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How/when is dietary fat stored as fat?

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  • How/when is dietary fat stored as fat?



    Could someone please explain how dietary fat (IE: fat that you eat) is stored as fat in your body?


    I understand that carbs are stored as fat easily, because insulin causes excess glucose in your blood to be stored as fat in various cells.


    However, I haven't been able to find any explanation of what process(es) cause dietary fat to be stored as fat.


  • #2
    1



    http://en.wikipedia.org/wiki/Fatty_acid_metabolism


    Triglycerides break down into three glycerols (which are converted into glucose via gluconeogenesis) and one fatty acid. The glycerol components can of course be stored as adipose tissue when an excess of fat calories are consumed like any other sugar, but fatty acids break down into ketones, which are either used or excreted.


    So triacylglcerol -> three glycerols + one fatty acid -> glucose -> stored body fat

    Comment


    • #3
      1



      From Carnivore Health:

      "An enzyme called ASP (Acylation Stimulating Protein). This little jewel has the ability to directly store fat in the fat cells completely bypassing the glucose and insulin pathways.


      On a zero carb diet, excess fatty acids not immediately needed for energy will be directly stored in the fat cells through ASP. This stored fat will then be called upon as the body needs energy and is mobilized out of the fat cells through Hormone Sensitive Lipase (HSL) which will only allow body fat metabolism if insulin, a hormone, is low, hence ‘hormone sensitive’.


      As long as the total fat stored is equal to the total fat consumed, body fat will not accumulate. However, if, on average, less energy is needed than was stored, not all fat stored by ASP from the ZC meals will be remobilized by HSL and body fat will rise."


      http://www.carnivorehealth.com/main/2009/8/22/a-high-fat-diet-like-really-high-fat.html


      http://conditioningresearch.blogspot.com/2008/04/its-not-just-carbs.html


      Hope this helps!

      Comment


      • #4
        1



        Iceskater, you seem to know your stuff. Good. So people, pay attention, you CANT eat all the fat you want and not gain weight as long as youre "not eating carbs".

        Comment


        • #5
          1



          I'm not a biochemist or whatever, but I agree.

          Relying on fat for calories has benefits over being predominately reliant on carbs. A primary one is that eating more fat leads to great satiety/fullness over time, and hence, you aren't eating as many calories.

          Comment


          • #6
            1



            My take in it is that hopefully, the body will determine how much to eat. All we have to do is make the right foods available.


            If our metabolic hormones are in good working order and we learn to listen to our body, then the body will eat what it needs to achieve optimal health. A body in optimal health will express itself with an optimal weight and optimal fitness, optimal mind, optimal etc.

            “It is a truism that almost any sect, cult, or religion will legislate its creeds into law if it acquires the political power to do so, and will follow it by suppressing opposition, subverting all education to seize early the minds of the young, and by killing, locking up, or driving underground all heretics.”
            —Robert A. Heinlein

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            • #7
              1

              [quote]

              So people, pay attention, you CANT eat all the fat you want and not gain weight as long as youre "not eating carbs".
              </blockquote>


              Of course you can and many of us DO.


              Iceskater showed how fat can be stored, not that this results in fat storage. Its not &#39;fat in&#39; - &#39;fat burned&#39;.


              It is quite possible to eat an immense amount of fat and not store any body fat.


              If you have no carbs you run out of glycerol to transport and store fatty acids in adipose tissue (as the glycogen is used elsewhere). It is then impossible to store excess body fat.


              Never mind futile cycling or other metabolic changes from eating ZC.


              It is a hell of a lot more complicated than &#39;burn more fat than you eat&#39;.

              The "Seven Deadly Sins"

              • Grains (wheat/rice/oats etc) . . . . . • Dairy (milk/yogurt/butter/cheese etc) . . . . .• Nightshades (peppers/tomato/eggplant etc)
              • Tubers (potato/arrowroot etc) . . . • Modernly palatable (cashews/olives etc) . . . • Refined foods (salt/sugars etc )
              • Legumes (soy/beans/peas etc)

              Comment


              • #8
                1



                Carbohydrates promote fat storage by providing the materials (glycerol), as well as the hormonal environment (insulin) for fat storage.

                I referred to the bible, GCBC:

                "..burning glucose for fuel is an essential component in the regulation of fat metabolism-storing fat in the fat tissue"


                The more glucose consumed.."the more glycerol phosphate produced, the more fatty acids assembled into triglycerides"-ie glycerol binds 3 fatty acids into a triglyeride=fat storage.


                Also, carbohydrates elevate insulin (allowing fatty acids into the fat cells), which suppresses all other hormones that can promote fat breakdown (but can only do so "when insulin levels are low").


                So blood sugar regulates the "flow of fatty acids in and out of the fat cells."


                However, Carnivore Health points out that glucose can also come from the liver, and other factors:


                "Glucose can go sky high in an instant without any glucose or protein consumption whatsoever, even in the fasting state with whole body glucose deficit running for many hours at a time. Transient changes in insulin resistance, including hormone mediated effects on the various glucose transporter molecules, can raise blood sugar and so can increases in glycolysis in the liver. It is erroneous to infer what is happening to consumed macronutrients based on blood glucose measurements."


                I think calories DO affect fat storage, even while VLC. I think this may be from pre-existing glycogen stores, or glucogenesis from protein? (I havent done research on this point, please feel free to correct me

                Comment


                • #9
                  1



                  It is possible to store fat on ZC. It is highly unlikely that you will store excess body fat on ZC. You need to have seriously damaged part of the regulating system.


                  If you aren&#39;t restricting calories, the body reaches homeostasis and ignores excess calories. You do not get fat on ZC, even if eating excessive calories.


                  http://magicbus.myfreeforum.org/about1484.html

                  The "Seven Deadly Sins"

                  • Grains (wheat/rice/oats etc) . . . . . • Dairy (milk/yogurt/butter/cheese etc) . . . . .• Nightshades (peppers/tomato/eggplant etc)
                  • Tubers (potato/arrowroot etc) . . . • Modernly palatable (cashews/olives etc) . . . • Refined foods (salt/sugars etc )
                  • Legumes (soy/beans/peas etc)

                  Comment


                  • #10
                    1



                    http://www.dhslides.org/mgr/mgr060509f/f.htm


                    the whole thing is very interesting and only 50mins long, but click on "thumbs" and click the one which is at time interval 42:35 for more explanation about how fat is stored

                    Comment


                    • #11
                      1



                      @Tarlach read Marks post from today. what does point numer 8 says?


                      Youre confusing the point of homeostasis, when the body reaches this point, its when it only asks for the right amount of calories that it needs, its in balance, you only get hungry till you reach this balance. But you forget that most people ignore what the body is asking for, they OVEREAT because they think they can eat as much as they want, so they take advante of this, and that is NOT homeostasis. Its rare to see people eat till they are satiated, people reguarly eat till full, SPECIALLY when they think that they will not gain weight as long as they dont eat carbs. Again, read Marks post of the day, specially point number 8.

                      Comment


                      • #12
                        1



                        Where he says - "calories may need to come down"?


                        Mark isn&#39;t even game to say you have to reduce calories to lose weight. You seem to think it is the only thing that counts.


                        It isn&#39;t


                        He&#39;s also used bad examples as cheese is dairy (and stalls weight loss) and nut butter has a good dose of carbs in it (addressed in 3 and 17)


                        I see you didn&#39;t watch the excellent link that Steve posted. It&#39;s a good summary of some of the findings from GCBC.


                        Or go and read GCBC. It explains how fat is actually stored. It has nothing to do with calories.


                        Otherwise, go zero carb and eat fat until it hurts.

                        You might then understand.


                        If you even read the link I posted, you would see that dietary fat has nothing to do with body fat gain.


                        We&#39;ve seen plenty of people try to push the "it&#39;s all about calories" CW here and most now understand it&#39;s a bit more complicated than that.

                        The "Seven Deadly Sins"

                        • Grains (wheat/rice/oats etc) . . . . . • Dairy (milk/yogurt/butter/cheese etc) . . . . .• Nightshades (peppers/tomato/eggplant etc)
                        • Tubers (potato/arrowroot etc) . . . • Modernly palatable (cashews/olives etc) . . . • Refined foods (salt/sugars etc )
                        • Legumes (soy/beans/peas etc)

                        Comment


                        • #13
                          1



                          Hey ive seen the video and read the book....but why do you take what Eades says as the holy truth? there is a ton of research that says that calories do matter, but you will discard all that research and say its not true because you want to believe that youre right, you need a sense of "belonging" youre with the paleo crew.


                          Also Eades is not even a scientist, he is a journalist...i guess you knew this.

                          Comment


                          • #14
                            1



                            Also, are you counting the calories that youre eating? or because you feel like you eat a lot, you think that you must be eating above your BMR? People tend to overestimate the calories they eat when they eat low carb, because they feel full all the time and rarely feel hungry, but this is because of the fat and the low carb helping with the stabilized glucose, but you end up eating less calories without realizing.

                            Comment


                            • #15
                              1



                              Homeostasis is a two way street, if calories in goes up then metabolism goes up. If calories goes down then metabolism goes down. As long as there is no carbs to drive the accumulation of fat, then there is no accumulation of fat. The human body is not a closed system, excess fat can be and is excreted.

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