Michaelangelica, on 16 August 2011 - 03:34 PM, said:
I don't think the body needs insulin to be able to use fructose.
Technically, this is correct: insulin specifically signals cell membranes to allow
glucose – not fructose, sucrose, lactose, or other carbohydrates – in the blood to enter their cells.
Before non-glucose carbohydrates can be used as energy sources in the body’s most common and important metabolic processed, they must be converted to glucose.
So, while the body can use
fructose as a major energy source, it can do so only by converting first converting it into glycogen a multi-step process that takes place almost entirely in the liver. As in the many other tissues and organs that store it, glycogen is then converted into glucose. Unlike in most cells, where the released glucose is used to do work, such as moving muscles, the liver acts like a “storage battery”, releasing most of its into the blood, to be taken up by other cells that need it. Glucose plays a major role in cells taking glucose from the blood, but effectively none in the processes that precede that.
paigetheoracle, on 31 August 2011 - 02:49 AM, said:
Well if that is the case, could it be that the virus is growing the fat to live on, turning human beings into 'domesticated herds to live off' and hitching a ride across to other human bodies via sex, touch, sneezing or however they transmigrate?
In a sense, as they can’t survive long outside our bodies, we can nearly all human viruses to be “using” us.
I think suggesting that viruses are intentionally altering our bodies to their advantage, however, falsely credits these extraordinarily simple biological machines (strictly speaking, having no metabolism of their own, viruses aren’t living organisms) with the ability to have intentions.
Viruses and simple organisms, such as some bacteria, that depend on our bodies for their survival, don’t have the brains to understand and plan, so can’t intentionally do anything. Rather, populations that adapt successfully to their environment – in this case, our bodies – survive and thrive, while those that don’t, don’t.
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By the way I'm lazy too and not particularly overweight - could this be down though to my brains use of energy as opposed to my body's lack of exercise? (Has anyone carried out a survey to find out if those people that are grossly overweight are intellectually challenged (mentally lazy) or are there fat geniuses out there too? (Suggestion based on brain using up large proportion of food intake)).
The brain does use a lot of energy – at a rate of about 100 W when very active. It uses much less energy when inactive, especially sleeping, than active, so a person who is awake and thinking intensely more than another uses more food energy. However, brain energy use doesn’t depend on the quality of the thought – stupid thinking takes as much metabolic energy as genius thinking.
Over or under weight, however, is due in cases where a person or animal has an adequate food supply, to over or under eating, because while we have limited ability to control how much use energy, we almost always have total control over how much we eat.
I’ve never read any study correlating body mass index or other over/under weight measurement to intellectual under/over achievement, and would be interested to, but I suspect that whatever the correlation or lack of one, the cause is psychological and/or perceptual (a major cause of overweight is believed to be due to the physiological misperception by people prone to it that they’re hungry even when they have eaten enough), not due to how much or how well one thinks.
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