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    andreyy's Avatar
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    When does the body store fat?

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    We often talk of body storing excess calories as fat, but when does this process actually occur? Suppose I eat a big meal right now, will the body think it's excess calorie and store part of it as fat? Or will the body wait till the end of the day, calculate total caloric intake, and then store it? Or end of the week?

    My question is, WHEN does the body decide that the excess calories has to be stored as fat? At what point? Is it on an hourly basis? daily basis? weekly basis?

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    Most fat is stored soon after eating it. Fat is usually eaten in the form of triglycerides. If these are small, they will go to the liver, which is a different situation. Long-chain triglycerides circulate through the blood.

    The enzyme lipoprotein lipase helps triglycerides enter cells. When insulin levels are low, muscles have more lipoprotein lipase and dietary fat is directed toward muscles. When insulin levels are high, fat cells have more lipoprotein lipase and dietary fat is directed toward fat cells. Either way, it should be cleared out of the blood stream in a few hours.

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    Fat will be stored soon after entering the blood, but it can take many hours before that happens with all of it...
    "All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident."

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    Quote Originally Posted by andreyy View Post
    We often talk of body storing excess calories as fat, but when does this process actually occur? Suppose I eat a big meal right now, will the body think it's excess calorie and store part of it as fat? Or will the body wait till the end of the day, calculate total caloric intake, and then store it? Or end of the week?

    My question is, WHEN does the body decide that the excess calories has to be stored as fat? At what point? Is it on an hourly basis? daily basis? weekly basis?
    It depends on the source; once carbs convert to glucose, storage will be almost immediate. Both fat and protein will store quickly if exposed to an insulin spike from carbs eaten at the same sitting. Otherwise, they may continue to circulate until the body has used them for other purposes, or expelled excess protein or burned off the fatty acids.

    Yes, there is a mechanism for excess fat to be stored without insulin but I don't yet understand what condition invokes that, as there is a mechanism for excess fat to be burned off by the activation of BAT by cold or sleep.
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    Quote Originally Posted by Elliot View Post
    Most fat is stored soon after eating it. Fat is usually eaten in the form of triglycerides. If these are small, they will go to the liver, which is a different situation. Long-chain triglycerides circulate through the blood.

    The enzyme lipoprotein lipase helps triglycerides enter cells. When insulin levels are low, muscles have more lipoprotein lipase and dietary fat is directed toward muscles. When insulin levels are high, fat cells have more lipoprotein lipase and dietary fat is directed toward fat cells. Either way, it should be cleared out of the blood stream in a few hours.
    Quote Originally Posted by Gorbag View Post
    Fat will be stored soon after entering the blood, but it can take many hours before that happens with all of it...
    Interesting stuff. How long does it generally take afterwards for the body to start tapping back into the stored fat to use as energy?

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    Quote Originally Posted by econ View Post
    Interesting stuff. How long does it generally take afterwards for the body to start tapping back into the stored fat to use as energy?
    Depending on the ratio of insulin to glucagon, you can alternate between storage and retrieving quickly. When insulin is low, glucagon is high. It causes the release. When insulin is high, glucagon drops and you store.
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    Quote Originally Posted by John Caton View Post
    Depending on the ratio of insulin to glucagon, you can alternate between storage and retrieving quickly. When insulin is low, glucagon is high. It causes the release. When insulin is high, glucagon drops and you store.
    Not exactly. Protein raises both insulin and glucagon. Other hormones are also involved, like adrenalin.

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    Quote Originally Posted by econ View Post
    Interesting stuff. How long does it generally take afterwards for the body to start tapping back into the stored fat to use as energy?
    The body is using fat that it releases from stored adipose tissue most of the time to supply energy for the body, except around the meals where it relies more on burning off glucose from carbs. But the process to digest lots of fat can take a long time though, and there are stories about people eating huge amounts of butter before drinking that got drunk the day after because it took so long time to digest the butter so most of the alcohol stayed in the intestines until the fat was absorbed…
    "All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident."

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