MegaSack DRAW - This year's winner is user - rgwb
We will be in touch
[i]Fat metabolism occurs all the time anyway, it's the body's preferred source of fuel. However, I thought it used some carbs to metabolise fat.[/i]
Not so convinced of that.
I believe the body will happily ask for and run on simple sugars.
Metabolising fat requires more work.
So the body asks for sugar.
This is the cycle to be corrected, to get the body to happily run on fat for all but high intensity activity.
All those graphs showing people's HR at ~ 90 percent MHR, are running on sugar, not their fat stores, as the fat can not be metabolised quickly enough.
As far as I know...
If you don't have enough sugar in your blood, during your high intensity activity, then the body scavenges the fastest carbs it can from other sources within the body ?.
While making you really, really want something sweet to eat or drink.
Sprints for deffo, ive been running like a crim for short distances, and knocked longer distances on the head, yesterday was the longest run I've done for weeks and weeks.
Be careful with this emsz, you'll get faster quickly but plateau early.
Metabolising fat requires more work.
It requires more oxygen for a given amount of energy expenditure, but if your expenditure is low (ie now I am sat at a desk) there is plenty of oxygen.
When running at 90% max HR you might be getting 40% of your calories from fat, when running at 75% you might be getting 65% from fat.
[i]When running at 90% max HR [b]you might be getting 40% of your calories from fat[/b], when running at 75% you might be getting 65% from fat.[/i]
But the fat is converted to glucose ?.
Cells don't burn fat, they [i]burn[/i] glucose, no ?.
However, if you shovel in tons of glucose, gels, energy drinks, whatever. Then the body just goes straight to them and doesn't touch the fat.
Fat is precious to the body, its worked to store it and its survival depends on it.
Furthermore, it takes every opportunity to make it and store it.
Which is why those on high sugar diets just keep getting heavier.
Which brings us back to our evolutionary past, when food wasn't as widely, abundantly, available.
As we know.
Let us also not overlook the role and effect of cortisol, when it is released. Typically when the body is under stress.
one effect of cortisol is the suppression of the immune system.
And here, some folk are reporting chest infections, etc.
Is this linked ?.
Cells don't burn fat, they burn glucose, no ?
No I think they burn adenosite triphosphate...? But I suggest if you want to be sure of this stuff then hit the library.
However, if you shovel in tons of glucose, gels, energy drinks, whatever. Then the body just goes straight to them and doesn't touch the fat.
Because of the insulin. And don't overlook the fact that shoving the gels in might result in higher overall levels of exertion and hence more calories burned 🙂
[i]Because of the insulin. And don't overlook the fact that shoving the gels in might result in higher overall levels of exertion and hence more calories burned[/i]
Yes, so like I was suggesting earlier, the body would prefer sugar for fuel ?.
But plan [i]B[/i] is to use fat.
So leading on from that.
If you eat stuff that doesn't elicit fat production via the insulin response, etc.
Food that isn't high in sugar.
Then the body is inclined to turn to metabolising its fat reserves in addition to the cals from your food.
I don't feel the craving for sugary stuff now anywhere near as much as I use to.
I believe my body has adjusted to more readily go to any stored fat for energy.
Which is what I want it to do.
I don't want to be pestered by my body for sugar all the time, and I prefer to be leaner.
iDave said he was [i]leaning out[/i] for mid Jan, IIRC.
I wonder how thats going ?.
the body would prefer sugar for fuel ?.
If you have carb stores and fat stores (as you do) then sitting at your desk you will be burning almost all fat. Your body keeps the carbs for when you need to hunt a mammoth or run away from a sabre toothed tiger.
When running at 90% max HR you might be getting 40% of your calories from fat, when running at 75% you might be getting 65% from fat.
Wiki says 5-10% from fat at 90%
35%-50% at 75%
[url] http://en.wikipedia.org/wiki/Exercise_intensity [/url]
Obviously too be taken with a pinch of salt (10% of RDA)
[i]Your body keeps the carbs [/i]
Yeap, as glycogen, in your muscles.
And removes sugar from the blood that isn't being consumed for energy at the time.
[i]for when you need to hunt a mammoth or run away from a sabre toothed tiger.[/i]
Fight or flight. But our ancestor didn't run at max HR for hours on end to avoid becoming lunch/dinner for some other beasty.
Chases didn't last that long, did they ?.
So running for hours, at very high HRs doesn't make loads of sense to me.
But I am thick, so what do I know.
🙂
[i]Obviously too be taken with a pinch of salt (10% of RDA)[/i]
😆
Chases didn't last that long, did they ?.
Jamie.
Them boys don't look like they're running too fast.
And there seems to be plenty of stopping....
Its probably a form of HIIT.
Bursts of running/sprinting with walking in between.
😉
But I am thick
You're not thick, but you really do need to do a lot more reading if you're going to take part in these threads. You've done less than me, and I know f all 🙂
Is this insulin response lark directly proportional to the amount eaten?. Im still having a little milk in coffee, so will this produce the same insulin response as say eating a loaf of white bread?. lost no weight in 1 week. but feel better for it
Broadly, yes, but there are lots of caveats.
Milk shouldn't release much insulin cos it's low GI but it does, cos of some other factor.