Where does the weight actually go?

[Magrat]

There's plenty, here's one source

http://www.austincc.edu/emeyerth/krebs.htm

Thank you!

 

[Mojo]

There's plenty, here's one source

http://www.austincc.edu/emeyerth/krebs.htm

I see that that link also mentions beta oxidation, which is probably worth mentioning here. Not only does it convert fatty acids to be utilised by the Krebs cycle, but it also produces some usable energy by other means.

 

[GodMark2]

It's more often called the 'citric acid cycle' these days and is very complicated indeed. We did it in a BioSci BSc course and it was hard going. Not to be studied lightly

One aspect of weight gain/loss that intrigues me is the case of skinny people who can eat a lot without gaining weight (I'm one, it seems). We hear that they have very busy metabolisms but there's still the question of how that energy is expressed. I'm a total fidget, but it takes an awful lot of fidgeting to burn significant calories. Running a higher basal body temperature? Mine's normal. Maybe it's higher heat losses based on surface area/volume ratio?

I think the answer is what skinny people eat. Their sugar intake is very low. They eat a lot of fruit and veg.

The answer is likely at least partly how efficiently the sugars are extracted/absorbed. If your body simply passes the fuel through the digestive tract without absorbing it, you don't need to burn it off. Food like wheatgrass are nearly impossible to fully break down, whereas lemon-drops start being absorbed as soon as they hit your tongue.

 

[Magrat]

The answer is likely at least partly how efficiently the sugars are extracted/absorbed. If your body simply passes the fuel through the digestive tract without absorbing it, you don't need to burn it off. Food like wheatgrass are nearly impossible to fully break down, whereas lemon-drops start being absorbed as soon as they hit your tongue.

Upon that same line, I have celiac disease and "leaky gut". Is it true that someone like me would tend to gain weight because carbohydrates are easier to be digested than proteins? It doesn't sound right but I am an accountant, not a biologist.

 

[MuDPhuD]

Upon that same line, I have celiac disease and "leaky gut". Is it true that someone like me would tend to gain weight because carbohydrates are easier to be digested than proteins? It doesn't sound right but I am an accountant, not a biologist.

You mean this "leaky gut"?
https://en.wikipedia.org/wiki/Leaky_gut_syndrome

Weight gain is a function of resting metabolic rate, endocrine considerations, exercise, and calories consumed.

 

[Magrat]

You mean this "leaky gut"?
https://en.wikipedia.org/wiki/Leaky_gut_syndrome

Weight gain is a function of resting metabolic rate, endocrine considerations, exercise, and calories consumed.

No, I mean I have celiac disease and so much intestinal damage I don't digest food well. A side effect of this for many people is gaining weight. (I seem to be losing). I am curious why.
http://www.todaysdietitian.com/newarchives/050114p22.shtml sometimes it can be why it is diagnosed. Personally, I was in early stage renal failure.

 

[GlennB]

The answer is likely at least partly how efficiently the sugars are extracted/absorbed. If your body simply passes the fuel through the digestive tract without absorbing it, you don't need to burn it off. Food like wheatgrass are nearly impossible to fully break down, whereas lemon-drops start being absorbed as soon as they hit your tongue.

I can buy this. "Calories in" may be a somewhat superficial concept, as the calories absorbed is the critical measure. Has anyone analysed poop calorie content and maybe connected it to body weight gain/loss tendencies?

 

[deaman]

Wait......what!!!

you have to burn fat through the correct type of exercise and you may gain weight because muscle weights more than fat.

I've heard this many times but, it just struck me that one pound of muscle weighs exactly one pound, as does one pound of fat. A pound is a pound.

I think what is being expressed is that one pound of muscle takes up more volume, than fat? (Or rather, the same volume of muscle weighs more than the same volume of fat.)

Does that sound correct?

What exactly does "muscle weighs more that fat" mean?

 

[GlennB]

What exactly does "muscle weighs more that fat" mean?

By volume. By mass, I'm fairly sure they weigh the same

 

[blutoski]

By volume. By mass, I'm fairly sure they weigh the same

Old trick question from when I was a kid, yeah... "What weighs more - a ton of feathers or a ton of bricks?"

 

[blutoski]

I can buy this. "Calories in" may be a somewhat superficial concept, as the calories absorbed is the critical measure. Has anyone analysed poop calorie content and maybe connected it to body weight gain/loss tendencies?

The short answer is "sort of yes".

This is intentionally factored into calorie counts for foods on the USDA website.

Insoluble fibre has a lot of calories (wood burns), but counts as zero calories in the USDA food calorie charts because it is not available to the body.

 

[Magrat]

The short answer is "sort of yes".

This is intentionally factored into calorie counts for foods on the USDA website.

Insoluble fibre has a lot of calories (wood burns), but counts as zero calories in the USDA food calorie charts because it is not available to the body.

That's why an apple has fewer calories than apple juice, or whole grain bread has fewer calories than white bread.

 

[Ziggurat]

I would like warning before the next test sir

 

[Ziggurat]

A pound is a pound.

Not always. The Avoirdupois pound (which is what most people usually mean by "pound") is significantly different from the Troy pound (mostly used for gems and precious metals).

 

[Darwin123]

That's why an apple has fewer calories than apple juice, or whole grain bread has fewer calories than white bread.

Fewer calories per gram, not fewer calories. Or maybe it should be fewer calories per milliliter.

They have different calorie concentrations, not calories.

Unless you are Kumar!

 

[Magrat]

Fewer calories per gram, not fewer calories. Or maybe it should be fewer calories per milliliter.

They have different calorie concentrations, not calories.

Unless you are Kumar!

Lol

 

[casebro]

Obviously, the juice has been succussed !

 

[ponderingturtle]

Wouldn't people with higher usage of fuel breathe more though?

Hence people who are doing exercise get winded.

 

[ponderingturtle]

It's more often called the 'citric acid cycle' these days and is very complicated indeed. We did it in a BioSci BSc course and it was hard going. Not to be studied lightly

One aspect of weight gain/loss that intrigues me is the case of skinny people who can eat a lot without gaining weight (I'm one, it seems). We hear that they have very busy metabolisms but there's still the question of how that energy is expressed. I'm a total fidget, but it takes an awful lot of fidgeting to burn significant calories. Running a higher basal body temperature? Mine's normal. Maybe it's higher heat losses based on surface area/volume ratio?

A metabolism that is not at all good at storing excess calories? So you digest less of your food?

 

[ponderingturtle]

By volume. By mass, I'm fairly sure they weigh the same

Well only in a vacuum. A pound of helium does not weight one pound on my scale. I just put it into a balloon that I had already accounted for the weight of.