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  1. #1
    Veg can't get big lolwut? Mr.Runner's Avatar
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    How much glycogen can you hold?

    Before it starts being converted to fat? I know it varies based on how much muscle you have and how effective your body is at storing carbs, but can I get a ballpark estimate for how many grams of carbs the liver/muscles can store?
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    Registered User jp1390's Avatar
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    nevigsawkufelgnisaton in10city's Avatar
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    Originally Posted by Mr.Runner View Post
    Before it starts being converted to fat? I know it varies based on how much muscle you have and how effective your body is at storing carbs, but can I get a ballpark estimate for how many grams of carbs the liver/muscles can store?
    An "active" 150 lb. man can store ~2000 calories - 1600 of which are stored in the muscles as glycogen where they can be used directly; 320 calories are stored in the liver as glycogen where they can be released into the bloodstream; and 80 calories are stored in the blood as glucose and can travel to where they are needed.
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    Misc. OTO-HNS consult Dr. Horse's Avatar
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    Originally Posted by in10city View Post
    An "active" 150 lb. man can store ~2000 calories - 1600 of which are stored in the muscles as glycogen where they can be used directly; 320 calories are stored in the liver as glycogen where they can be released into the bloodstream; and 80 calories are stored in the blood as glucose and can travel to where they are needed.
    Curious to know where you got those numbers...
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    nevigsawkufelgnisaton in10city's Avatar
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    Originally Posted by Mr. Horse View Post
    Curious to know where you got those numbers...
    From text written by Edmund Burke, Ph.D.

    I don't remember the name/title off the top of my head.
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    Originally Posted by in10city View Post
    From text written by Edmund Burke, Ph.D.

    I don't remember the name/title off the top of my head.
    I was just curious, because just off the top of my head, the blood glucose calories didn't quite compute.

    Let's say blood glucose is 100mg/dL.

    Blood volume is about 5L, of which about 55% is plasma. So that's 2.75 L.

    That would make total plasma glucose content about 2.75 g. That's far short of the 80 cals number. What am I missing?
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    Registered User pologod05's Avatar
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    City, do you mean grams? because your liver can hold well more than 87 grams of carbs.

    EDIT: just double checked that, i was way off.
    Last edited by pologod05; 05-25-2008 at 01:04 PM.
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    nevigsawkufelgnisaton in10city's Avatar
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    Originally Posted by Mr. Horse View Post
    I was just curious, because just off the top of my head, the blood glucose calories didn't quite compute.

    Let's say blood glucose is 100mg/dL.

    Blood volume is about 5L, of which about 55% is plasma. So that's 2.75 L.

    That would make total plasma glucose content about 2.75 g. That's far short of the 80 cals number. What am I missing?
    That must be including from blood and extracellular space perhaps.
    It is the mark of an educated mind to be able to entertain a thought without accepting it.
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  9. #9
    Registered User littlestar's Avatar
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    It depends on the individual. Endurance athletes have higher muscle glycogen concentration compared with sedentary people. Increasing your muscle mass also increases your storage capacity for glycogen.As an example a person weighing 70kg can store 400kcal worth in the liver and 1200kcal in muscles. Average stores are approx 1600-2000kcal (400-500g) enough to last one day if you were to eat nothing

    Reference- Bean, Anita (2006) The complete Guide to Sports Nutrition
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  10. #10
    nevigsawkufelgnisaton in10city's Avatar
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    Originally Posted by pologod05 View Post
    City, do you mean grams? because your liver can hold well more than 87 grams of carbs.
    That's just an approx number (kcal) since it can be 75g or 100g (300-400 kcal).
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  11. #11
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    Originally Posted by in10city View Post
    That must be including from blood and extracellular space perhaps.
    Yeah that would make that number about right if you include total blood and ECF, assuming RBC/WBC intracellular glucose concentration is equal to serum, which to be honest, i'm not exactly sure what it is.
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