low-density lipoprotein (VLDL) in the liver. VLDL is converted in the bloodstream to LDL, so higher VLDL production leads to higher LDL levels.
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Insulin resistance tends to coincide with increased triglyceride levels. Higher levels of triglycerides can lead to the production of smaller, denser LDL particles which are more atherogenic (more likely to lead to artery-hardening plaques).
HDL (High-Density Lipoprotein), often called "good cholesterol", tends to decrease under conditions of insulin resistance due to the following reasons:
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Insulin resistance often results in higher triglyceride levels. These triglycerides are transferred to HDL in the bloodstream, leading to larger, less stable HDL particles that are more quickly removed from the bloodstream.
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The increased presence of triglycerides also stimulates the activity of an enzyme called cholesterol ester transfer protein (CETP), which transfers cholesterol from HDL to VLDL and LDL in exchange for triglycerides. This process results in a reduction of cholesterol carried by HDL.
Again, these disruptions in cholesterol levels are part of a broader metabolic syndrome associated with insulin resistance, which also includes high blood sugar levels, high blood pressure, and excess abdominal fat.
wheat echo
@next locust what are the functions of the various lipoproteins
next locustBOT
<@1082069574901563453> what are the functions of the various lipoproteins
Lipoproteins are complex particles composed of proteins and lipids. They transport lipids, like cholesterol and triglycerides, around the body because lipids are not soluble in plasma. Each type of lipoprotein has a slightly different function. Below are some of the primary types and their roles in the body:
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Chylomicrons: Chylomicrons are lipoproteins made in the intestine after you eat fat. They transport dietary lipids from the intestines to other parts of the body, such as adipose tissue and muscle, where these lipids can be used for energy or stored.
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Very Low-density Lipoproteins (VLDL): These are produced by the liver and their main function is to transport endogenously synthesized triglycerides from the liver to adipose tissue for storage or to the muscle for energy.
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Intermediate-density Lipoproteins (IDL): IDLs are formed from VLDLs. They carry a variety of fats and cholesterol around the body. They are usually quickly absorbed by the liver or converted into low-density lipoproteins.
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Low-density Lipoproteins (LDL): Often known as "bad cholesterol", LDLs transport cholesterol from the liver to the cells of the body. Cells take up LDL and use the cholesterol to build cell membranes and produce hormones. However, high levels of LDL can lead to cholesterol build-up in your arteries, increasing the risk of heart disease.
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High-density Lipoproteins (HDL): Often referred to as "good cholesterol", their main function is to transport excess cholesterol from the body's tissues back to the liver for recycling or excretion in bile. HDL also has anti-inflammatory and antioxidant effects. High levels of HDL cholesterol can lower your risk for heart disease and stroke.
Bear in mind that the balance between the different types of lipoproteins, as well as overall lipid levels, matters for cardiovascular health. Too much LDL or not enough HDL can contribute to atherosclerosis, the buildup of fats, cholesterol and other substances in and