I can't wrap my head around...
- Thread starter carpee
- Start date
Grambo
Board Sponsor
The Glycemic Index is done by evaluating 50g of Carbohydrates by how they affect blood sugar. The problem is that 50g of one thing is not equal to another. Things like carrots 50g would be way more than you would eat in a sitting. There is a lot of talk about this on the net and many nutritionists are saying Glycemic Load is a better indicator.
Steveoph
NutraPlanet NinjaMonkey Rep
Funny you should mention carrots. I've eaten 5lbs in the past 3 days
I just re-discovered how great they taste with some roasted garlic and vegetable seasoning sprinkled on. Good call on the glycemic load though; that and GI should be looked at.
robotj
New member
Sara lee makes a good one, no HFCS, 100% whole wheat...good enough to eat plain. I have a whole loaf in my desk here at work.
PublicEnemy
Member
The monosaccharide in fruits is fructose... that and the third monosaccharide galactose have to be taken to the liver in order to metabolized into glucose (otherwise known as dextrose).
sethroberts
Active member
As far as I remember, fructose does not have to be converted to glucose in order to be utilized.
PublicEnemy
Member
Yes it does.
sethroberts
Active member
Thanks for the engaging discourse.
Furthermore, we do not possess an enzyme that can catalyze conversion of F-1-P to F-6-P. We must therefore split F-1-P into two 3-carbon fragments, dihydroxyacetone phosphate and glyceraldehyde. The latter is then phosphorylated at the expense of an ATP. The resulting DAP and GAP then enter glycolysis and can, in theory, enter gluconeogenesis or aerobic glycolysis.
Although DAP and GAP can be converted to glucose, it takes considerable energy to do so it is not likely since fructose in rapidly metabolized in the liver.
PublicEnemy
Member
No problem.
I think I just misunderstood your initial post. I was thinking of utilized in the context of fructose molecules being present in the bloodstream along with glucose. My apologies. And I even learned something new today!
sethroberts
Active member
Sorry for the sarcasm. Fructose can (and is) converted to glucose -- that is sure. It does not need to be though and unlike glucose does not pass through the liver into the blood stream but is metabolized quickly by the liver. The enzyme required to initiate fructose metabolism (fructokinase) is only found in the liver. Fructose is not a direct energy source for other tissues. Fructose metabolism is not controlled. It goes very quickly forward unrelated to hepatic energy utilization. This results in an increased synthesis of lipids and increased serum lipoproteins.
PublicEnemy
Member
My basic understand is that fructose is metabolized by the liver. So delving into the specifics is something I find rather interesting.
What is fructose's role in liver glycogen then? Once or if liver glycogen stores are filled then DAP and GAP are preferentially metabolized into lipoproteins with minimal impact on blood glucose?
EasyEJL
Never enough
100% whole wheat anything is always the superior choice.
ewwww no, wheat is towards the bottom of the list. Quinoa, brown rice, wild rice, oats are all far better choices. Bulgur wheat, couscous, etc. For the most part any baked goods kind of suck.
that said, man I go thru a bunch of the thomases light whole grain english muffins
no HFCS, 8g of fiber per muffin, and only 24g carbs TOTAL, so 16 net.great with some natty pb and no sugar added jellies
sethroberts
Active member
From what I read it seems that fructose is primarily matoblized to free fatty acds and secondarily to gluconeogenesis -- so it can have an impact on plasma glucose. Also, chronic consumption of fructose is a laboratory model for high cholesterol/hypertriglyceridemia due to the increase in fatty acid synthesis.
PublicEnemy
Member
It's nice to have an "ah-ha" moment as the pieces of the puzzle come together. Now I have a better scientific understanding of the health impacts of HFCS besides the fact that ingesting high GI sugars isn't necessarily the best thing for ones body.
carpee
Well-known member
ewwww no, wheat is towards the bottom of the list. Quinoa, brown rice, wild rice, oats are all far better choices. Bulgur wheat, couscous, etc. For the most part any baked goods kind of suck.
that said, man I go thru a bunch of the thomases light whole grain english muffins
great with some natty pb and no sugar added jellies
yea man, i love those. I used to have one with nat pb and a sliced up banana
redemption79
Member
Fructose is a lower GI sugar, but the peel of an apple also contains a decent amount of fiber, which lowers the GI of the fruit. Take the peel off and the GI goes up drasticaly. Watermelon, for example, is a higher GI fruit, due in part to the lack of fiber content.
EasyEJL
Never enough
The thing to think about in your complex carbs is biological anthropology - how did we evolve, what were our primary food sources through that. really "whole grains" we would have almost never eaten, other than if some happened to be in the stomach of an animal we were eating
Steveoph
NutraPlanet NinjaMonkey Rep
Well if we're being picky about fiber, a medium apple has around 4.1g of fiber, and without the skin it's only about 3.5 [Source = Dr. Joe Schwarz's Book and Apple A day... but I couldnt find the exact #'s. very close to that though)
