Trying to learn a bit about food metabolism

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Trying to learn a bit about food metabolism


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Old 11-15-2011, 05:33   #1
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Default Trying to learn a bit about food metabolism

Hi Guys,

I would like to learn about Fat/Protein/Carb metabolism. I have few areas I want to understand. Please feel free to direct me to any website that you know of which explains this

1. Since we are eating fat in our diets, I want to understand how this (recently ingested fat) is processed for energy ?

2. How is stored fat (like the fat on my belly other fat reserves) processed ? For e.g. If I eat 2000 calories a day but am burning 4000 (because of excercise), the remaining calories must be coming from a stored fat reserve. How is that fat processed in for energy during and after the exercise ?

3. Does the body also store carbs and proteins for future use ?

4. How are carbs processed ? I know all carbs will ultimately become glucose and burned. So thats fairly simple. But can you enlighten me more on this ?



I understand this is going to be fairly technical, so I am ready to ready this on some scientific website, if you guys can direct me in the right direction

Tony


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Old 11-15-2011, 12:57   #2
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I am not a biologist. I am very science deficient, so take these witha grain of salt.

Quote:
1. Since we are eating fat in our diets, I want to understand how this (recently ingested fat) is processed for energy ?
Not gonna answer this one in great detail, but the simple answer is fat is stored as triglycerides - 3 fats and 1 sugar. When trigs are busted up, the fat can be used directly by the cells and the sugar gets turned into a ketone.

Quote:
2. How is stored fat (like the fat on my belly other fat reserves) processed ? For e.g. If I eat 2000 calories a day but am burning 4000 (because of excercise), the remaining calories must be coming from a stored fat reserve. How is that fat processed in for energy during and after the exercise ?
Our bodies largely run off of stored fuel. Our livers sore glucose as glycogen, and we release this store constantly throughout the day. When we eat, we release insulin whcih drives the new food into storage. Think about it, do you get a huge energy surge after you eat? No, your food is being stored, not sent to muscles.

Insulin is a storage hormone. It not only drives food into cells, but it keeps it there. Exercise all you want, but if insulin is blocking lipolisis (fat burning), you will not burn any fat. You will use up your glycogen stores tehn shut down. Marathoners experience this often at about the twenty mile mark. They pump in the fuel (gatorade type stuff) but the insulin prevents fat burning. They hit the wall.

Quote:
3. Does the body also store carbs and proteins for future use ?
Yup, see above.

Convention says 58% of protein is converted to glucose via gluconeogenesis. It may be higher in type 1's who do not make the hormone amylin which counteracts the glycogen hormone resonsible for GNG.

Quote:
4. How are carbs processed ? I know all carbs will ultimately become glucose and burned. So thats fairly simple. But can you enlighten me more on this ?
Glucose - Krebs cycle. It's converted to ATP.

Fructose isn't processed like other carbs. It gets processed in the liver and is mostly converted to palmative acid, a saturated fat. These are packaged as triglycerides and sent off to the body in VLDL packages (very low ensity lipoproteins). Once delivered, the VLDL remnants are converted in the liver by hipatic lipase into LDL particles. Consumed fat by the way is packaged in the intestines into triglycerides carried by chylomicrones, not VLDLs. These chylomicrons are not converted into LDL. Studies show that overworking this process creates smaller, more atherogenic LDL particles, and because lipid tests are based on volume, high triglycerides distort your lipid values. Yes oatmeal lowers cholesterol (LDL) readings, but it makes more cholesterol and degrades their quality.

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Old 11-15-2011, 13:43   #3
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You need a good intro to biochemistry textbook. Start there. There also are websites on various aspects of nutrition and metabolism, but they are highly variable as to content.

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Old 11-15-2011, 15:24   #4
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Quote:
Originally Posted by PowerPumper View Post
I am not a biologist. I am very science deficient, so take these witha grain of salt.

Our bodies largely run off of stored fuel. Our livers sore glucose as glycogen, and we release this store constantly throughout the day.
Thanks PP.

some clarifications

1. Is the above also true for the carbs we ingest ? I always thought that the carbs we eat are immediately converted into glucose and burned for energy ?

2. Can you explain how the stored fat (that has been stored over years) is used for energy especially when the daily calorie expenditure is more than the carbohydrate intake? Is there are cycle how the stored fat is burned to get energy

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Old 11-15-2011, 15:26   #5
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Quote:
Originally Posted by foxl View Post
You need a good intro to biochemistry textbook. Start there. There also are websites on various aspects of nutrition and metabolism, but they are highly variable as to content.
Thanks foxl !

I'll try to get hold of a book from my relative who is a doctor



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Old 11-15-2011, 16:35   #6
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Something more basic than an MD might have would be better. Try Amazon used market.

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